Journal articles: 'Vapour pressure deficit'

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Liptay, A., C. S. Tan, R. Ramsey, C. F. Drury, D. W. A. Hunt, T. Jewett, S. Weaver, and L. Woodrow. "Low vapour pressure deficits: Historical frequency and effect on tomato yield in southwestern Ontario." Canadian Journal of Plant Science 78, no. 3 (July 1, 1998): 473–75. http://dx.doi.org/10.4141/p97-121.

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An historical analysis of vapour pressure deficit was done to determine the frequency of very low vapour pressure deficits during June, July and August of the growing seasons, in Harrow, Ontario. The impetus for the analysis was a lack of yield response of processing tomatoes to fertigation in 1995 compared to other years or sites. In the historical analysis, 2 years, 1964 and 1995, were identified as having a high frequency of very low daily vapour pressure deficits during the growing season. The site of the experiment where low VPD was recorded was about 5 km north from the shore of Lake Erie. A site 27 km away from Harrow, and about 10 km north of Lake Erie, near Leamington, Ontario, had a normal, increased yield response to the fertigation treatment. Key words: Relative humidity, vapour pressure deficit, yield, tomato

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Kumari, Santosh, and H. M. Rawson H. M. Rawson. "Temperature, Vapour Pressure Deficit and Water Stress Interaction on Transpiration in Wheat." International Journal of Scientific Research 2, no. 3 (June 1, 2012): 375–76. http://dx.doi.org/10.15373/22778179/mar2013/123.

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Grossnickle, Steven C., and John H. Russell. "Gas exchange processes of yellow-cedar (Chamaecyparis nootkatensis) in response to environmental variables." Canadian Journal of Botany 69, no. 12 (December 1, 1991): 2684–91. http://dx.doi.org/10.1139/b91-337.

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Yellow-cedar (Chamaecyparis nootkatensis (D. Don) Spach) gas exchange processes were measured in response to the following primary environmental variables: photosynthetically active radiation, vapour pressure deficit, root temperature, and soil moisture. Under nonlimiting edaphic conditions, maximum stomatal conductance and maximum CO2 assimilation increased rapidly as photosynthetically active radiation increased from 0 to 200 μmol∙m−2∙s−1 and from 0 to 500 μmol∙m−2∙s−1, respectively. Thereafter, greater photosynthetically active radiation levels only resulted in minor increases in stomatal conductance and CO2 assimilation. Maximum stomatal conductance and maximum CO2 assimilation declined in a concave manner as vapour pressure deficit increased from 1 to 5 kPa. Response surface model for stomatal conductance showed vapour pressure deficit was the primary influence after light had caused initial stomatal opening. Response surface modeling approach showed CO2 assimilation increased as photosynthetically active radiation increased, but increased vapour pressure deficit resulted in a suppression of CO2 assimilation. Response surface model showed internal CO2 concentration declined sharply as photosynthetically active radiation increased from 0 to 500 μmol∙m−2∙s−1, but it remained constant with increasing vapour pressure deficit. Decreasing root temperature resulted in a continual decline in CO2 assimilation and stomatal conductance from 22 to 1 °C, while internal CO2 concentration declined from 22 to 13 °C with little change between 13 and 1 °C. As predawn shoot water potential decreased from −0.5 to −2.0 MPa, CO2 assimilation declined in a linear manner, while stomatal conductance and internal CO2 concentration declined in a concave manner. Key words: Chamaecyparis nootkatensis, CO2 assimilation, stomatal conductance, internal CO2 concentration, photosynthetically active radiation, vapour pressure deficit, root temperature, predawn shoot water potential.

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Lentzou, D., G. Xanthopoulos, C. Templalexis, and A. Kaltsa. "The transpiration and respiration as mechanisms of water loss in cold storage of figs." Food Research 5, no. 6 (December 5, 2021): 109–18. http://dx.doi.org/10.26656/fr.2017.5(6).178.

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Transpiration and respiration are two mechanisms of water loss in fresh agricultural products, resulting in visual and texture degradation. Neglecting respiration as a mechanism of water loss may lead to erroneous results at saturation where water vapour pressure deficit is zero and thus water loss is expected to be zero, however, the existence of a finite water loss is noted. In this context, an analysis of the associated with transpiration and respiration water loss in figs (Ficus carica L.) was carried out at 0oC, 10oC and 20oC and 45.64%, 80.22% and 98.65% relative humidity as well as the air conditions of walk-in cold storage rooms. The estimated transpiration rate ranged between 0.11-1.416 mg cm-2 h -1 for a water vapour pressure deficit of 0.0-0.98 kPa. The water vapour pressure deficit estimation was based on the difference between cold air temperature and figs’ surface temperature. The respiration rate was calculated at 0oC, 10oC and 20oC as 0.47±0.08, 0.94±0.11 and 2.69±0.17 mLCO2100g-1 h -1 . Quantification of the water loss showed that at 20oC and saturation, the water loss due to respiration accounts for 3.9% of the respective water loss due to water vapour pressure deficit while on average, the water loss due to respiration accounts for 1.5%, 2.1% and 2.6% of the water loss due to water vapour pressure deficit at 0oC, 10oC and 20oC.

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Wibig, Joanna, and Ewelina Krawczyk. "Zmiany wilgotności powietrza w Łodzi w latach 1966–2020 w świetle wybranych wskaźników." Prace Geograficzne, no. 170 (March 2023): 119–41. http://dx.doi.org/10.4467/20833113pg.23.002.17490.

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The aim of the study is to present changes in air humidity in central Poland in the years 1966–2000 in Łódź as an example. The values of air temperature, relative humidity and atmospheric pressure from four observation terms, 00, 06, 12 and 18 UTC, were used. On this basis, the saturated vapour pressure, the current vapour pressure, and the saturation deficit were calculated. Then, the variability of these three indicators and relative humidity was examined. The variability of monthly and seasonal average values of humidity indices in four observation periods was presented, the trends in seasonal variability of humidity indices were calculated and the distribution functions of their distributions were compared in the midday period in three 15-year periods: 1966–1980, 1986–2000 and 2006–2020. It has been shown that the pressure of saturated water vapour is the highest in summer, the lowest in winter, and slightly higher in spring than in autumn at all times, except for the night. It increased significantly in the studied period as a result of the increase in air temperature. A comparison of the distributions in three 15-year periods shows a significant increase in the probability of occurrence of high values of saturation vapour pressure, even above 30hPa. The water vapour pressure in the air is highest in summer and lowest in winter, but in spring it is lower than in autumn. All trend coefficients are positive, but only less than half are statistically significant. A comparison of the distributions over three 15-year periods show a slight increase in the probability of higher values of the actual vapour pressure. The saturation deficit, as the difference between the previous two indicators, increases significantly. Its value in spring is significantly higher than in autumn. The trend is positive, especially in spring and summer, and the comparison of distributions shows that in the last 15 years the probability of high values of saturation deficit increased significantly. The course of relative humidity is the opposite of saturation deficit. In autumn, the relative humidity is definitely higher than in spring. The trend is down. To sum up, warming brings an increase in the capacity of the atmosphere for water vapour, a slight increase in the amount of water vapour in the air, but also a significant increase in saturation deficit and a decrease in relative humidity, which is particularly strong in spring in the first half of the growing season.

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Chandiposha, Misheck, Godfrey E. Zharare, and Muntubani D. S. Nzima. "Screening of Sugarcane Varieties for Tolerance to Water Deficiency Using Containers." International Journal of Agronomy 2023 (August 23, 2023): 1–10. http://dx.doi.org/10.1155/2023/5705785.

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The negative effects of water deficiency in sugarcane production caused by climate change on the productivity of sugarcane can be mitigated by drought tolerant varieties. A 14 × 2 factorial arrangement in completely randomised design replicated three times was used to screen 14 varieties for drought tolerance at the Zimbabwe Sugar Experiment Station (ZSAES). The first factor was the sugarcane varieties viz ZN1, ZN2, ZN3, ZN4, ZN5, ZN6, ZN7, ZN8, ZN9, ZN10, CP72–1312, NCo376, N14, and CP72–2086. The second factor comprised of two levels of irrigation, namely, well-watered (100% by volume) and water-deficit stressed (30% by volume). The parameters measured in this study which included tiller count, leaf SPAD index, total plant dry mass, photosynthetic rate, and leaf temperature were found not suitable for screening sugarcane for tolerance to water-deficit stress. Water-deficit stressed varieties ZN1, ZN8, ZN10, and N14 had the tallest stalks. Varieties CP72–2086, ZN2, ZN5, CP72–1312, ZN4, ZN6, and ZN9 were stunted, indicating that they were probably drought-sensitive. Leaf vapour pressure deficits of varieties ZN8, ZN10 and N14 were higher in water-stressed plants than in the well-watered ones. The vapour pressure deficit of well-watered NCo376 plants was higher than that of water-stressed plants. Furthermore, the stomatal conductance of water-stressed NCo376 plants was greater than that of the other varieties tested, showing more tolerance to drought. Based on stem height, stomatal conductance, vapour pressure deficit, transpiration rate and dry matter parameters measured in the present study, sugarcane varieties that are recommended to cane farmers in Zimbabwe when faced with drought are NCo376, ZN1, ZN8, ZN10 and ZN14.

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Bacher, Harel, Yoav Sharaby, Harkamal Walia, and Zvi Peleg. "Modifying root-to-shoot ratio improves root water influxes in wheat under drought stress." Journal of Experimental Botany 73, no. 5 (November 16, 2021): 1643–54. http://dx.doi.org/10.1093/jxb/erab500.

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Abstract Drought intensity as experienced by plants depends upon soil moisture status and atmospheric variables such as temperature, radiation, and air vapour pressure deficit. Although the role of shoot architecture with these edaphic and atmospheric factors is well characterized, the extent to which shoot and root dynamic interactions as a continuum are controlled by genotypic variation is less well known. Here, we targeted these interactions using a wild emmer wheat introgression line (IL20) with a distinct drought-induced shift in the shoot-to-root ratio and its drought-sensitive recurrent parent Svevo. Using a gravimetric platform, we show that IL20 maintained higher root water influx and gas exchange under drought stress, which supported a greater growth. Interestingly, the advantage of IL20 in root water influx and transpiration was expressed earlier during the daily diurnal cycle under lower vapour pressure deficit and therefore supported higher transpiration efficiency. Application of a structural equation model indicates that under drought, vapour pressure deficit and radiation are antagonistic to transpiration rate, whereas the root water influx operates as a feedback for the higher atmospheric responsiveness of leaves. Collectively, our results suggest that a drought-induced shift in root-to-shoot ratio can improve plant water uptake potential in a short preferable time window during early morning when vapour pressure deficit is low and the light intensity is not a limiting factor for assimilation.

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Medrano, E., M. C. Sánchez-Guerrero, and P. Lorenzo. "INFLUENCE OF VAPOUR PRESSURE DEFICIT ON TOMATO CROP TRANSPIRATION." Acta Horticulturae, no. 614 (September 2003): 613–18. http://dx.doi.org/10.17660/actahortic.2003.614.91.

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Conaty, Warren C., James R. Mahan, James E. Neilsen, and Greg A. Constable. "Vapour pressure deficit aids the interpretation of cotton canopy temperature response to water deficit." Functional Plant Biology 41, no. 5 (2014): 535. http://dx.doi.org/10.1071/fp13223.

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Crop canopy temperature (Tc) is coupled with transpiration, which is a function of soil and atmospheric conditions and plant water status. Thus, Tc has been identified as a real-time, plant-based tool for crop water stress detection. Such plant-based methods theoretically integrate the water status of both the plant and its environment. However, previous studies have highlighted the limitations and difficulty of interpreting the Tc response to plant and soil water stress. This study investigates the links between cotton Tc, established measures of plant water relations and atmospheric vapour pressure deficit (VPDa). Concurrent measures of carbon assimilation (A), stomatal conductance (gs), leaf water potential (Ψl), soil water (fraction of transpirable soil water (FTSW)) and Tc were conducted in surface drip irrigated cotton over two growing seasons. Associations between A, gs, Ψl, FTSW and Tc are presented, which are significantly improved with the inclusion of VPDa. It was concluded that utilising the strong associations between Ψl, VPDa and Tc, an adjustment of 1.8°C for each unit of VPDa should be made to the critical Tc for irrigation. This will improve the precision of irrigation in Tc based irrigation scheduling protocols. Improved accuracy in water stress detection with Tc, and an understanding of the interaction the environment plays in this response, can potentially improve the efficiency of irrigation.

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Gholipoor, M., S. Choudhary, T. R. Sinclair, C. D. Messina, and M. Cooper. "Transpiration Response of Maize Hybrids to Atmospheric Vapour Pressure Deficit." Journal of Agronomy and Crop Science 199, no. 3 (December 7, 2012): 155–60. http://dx.doi.org/10.1111/jac.12010.

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Şahin, Mehmet, Bekir Yiğit Yıldız, Ozan Şenkal, and Vedat Peştemalci. "Estimation of the vapour pressure deficit using NOAA-AVHRR data." International Journal of Remote Sensing 34, no. 8 (January 15, 2013): 2714–29. http://dx.doi.org/10.1080/01431161.2012.750021.

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BUNCE, J. A. "Does transpiration control stomatal responses to water vapour pressure deficit?" Plant, Cell and Environment 20, no. 1 (January 1997): 131–35. http://dx.doi.org/10.1046/j.1365-3040.1997.d01-3.x.

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Gibberd, Mark R., Neil C. Turner, and Brian R. Loveys. "High vapour pressure deficit results in a rapid decline of leaf water potential and photosynthesis of carrots grown on free-draining, sandy soils." Australian Journal of Agricultural Research 51, no. 7 (2000): 839. http://dx.doi.org/10.1071/ar00037.

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Two carrot (Daucus carota L.) genotypes (Nantes and Imperator) were grown in the field on a coarse-textured, sandy soil. Experiments were conducted over 2 consecutive seasons, one providing cool growing conditions and the other much warmer growing conditions during which the vapour pressure deficit was up to 2-fold higher than in the first season. Changes in growth, soil water content, and environmental conditions were monitored for both seasons, and diurnal measurements of leaf water potential and leaf photosynthesis were taken near maturity. Frequent irrigation maintained bulk soil water content above, or near, field capacity, with the sum of rainfall and irrigation exceeding potential evaporation by 1.4- and 1.3-fold during the cool and warm seasons, respectively. Even under such well-watered conditions, a large diurnal variation in leaf water potential (1200 and 1800 kPa for the cool- and warm-season crops, respectively) was recorded. During the cool season, withholding irrigation for up to 60 h resulted in further reductions in midday leaf water potential. However, there was no effect of withholding irrigation on leaf water potential during the warm season. During both seasons, leaf photosynthetic rate of well-watered plants peaked at around 20 µmol/m2.s in the early morning (0900 hours) and then decreased throughout the day, with the magnitude of the decline associated with the prevailing vapour pressure deficit. Under well-watered conditions, leaf water potential and photosynthesis were both negatively correlated with vapour pressure deficit, for both genotypes. Leaf water potential and photosynthesis were positively correlated with each other and we conclude that a high hydraulic resistance in the plant or soil results in a vapour pressure deficit-induced reduction in leaf water potential, which in turn reduces the rate of leaf photosynthesis.

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Sheriff, DW. "Gas Exchange of Field-Grown Pinus radiata - Relationships With Foliar Nutrition and Water Potential, and With Climatic Variables." Functional Plant Biology 22, no. 6 (1995): 1015. http://dx.doi.org/10.1071/pp9951015.

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Gas exchange measurements were conducted on Pinus radiata to investigate relationships between these and leaf-air vapour pressure deficit, photosynthetic photon flux density, and foliar temperature, water potential and nutrition in the field. Multiple non-linear regressions indicated strong relationships between gas exchange and foliar [P] (but of no other nutrient), leaf-air vapour pressure deficit, photosynthetic photon flux density, foliar water potential and temperature. The final regression produced for relationships between gas exchange and these variables explained 81% of the variance in the data. Micro-climate and foliar data from another site were used to predict gas exchange using the regressions and calculated parameters. Good agreement was obtained between the predicted values and carbon assimilation measured at that site. The relationship was poorer for leaf conductance.

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Wang, Enli, Chris J. Smith, Warren J. Bond, and Kirsten Verburg. "Estimations of vapour pressure deficit and crop water demand in APSIM and their implications for prediction of crop yield, water use, and deep drainage." Australian Journal of Agricultural Research 55, no. 12 (2004): 1227. http://dx.doi.org/10.1071/ar03216.

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Vapour pressure deficit (VPD) has a significant effect on the amount of water required by the crop to maintain optimal growth. Data required to calculate the mean VPD on a daily basis are rarely available, and most models use approximations to estimate it. In APSIM (Agricultural Production Systems Simulator), VPD is estimated from daily maximum and minimum temperatures with the assumption that the minimum temperature equals dew point, and there is little change in vapour pressure or dew point during any one day. The accuracy of such VPD estimations was assessed using data collected every 15 min near Wagga Wagga in New South Wales, Australia. Actual vapour pressure of the air ranged from 0.5 to 2.5 kPa. For more than 75% of the time its variation was less than 20%, and the maximum variation was up to 50%. Daytime mean VPD ranged from 0 to 5.3 kPa. Daily minimum temperature was found to be a poor estimate of dew point temperature, being higher than dew point in summer and lower in winter. Thus the prediction of vapour pressure was poor. Vapour pressure at 0900 hours was a better estimate of daily mean vapour pressure. Despite the poor estimation of vapour pressure, daytime mean VPD was predicted reasonably well using daily maximum and minimum temperatures. If the vapour pressure at 0900 hours from the SILO Patched Point Dataset was used as the actual daily mean vapour pressure, the accuracy of daytime VPD estimation was further improved. Simulations using historical weather data for 1957–2002 show that such improved accuracy in daytime VPD estimation slightly increased simulated crop yield and deep drainage, while slightly reducing crop water uptake. Comparison of the APSIM RUE/TE and CERES-Wheat approaches for modelling potential transpiration revealed differences in crop water demand estimated by the two approaches. Although the differences had a small effect on the probability distribution of simulated long-term wheat yield, water uptake, and deep drainage, this finding highlights the need for a scientific re-appraisal of the APSIM RUE/TE and energy balance approaches for the estimation of crop demand, which will have implications for modelling crop growth under water-limited conditions and calculation of water required to maintain maximum growth.

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Atay, E., B. Hucbourg, A. Drevet, and P. É. Lauri. "Growth responses to water stress and vapour pressure deficit in nectarine." Acta Horticulturae, no. 1139 (August 2016): 353–58. http://dx.doi.org/10.17660/actahortic.2016.1139.61.

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SHRESTHA, RAM K. "Effect of vapour pressure deficit on iron exclusion in rice genotypes." INTERNATIONAL JOURNAL OF PLANT SCIENCES 10, no. 2 (July 15, 2015): 168–70. http://dx.doi.org/10.15740/has/ijps/10.2/168-170.

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Mielke, Marcelo Schramm, Alex-Alan Furtado de Almeida, and Fábio Pinto Gomes. "Photosynthetic traits of five neotropical rainforest tree species: interactions between light response curves and leaf-to-air vapour pressure deficit." Brazilian Archives of Biology and Technology 48, no. 5 (September 2005): 815–24. http://dx.doi.org/10.1590/s1516-89132005000600018.

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Measurements of leaf gas exchange at different photosynthetic photon flux density (PPFD) levels were conducted in order to compare the photosynthetic traits of five neotropical rainforest tree species, with a special emphasis on empirical mathematical models to estimate the light response curve parameters incorporating the effects of leaf-to-air vapour pressure deficit (D) on the saturated photosynthetic rate (Amax). All empirical mathematical models seemed to provide a good estimation of the light response parameters. Comparisons of the leaf photosynthetic traits between different species needed to select an appropriate model and indicated the microenvironmental conditions when the data were collected. When the vapour pressure deficit inside the chamber was not controlled, the incorporation of linear or exponencial functions that explained the effects of D on leaf gas exchange, was a very good method to enhance the performance of the models.

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Filho, J. P. Lemos, and C. V. Mendonça Filho. "Seasonal changes in the water status of three woody legumes from the Atlantic forest, Caratinga, Brazil." Journal of Tropical Ecology 16, no. 1 (January 2000): 21–32. http://dx.doi.org/10.1017/s0266467400001243.

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The Atlantic forest of Brazil is considered to be a high priority for conservation in South America. Despite its importance, few phenological and ecophysiological data are available for plants of this area. In this study the seasonal changes in the water potentials (Ψ) and the phenological behaviour of three woody legumes are related to environmental conditions, particularly air vapour pressure deficit (VPD). The values of Ψ at predawn were greater than −0.75 MPa for all species even during the dry season (May–September). The minimal daily value of Ψ was −3.8 MPa. The maximum daily amplitude of Ψ (Δ parameter) was correlated with the air vapour pressure deficit, showing high correlation coefficients in linear equations. A high recovery rate of Ψ after rain (greater than 0.80) was registered for all species, suggesting a high hydraulic conductivity. The high values of Ψ at predawn during the year and the strong relationship between the daily amplitude of Ψ and VPD suggested that the changes in the canopy cover are related more to atmospheric drought than to soil water deficit.

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Collins, Marisa J., Sigfredo Fuentes, and Edward W. R. Barlow. "Partial rootzone drying and deficit irrigation increase stomatal sensitivity to vapour pressure deficit in anisohydric grapevines." Functional Plant Biology 37, no. 2 (2010): 128. http://dx.doi.org/10.1071/fp09175.

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The aim of this study was to investigate how alternative irrigation strategies affected grapevine (Vitis vinifera L.) stomatal response to atmospheric vapour pressure deficit (VPD). In two sites, application of partial rootzone drying (PRD) at 90–100% of crop evapotranspiration (ETc) increased stomatal sensitivity of Shiraz (Syrah) grapevines to high VPD compared with control vines irrigated with the same amount of water but applied on both sides of the vine. PRD significantly reduced vine water use (ESF) measured as sap flow and in dry conditions increased the depth of water uptake from the soil profile. In both experiments, PRD reduced vine water use by up to 50% at moderate VPD (~3 kPa) compared with control vines irrigated at the same level. In the same vines, the response to PRD applied at 100% ETc and deficit irrigation applied at 65% ETc was the same, increasing stomatal sensitivity to VPD and decreasing sap flow. Hydraulic signalling apparently did not play a role in changing stomatal sensitivity as there was no difference in stem water potentials between any of the treatment (PRD and DI) and control vines. This suggests that a long distance root-based chemical signal such as ABA may be responsible for the changes in stomatal behaviour. Shiraz grapevines have previously been classified as anisohydric-like, but application of PRD and DI increased stomatal closure in response to conditions of high evaporative demand making the vines behave in a more isohydric-like manner.

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Matsoukas, C., N. Benas, N. Hatzianastassiou, K. G. Pavlakis, M. Kanakidou, and I. Vardavas. "Potential evaporation trends over land between 1983–2008: driven by radiative fluxes or vapour-pressure deficit?" Atmospheric Chemistry and Physics 11, no. 15 (August 1, 2011): 7601–16. http://dx.doi.org/10.5194/acp-11-7601-2011.

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Abstract. We model the Penman potential evaporation (PE) over all land areas of the globe for the 25-yr period 1983–2008, relying on radiation transfer models (RTMs) for the shortwave and longwave fluxes. Penman's PE is determined by two factors: available energy for evaporation and ground to atmosphere vapour transfer. Input to the PE model and RTMs comprises satellite cloud and aerosol data, as well as data from reanalyses. PE is closely linked to pan evaporation, whose trends have sparked controversy in the community, since the factors responsible for the observed pan evaporation trends are not determined with consensus. Our particular interest is the temporal evolution of PE, and the provided insight to the observed trends of pan evaporation. We examine the decadal trends of PE and various related physical quantities, such as net solar flux, net longwave flux, water vapour saturation deficit and wind speed. Our findings are the following: Global warming has led to a larger water vapour saturation deficit. The periods 1983–1989, 1990–1999, and 2000–2008 were characterised by decreasing, increasing, and slightly decreasing PE, respectively. In these last 25 yr, global dimming/brightening cycles generally increased the available energy for evaporation. PE trends seem to follow more closely the trends of energy availability than the trends of the atmospheric capability for vapour transfer, at most locations on the globe, with trends in the Northern hemisphere significantly larger than in the Southern. These results support the hypothesis that global potential evaporation trends are attributed primarily to secular changes in the radiation fluxes, and secondarily to vapour transfer considerations.

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Gordon, R., D. M. Brown, A. Madani, and M. A. Dixon. "An assessment of potato sap flow as affected by soil water status, solar radiation and vapour pressure deficit." Canadian Journal of Soil Science 79, no. 2 (May 1, 1999): 245–53. http://dx.doi.org/10.4141/s97-079.

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Water-use of three field-grown potato cultivars (Atlantic, Monona and Norchip) was examined using a commercially available sap flow monitoring system over three consecutive growing seasons. The objectives of the investigation were to utilize the sap flow system to assess the water use of three field-grown potato cultivars. This included an assessment of the relationship between environmental conditions, water status and measured sap flow including the plant-to-plant variation in sap flow and an evaluation of relative transpiration in relation to the soil water status.Each cultivar maintained daily sap flow close to the atmospheric potential transpiration until approximately 70% of the available water was depleted. Under conditions where the soil was drier (>70% depleted), Monona potato plants exhibited a more rapid decline in transpiration than Norchip and Atlantic.Hourly sap flow rates were closely related to solar irradiance, especially under well-watered conditions, with no apparent light saturation point. Vapour pressure deficit effects on sap flow were less pronounced, although maximum vapour pressure deficits encountered were only 2 kPa. Key words: Water use, sap flow, transpiration, potato

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Tesfuhuney, Weldemichael A., Sue Walker, Leon D. Van Rensburg, and A. Stephan Steyn. "Micrometeorological measurements and vapour pressure deficit relations under in-field rainwater harvesting." Physics and Chemistry of the Earth, Parts A/B/C 94 (August 2016): 196–206. http://dx.doi.org/10.1016/j.pce.2016.03.001.

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Leonardi, Cherubino, Soraya Guichard, and Nadia Bertin. "High vapour pressure deficit influences growth, transpiration and quality of tomato fruits." Scientia Horticulturae 84, no. 3-4 (June 2000): 285–96. http://dx.doi.org/10.1016/s0304-4238(99)00127-2.

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GARDINGEN, PAUL R. VAN, and JOHN GRACE. "Vapour Pressure Deficit Response of Cuticular Conductance in Intact Leaves ofFagus sylvaticaL." Journal of Experimental Botany 43, no. 10 (1992): 1293–99. http://dx.doi.org/10.1093/jxb/43.10.1293.

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Maroco, João P., João S. Pereira, and M. Manuela Chaves. "Stomatal Responses to Leaf-to-Air Vapour Pressure Deficit in Sahelian Species." Functional Plant Biology 24, no. 3 (1997): 381. http://dx.doi.org/10.1071/pp96062.

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Stomatal response to leaf-to-air vapour pressure deficit (LAVPD) was studied in the annual arid zone C4 grasses Schoenefeldia gracilis, Dactyloctenium aegyptium and Eragrostis tremula and in the C3 species, convolvulus, Ipomoea pes-tigridis and Ipomoea vagans. Stomatal responses to LAVPD were consistent with the drought survival strategies adopted by the different species. In drought resistant species (S. gracilis, I. vagansand I. pes-tigridis) stomatal conductance showed a negative response to increasing LAVPD whereas, in drought escaping species (D. aegyptium and E. tremula), stomatal conductance was independent of LAVPD. These observations suggest that resistance to drought was associated with stomatal closure as LAVPD increased, thus reducing the negative effect of a higher evaporative demand on water use efficiency, whereas in drought escaping species stomata showed no response to increasing evaporative demand in the atmosphere.

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Yang, Zongjian, Thomas R. Sinclair, Maggie Zhu, Carlos D. Messina, Mark Cooper, and Graeme L. Hammer. "Temperature effect on transpiration response of maize plants to vapour pressure deficit." Environmental and Experimental Botany 78 (May 2012): 157–62. http://dx.doi.org/10.1016/j.envexpbot.2011.12.034.

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Turney, Chris S. M., James Barringer, John E. Hunt, and Matt S. McGlone. "Estimating past leaf-to-air vapour pressure deficit from terrestrial plant δ13C." Journal of Quaternary Science 14, no. 5 (August 1999): 437–42. http://dx.doi.org/10.1002/(sici)1099-1417(199908)14:5<437::aid-jqs458>3.0.co;2-z.

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Olivo, Natalia, Joan Girona, and Jordi Marsal. "Seasonal sensitivity of stem water potential to vapour pressure deficit in grapevine." Irrigation Science 27, no. 2 (September 17, 2008): 175–82. http://dx.doi.org/10.1007/s00271-008-0134-z.

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Yu, Xuemei, Luqi Niu, Yuhui Zhang, Zijian Xu, Junwei Zhang, Shuhui Zhang, and Jianming Li. "Vapour pressure deficit affects crop water productivity, yield, and quality in tomatoes." Agricultural Water Management 299 (June 2024): 108879. http://dx.doi.org/10.1016/j.agwat.2024.108879.

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Rifai, Sami W., Cécile A. J. Girardin, Erika Berenguer, Jhon del Aguila-Pasquel, Cecilia A. L. Dahlsjö, Christopher E. Doughty, Kathryn J. Jeffery, et al. "ENSO Drives interannual variation of forest woody growth across the tropics." Philosophical Transactions of the Royal Society B: Biological Sciences 373, no. 1760 (October 8, 2018): 20170410. http://dx.doi.org/10.1098/rstb.2017.0410.

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Meteorological extreme events such as El Niño events are expected to affect tropical forest net primary production (NPP) and woody growth, but there has been no large-scale empirical validation of this expectation. We collected a large high–temporal resolution dataset (for 1–13 years depending upon location) of more than 172 000 stem growth measurements using dendrometer bands from across 14 regions spanning Amazonia, Africa and Borneo in order to test how much month-to-month variation in stand-level woody growth of adult tree stems (NPP stem ) can be explained by seasonal variation and interannual meteorological anomalies. A key finding is that woody growth responds differently to meteorological variation between tropical forests with a dry season (where monthly rainfall is less than 100 mm), and aseasonal wet forests lacking a consistent dry season. In seasonal tropical forests, a high degree of variation in woody growth can be predicted from seasonal variation in temperature, vapour pressure deficit, in addition to anomalies of soil water deficit and shortwave radiation. The variation of aseasonal wet forest woody growth is best predicted by the anomalies of vapour pressure deficit, water deficit and shortwave radiation. In total, we predict the total live woody production of the global tropical forest biome to be 2.16 Pg C yr −1 , with an interannual range 1.96–2.26 Pg C yr −1 between 1996–2016, and with the sharpest declines during the strong El Niño events of 1997/8 and 2015/6. There is high geographical variation in hotspots of El Niño–associated impacts, with weak impacts in Africa, and strongly negative impacts in parts of Southeast Asia and extensive regions across central and eastern Amazonia. Overall, there is high correlation ( r = −0.75) between the annual anomaly of tropical forest woody growth and the annual mean of the El Niño 3.4 index, driven mainly by strong correlations with anomalies of soil water deficit, vapour pressure deficit and shortwave radiation. This article is part of the discussion meeting issue ‘The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications’.

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Eto, E. C., P. C. Withers, and C. E. Cooper. "Can birds do it too? Evidence for convergence in evaporative water loss regulation for birds and mammals." Proceedings of the Royal Society B: Biological Sciences 284, no. 1867 (November 15, 2017): 20171478. http://dx.doi.org/10.1098/rspb.2017.1478.

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Birds have many physiological characteristics that are convergent with mammals. In the light of recent evidence that mammals can maintain a constant insensible evaporative water loss (EWL) over a range of perturbing environmental conditions, we hypothesized that birds might also regulate insensible EWL, reflecting this convergence. We found that budgerigars ( Melopsittacus undulatus ) maintain EWL constant over a range of relative humidities at three ambient temperatures. EWL, expressed as a function of water vapour pressure deficit, differed from a physical model where the water vapour pressure deficit between the animal and the ambient air is the driver of evaporation, indicating physiological control of EWL. Regulating EWL avoids thermoregulatory impacts of varied evaporative heat loss; changes in relative humidity had no effect on body temperature, metabolic rate or thermal conductance. Our findings that a small bird can regulate EWL are evidence that this is a common feature of convergently endothermic birds and mammals, and may therefore be a fundamental characteristic of endothermy.

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WRIGHT, JONATHAN C., and JOHN MACHIN. "Water vapour absorption in terrestrial isopods." Journal of Experimental Biology 154, no. 1 (November 1, 1990): 13–30. http://dx.doi.org/10.1242/jeb.154.1.13.

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Continuous and intermittent gravimetric measurements have identified active water vapour absorption (WVA) in three species of terrestrial Isopoda. Water activity thresholds for uptake lie in the range 0.92-0.95. Above the threshold, WVA shows non-saturated kinetics; the rectum apparently serves as a supplementary avenue for fluid resorption during rapid uptake. Standardized uptake fluxes, corrected for vapour pressure deficit, can be varied, allowing animals to balance water losses accurately over long periods. Blocking experiments have localised the ventral pleon as the uptake site. The pleopods display ventilatory cycling during WVA. Cycle frequency increases with humidity, compensating for changes in activity deficit between uptake fluid and air, and allowing uptake rate to be maximised. Freezing-point depression studies reveal hyperosmotic fluid in the ventral pleon. Osmolalities are compatible with prior uptake rates of the specimens studied. WVA would allow terrestrial isopods to regulate their water balance in external activities below the haemolymph activity (approximately 0.99) and above the uptake threshold. Liquid water - an alternative source for hydration - is rapidly absorbed across the hydrophilic cuticle, posing severe danger of drowning.

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Livingston, N. J., and T. A. Black. "Stomatal characteristics and transpiration of three species of conifer seedlings planted on a high elevation south-facing clear-cut." Canadian Journal of Forest Research 17, no. 10 (October 1, 1987): 1273–82. http://dx.doi.org/10.1139/x87-197.

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Douglas-fir (Pseudotsugamenziessi (Mirb.) Franco), western hemlock (Tsugaheterophylla (Raf.) Sarg.), and Pacific silver fir (Abiesamabalis (Doug.) Forbes) seedlings were planted in the spring as 1-0 container-grown plugs on a south-facing high elevation clear-cut located on Mount Arrowsmith, Vancouver Island, British Columbia, and their stomatal responses to environmental and physiological variables were determined over two successive growing seasons. The stomatal responses of all three species to changes in environmental variables and time did not differ over the 2 years nor were there differences in response between seedlings planted a year apart. A simple multiplicative boundary-line model that related seedling stomatal conductance (gs) to measurements of hourly average solar irradiance, air temperature, vapour pressure deficit, and average root zone soil water potential accounted for over 70% of the variability in gs. When the number of hours from sunrise was included as an independent variable, over 85% of the variability in gs could be explained. Daily seedlings transpiration rates on a projected leaf area basis were successfully estimated by summing the product of the calculated average gs and D/(RvT′) where D is the vapour pressure deficit, Rv is the gas constant for water vapour, and T′ is the absolute air temperature.

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Zhang, Hehui, and PS Nobel. "Dependency of cI/ca and Leaf Transpiration Efficiency on the Vapour Pressure Deficit." Functional Plant Biology 23, no. 5 (1996): 561. http://dx.doi.org/10.1071/pp9960561.

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The leaf transpiration efficiency (A/E, where A is the assimilation rate and E the transpiration rate) is widely used to evaluate plant responses to the environment, yet little attention has been paid to its relationship with vapour pressure deficit (D), the driving force for E. The proposed model is based on the increasingly recognised linear relationship between the ratio of intercellular to ambient CO2 partial pressures (cI/ca) and D. Unlike previous models for A/E, the proposed model does not assume that the leaf and air temperatures are the same or that ci/ca is constant. A/E predicted by the model agreed with that measured for the C3 Encelia farinosa and the C4 Pleuraphis rigida, common species in the north-westem Sonoran Desert, based on gas exchange measured in the field and in environmental chambers. The dependency of cI/ca and A/E on D was additionally evaluated using published data for five other C3 species and two other C4 species. Generally, ci/ca was more sensitive to changes in D for the C4 species than the C3 species. The predictions for A/E by the model were also compared with predictions using a constant ci/ca, either a general cI/ca (0.7 for C3 and 0.3 for C4) or a species-dependent mean cI/ca. Overall, the proposed model performed best for both the C3 and C4 species; using the general cI/ca always resulted in an over-prediction of A/E.

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Sellin, A. "The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water status." Annales Geophysicae 16, no. 4 (April 30, 1998): 470–76. http://dx.doi.org/10.1007/s00585-998-0470-6.

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Abstract. Where there is sufficient water storage in the soil the water potential (Ψx) in shoots of Norway spruce [Picea abies (L.) Karst.] is strongly governed by the vapour pressure deficit of the atmosphere, while the mean minimum values of Ψx usually do not drop below –1.5 MPa under meteorological conditions in Estonia. If the base water potential (Ψb) is above –0.62 MPa, the principal factor causing water deficiency in shoots of P. abies may be either limited soil water reserves or atmospheric evaporative demand depending on the current level of the vapour pressure deficit. As the soil dries the stomatal control becomes more efficient in preventing water losses from the foliage, and the leaf water status, in turn, less sensitive to atmospheric demand. Under drought conditions, if Ψb falls below –0.62 MPa, the trees' water stress is mainly caused by low soil water availability. Further declines in the shoot water potential (below –1.5 MPa) can be attributed primarily to further decreases in the soil water, i.e. to the static water stress.Key words. Hydrology (evapotranspiration · plant ecology · soil moisture).

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Flo, Victor, Jordi Martínez-Vilalta, Víctor Granda, Maurizio Mencuccini, and Rafael Poyatos. "Vapour pressure deficit is the main driver of tree canopy conductance across biomes." Agricultural and Forest Meteorology 322 (July 2022): 109029. http://dx.doi.org/10.1016/j.agrformet.2022.109029.

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38

Lihavainen, Jenna, Viivi Ahonen, Sarita Keski-Saari, Sari Kontunen-Soppela, Elina Oksanen, and Markku Keinänen. "Low vapour pressure deficit affects nitrogen nutrition and foliar metabolites in silver birch." Journal of Experimental Botany 67, no. 14 (June 3, 2016): 4353–65. http://dx.doi.org/10.1093/jxb/erw218.

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39

Amitrano, Chiara, Carmen Arena, Youssef Rouphael, Stefania De Pascale, and Veronica De Micco. "Vapour pressure deficit: The hidden driver behind plant morphofunctional traits in controlled environments." Annals of Applied Biology 175, no. 3 (September 3, 2019): 313–25. http://dx.doi.org/10.1111/aab.12544.

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RAO, K. N., C. R. V. RAMAN, and S. JAYANTHI. "Relationship between evaporation and other , meteorological factors." MAUSAM 23, no. 3 (February 3, 2022): 327–34. http://dx.doi.org/10.54302/mausam.v23i3.5284.

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Using correlation techniques, an assessment is made of the influence exerted by basic meteorological factors in controlling .the evoporative power of air. Linear regression equations are developed for twenty five stations linking pan evaporation with saturation vapour pressure deficit, maximum temperature and mean daily wind speed. Evaporation computed with formulation thus developed compares favourably with actual data.

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Li, Zhiheng, Yiping Zhang, Shusen Wang, Guofu Yuan, Yan Yang, Guiri Yu, and Xiaomin Sun. "Evaluating the models of stomatal conductance response to humidity in a tropical rain forest of Xishuangbanna, southwest China." Hydrology Research 42, no. 4 (August 1, 2011): 307–17. http://dx.doi.org/10.2166/nh.2011.144.

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The ecosystem-level fluxes of water vapour and carbon dioxide were measured from 2003 to 2006 at a tropical rain forest in Xishuangbanna, southwest China, using the eddy covariance (EC) technique. These flux measurements allowed the canopy-level evaluation of stomatal conductance (g) response to humidity models. The results showed that both the BWB model and the Leuning model discussed here underestimated g at high humidity and overestimated g at the mid-to-low range of humidity. In contrast, the Wang models discussed here (model-ha and model-Da) perfectly described the relationship of g response to humidity. The model comparison results also demonstrated high consistency over all the observation years. The good performance of the Wang model-ha and model-Da indicated that stomatal conductance responds more sensitively to humidity deficit or water vapour pressure deficit than to relative humidity itself at canopy level.

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Zhang, B. C., J. J. Cao, Y. F. Bai, S. J. Yang, L. Hu, and Z. G. Ning. "Effects of cloudiness on carbon dioxide exchange over an irrigated maize cropland in northwestern China." Biogeosciences Discussions 8, no. 1 (February 23, 2011): 1669–91. http://dx.doi.org/10.5194/bgd-8-1669-2011.

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Abstract. Clouds can strongly influence solar radiation and affects other microclimatic factors (such as air temperature and vapour pressure deficit), and those changed environmental conditions may exert strong effects on carbon exchange between terrestrial ecosystems and the atmosphere. In this study, we analyzed how canopy photosynthesis and ecosystem respiration respond to changes in cloudy conditions, based on two years of eddy-covariance and meteorological data from an irrigated maize cropland in Yingke oasis of northwestern China. The results showed that net carbon uptake was more negative under cloudy than under clear conditions, it indicates that net carbon uptake increased under cloudy days. The rate of ecosystem respiration (Re) decreased under cloudy conditions due to decreased air temperature. However, photosynthesis was suppressed by the decreasing air temperature and vapour pressure deficit (VPD) under cloudy skies. Thus, the enhancement of net carbon uptake under cloudy skies mainly contributed from increasing photosynthesis with diffuse radiation. Those results improve our understanding of the effects of cloud cover on carbon exchange process in maize (C4) cropland, and improve our understanding of the driver improving net carbon uptake under cloudy conditions.

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Suwarman, Rusmawan, I. Dewa Gede Agung Junnaedhi, and Novitasari Novitasari. "A Study on Characteristics and Comparison of Evaporation Estimation Methods in Bandung." Journal of Mathematical and Fundamental Sciences 53, no. 2 (August 24, 2021): 182–99. http://dx.doi.org/10.5614/j.fund.math.sci.2021.53.2.2.

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This study aims to understand the characteristic of evaporation and to evaluate the evaporation estimation methods to be employed in Bandung by using observation data at three different land cover characteristics sites, namely, densely vegetated area (Baleendah), densely built-up area (Ujung Berung), and mix of buildings and vegetation area (ITB). Observation data used are hourly evaporation, vapour pressure deficit, temperature, relative humidity, wind speed, and radiation. The analysis was done mostly by using statistical methods such as regression analysis and error comparison. The result shows the dominant weather factor affecting the evaporation in ITB and Ujung Berung is vapour pressure deficit, and in Baleendah is solar radiation. The methods of evaporation estimations used in this study are Trabert, Schendel, Turc, and CIMIS-Penman methods. The result shows that the original constant values of those methods are significantly correlated. However, the Schendel is found the most overestimated, and the second is Turc. The best estimated evaporation in Baleendah, ITB, and Ujung Berung is calculated using CIMIS-Penman with one hour lag of radiation, Trabert, and Calibrated Schendel, respectively. The improvement of constant value was applied to Schendel and the result is better than the original constants.

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Suwarman, Rusmawan, Novitasari Novitasari, and I. Dewa Gede Agung Junnaedhi. "A Study on Characteristics and Comparison of Evaporation Estimation Methods in Bandung." Journal of Mathematical and Fundamental Sciences 53, no. 2 (August 24, 2021): 182–99. http://dx.doi.org/10.5614/j.math.fund.sci.2021.53.2.2.

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This study aims to understand the characteristic of evaporation and to evaluate the evaporation estimation methods to be employed in Bandung by using observation data at three different land cover characteristics sites, namely, densely vegetated area (Baleendah), densely built-up area (Ujung Berung), and mix of buildings and vegetation area (ITB). Observation data used are hourly evaporation, vapour pressure deficit, temperature, relative humidity, wind speed, and radiation. The analysis was done mostly by using statistical methods such as regression analysis and error comparison. The result shows the dominant weather factor affecting the evaporation in ITB and Ujung Berung is vapour pressure deficit, and in Baleendah is solar radiation. The methods of evaporation estimations used in this study are Trabert, Schendel, Turc, and CIMIS-Penman methods. The result shows that the original constant values of those methods are significantly correlated. However, the Schendel is found the most overestimated, and the second is Turc. The best estimated evaporation in Baleendah, ITB, and Ujung Berung is calculated using CIMIS-Penman with one hour lag of radiation, Trabert, and Calibrated Schendel, respectively. The improvement of constant value was applied to Schendel and the result is better than the original constants.

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Batke, Sven Peter, and Daniel Lucius Kelly. "Tree damage and microclimate of forest canopies along a hurricane-impact gradient in Cusuco National Park, Honduras." Journal of Tropical Ecology 30, no. 5 (June 20, 2014): 457–67. http://dx.doi.org/10.1017/s0266467414000315.

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Abstract:Past studies of large, infrequent wind disturbances have shown that topographical, biological and meteorological factors interact to create complex damage patterns to forest ecosystems. However, the extent to which some of these factors change the forest microclimate along a vertical forest profile is poorly known. In a previous study, we correlated tree damage with a hurricane model that estimated past hurricane impacts within Cusuco National Park, Honduras over a 15-y period. Here we use the model to compare physical tree damage among different species in ten 150 ×150-m plots and to correlate modelled exposure of hurricanes to microclimate measurements along the vertical canopy over a 12-mo period. It was found that past hurricane impacts could still be detected long after the events. Different tree species showed different levels of wind damage. Most branch damage was observed on conifers (Pinus spp.), followed by angiosperm species. Vapour pressure deficit increased with height in the canopy and with increased disturbance level. A linear model explained 83% of the total variance in vapour pressure deficit, with 67% attributed to monthly fluctuation, 15% to altitude, 12% to historical hurricane damage and 6% to height in the canopy.

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Israel, David, Shanjida Khan, Charles R. Warren, Janusz J. Zwiazek, and T. Matthew Robson. "The contribution of PIP2-type aquaporins to photosynthetic response to increased vapour pressure deficit." Journal of Experimental Botany 72, no. 13 (April 30, 2021): 5066–78. http://dx.doi.org/10.1093/jxb/erab187.

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Abstract The roles of different plasma membrane aquaporins (PIPs) in leaf-level gas exchange of Arabidopsis thaliana were examined using knockout mutants. Since multiple Arabidopsis PIPs are implicated in CO2 transport across cell membranes, we focused on identifying the effects of the knockout mutations on photosynthesis, and whether they are mediated through the control of stomatal conductance of water vapour (gs), mesophyll conductance of CO2 (gm), or both. We grew Arabidopsis plants in low and high humidity environments and found that the contribution of PIPs to gs was larger under low air humidity when the evaporative demand was high, whereas any effect of a lack of PIP function was minimal under higher humidity. The pip2;4 knockout mutant had 44% higher gs than wild-type plants under low humidity, which in turn resulted in an increased net photosynthetic rate (Anet). We also observed a 23% increase in whole-plant transpiration (E) for this knockout mutant. The lack of functional plasma membrane aquaporin AtPIP2;5 did not affect gs or E, but resulted in homeostasis of gm despite changes in humidity, indicating a possible role in regulating CO2 membrane permeability. CO2 transport measurements in yeast expressing AtPIP2;5 confirmed that this aquaporin is indeed permeable to CO2.

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Bourne, A. E., A. M. Haigh, and D. S. Ellsworth. "Stomatal sensitivity to vapour pressure deficit relates to climate of origin in Eucalyptus species." Tree Physiology 35, no. 3 (March 1, 2015): 266–78. http://dx.doi.org/10.1093/treephys/tpv014.

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Marchin, Renée M., Alice A. Broadhead, Laura E. Bostic, Robert R. Dunn, and William A. Hoffmann. "Stomatal acclimation to vapour pressure deficit doubles transpiration of small tree seedlings with warming." Plant, Cell & Environment 39, no. 10 (August 12, 2016): 2221–34. http://dx.doi.org/10.1111/pce.12790.

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Subramanian, V. Bala, S. Venkateswarlu, M. Maheswari, and M. Narayana Reddy. "Influence of Solar Radiation and Vapour Pressure Deficit on Transpiration Efficiency of Rainfed Sorghum." Journal of Agronomy and Crop Science 171, no. 5 (December 1993): 336–42. http://dx.doi.org/10.1111/j.1439-037x.1993.tb00149.x.

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Monteith, J. L. "Significance of the Coupling between Saturation Vapour Pressure Deficit and Rainfall in Monsoon Climates." Experimental Agriculture 22, no. 4 (October 1986): 329–38. http://dx.doi.org/10.1017/s0014479700014575.

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SUMMARYIn monsoon climates, the mean daytime saturation vapour pressure deficit (D), measured at screen height, decreases from a maximum of 3–4 kPa attained several months before rain arrives to a minimum of 0.5–1 kPa in the month of highest rainfall. Climatic records from India and West Africa were analysed to give the relation between D and precipitation (P mm month−1) as:where n ranged from 0.5 to 0.9 between stations.The dependence of dry matter production on D and therefore on P is evaluated when growth is restricted by rain and when this restriction is removed by irrigation. In the first case, the decrease in demand for water associated with a decrease in D is comparable in importance with the increase of water supply (P). The analysis has implications for the marginal response of crops to supplemental irrigation and for the interpretation of experiments with a line-source or rain-shelter.

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Journal articles on the topic 'Vapour pressure deficit'

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