Дисертації з теми "Respiration variations"
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Dhervillez, Catherine. "Contribution à l'étude des mécanismes des variations respiratoires du rythme cardiaque chez le rat." Lille 1, 1987. http://www.theses.fr/1987LIL10092.
Повний текст джерелаMavrogiannis, Apostolos. "Variations in the ventilatory and lactate thresholds with prolonged aerobic exercise." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25127.
Повний текст джерелаEducation, Faculty of
Curriculum and Pedagogy (EDCP), Department of
Graduate
Comstedt, Daniel. "Explaining temporal variations in soil respiration rates and delta13C in coniferous forest ecosystems." Doctoral thesis, Örebro universitet, Institutionen för naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-2055.
Повний текст джерелаCeschia, Eric. "Environmental effects on spatial and seasonal variations of stem respiration in European beech and Norway spruce /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-6303-3.pdf.
Повний текст джерелаCeschia, Eric. "Effets environnementaux sur les variations spatiales et saisonnières de la respiration ligneuse chez le hêtre et l'épicéa." Paris 11, 2001. http://www.theses.fr/2001PA112349.
Повний текст джерелаThis thesis discusses the environmental and biological factors controlling stem respiration in beech and Norway spruce trees. The results are based on field experiments in France and Sweden in 1997-2000. Effects of fertilization and high atmospheric [CO2] on stem growth and respiration were studied. Woody respiration varied with seasonal changes in temperature and secondary growth. Spatial variation in respiration was explained by temperature gradients, uneven distribution of living cells, differences in diameter increment along the axis and variations in tissue vitality. Higher respiration rates usually were found in the upper stem or in the crown. Neglect of spatial variation in respiration led to errors in estimating annual aboveground woody respiration (Rag) of 30-110%. Rag represented 30% of annual respiration in the beech forest. Rag was 245-289 g C m-2a-1 in beech, 64 and 134 g C m-2 a-1 in control and fertilized stands of Norway spruce, respectively. Carbon use efficiency was 0. 58, 0. 71, and 0. 72 for beech trees, control and fertilized spruce trees, respectively. Growth respiration represented ca. 40% of total stem respiration. The wood construction cost (rG) was on average 0. 2 and 0. 16 g C respired g-1 C fixed in the new wood of beech and spruce trees. For both species, rG was higher in the crown than at breast height. Fertilization increased rG in spruce, but maintenance respiration (RM) was not affected. High [CO2] had little effect on rG in spruce and none in beech. [CO2] had no effect on Rm when fertilization was applied but Rm increased by a factor of 2. 5 for spruce in absence of fertilization. A change in wood composition of trees grown in high [CO2] without fertilization, apparently caused the increase in rG and Rm. In perspective of global warming, Rag would increase by 25% and 14% in young beech and Norway spruce forests, respectively, and the combined effect of high [C02] and global, warming would increase Rag by a factor of 2. 3 in spruce stands
Comstedt, Daniel. "Explaining temporal variations in soil respiration rates and delta13C in coniferous forest ecosystems." Doctoral thesis, Örebro University, Institutionen för naturvetenskap Department of Natural Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-2055.
Повний текст джерелаSoils of Northern Hemisphere forests contain a large part of the global terrestrial carbon (C) pool. Even small changes in this pool can have large impact on atmospheric [CO2] and the global climate. Soil respiration is the largest terrestrial C flux to the atmosphere and can be divided into autotrophic (from roots, mycorrhizal hyphae and associated microbes) and heterotrophic (from decomposers of organic material) respiration. It is therefore crucial to establish how the two components will respond to changing environmental factors. In this thesis I studied the effect of elevated atmospheric [CO2] (+340 ppm, 13C-depleted) and elevated air temperature (2.8-3.5 oC) on soil respiration in a whole-tree chamber (WTC) experiment conducted in a boreal Norway spruce forest. In another spruce forest I used multivariate modelling to establish the link between day-to-day variations in soil respiration rates and its δ13C, and above and below ground abiotic conditions. In both forests, variation in δ13C was used as a marker for autotrophic respiration. A trenching experiment was conducted in the latter forest in order to separate the two components of soil respiration. The potential problems associated with the trenching, increased root decomposition and changed soil moisture conditions were handled by empirical modelling. The WTC experiment showed that elevated [CO2] but not temperature resulted in 48 to 62% increased soil respiration rates. The CO2-induced increase was in absolute numbers relatively insensitive to seasonal changes in soil temperature and data on δ13C suggest it mostly resulted from increased autotrophic respiration. From the multivariate modelling we observed a strong link between weather (air temperature and vapour pressure deficit) and the day-to-day variation of soil respiration rate and its δ13C. However, the tightness of the link was dependent on good weather for up to a week before the respiration sampling. Changes in soil respiration rates showed a lag to weather conditions of 2-4 days, which was 1-3 days shorter than for the δ13C signal. We hypothesised to be due to pressure concentration waves moving in the phloem at higher rates than the solute itself (i.e., the δ13C–label). Results from the empirical modelling in the trenching experiment show that autotrophic respiration contributed to about 50% of total soil respiration, had a great day-to-day variation and was correlated to total soil respiration while not to soil temperature or soil moisture. Over the first five months after the trenching, an estimated 45% of respiration from the trenched plots was an artefact of the treatment. Of this, 29% was a water difference effect and 16% resulted from root decomposition. In conclusion, elevated [CO2] caused an increased C flux to the roots but this C was rapidly respired and has probably not caused changes in the C stored in root biomass or in soil organic matter in this N-limited forest. Autotrophic respiration seems to be strongly influenced by the availability of newly produced substrates and rather insensitive to changes in soil temperature. Root trenching artefacts can be compensated for by empirical modelling, an alternative to the sequential root harvesting technique.
Thomachot, Laurent. "Effet des variations de température et d'humidification des gaz inspires sur la mécanique pulmonaire chez le sujet en ventilation contrôlée." Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX20844.
Повний текст джерелаMaxime, Valérie. "Contribution à l'étude de la physiologie respiratoire du saumon atlantique (Salmo salar L. ) aux différentes étapes critiques de son cycle biologique : influence des variations de salinité ambiante." Brest, 1990. http://www.theses.fr/1990BRES2013.
Повний текст джерелаCourtiol, Emmanuelle. "L'inextricable relation olfaction-respiration chez le rat : études de l'impact des variations de flairages sur l'activité du bulbe olfactif et sur la discrimination des odeurs." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-01070877.
Повний текст джерелаCourtiol, Emmanuelle. "L’inextricable relation olfaction-respiration chez le rat : études de l’impact des variations de flairages sur l’activité du bulbe olfactif et sur la discrimination des odeurs." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10309/document.
Повний текст джерелаIn terrestrial mammals, an inextricable link between olfaction and respiration exists due to the periodic sampling of odorant molecules by inhalation. The features of sniffing (or breathing) constrain both the timing and the intensity of the input to the olfactory structures. But rather than being fixed, sniffing in the bahavingrodent is highly dynamic and varies both in frequency and flow rate. During the firs stage of my PhD, I asked to what extent sniffing parameters (frequency and flow rate) variations could affect the olfactory bulb activity. To address this question, I developped a double tracheotomy protocol in anesthetized rats to precisely control and modify the nasal airflow. In parallel, I recorded oldfactory bulbactivities, single-unit activity and local field potentials. We showed that, at the olfactory bulb level, the neutral representation of an odor is highly modified by sampling variations. In fact both the mitral/tufted cell discharge patterns and local field potentials oscilliations were affected by sniffing variations. In the second stage, we wanted to understand the role of sniffing variations in behaving animals. We hypothesized tha t an animal could adapt its sniffing strategy relative to the quality of the odorant molecules. To test this hypothesis, we developped a tool to record sniffing in a non invasive way, and combined it to an olfactory discrimination task in the rat. We showed that animals not only adapted their sniffing relative to the odorant quality but also to the odorant context. Taken together, these results fit into the broader context of sensory-motor integration
Cara, Hervé. "Conception d'un dispositif pour la détection automatique des premières variations du niveau de vigilance du conducteur au volant de son véhicule : capteur non-contraignant et électronique associée." Vandoeuvre-les-Nancy, INPL, 1992. http://www.theses.fr/1992INPL010N.
Повний текст джерелаAt the present time, there is no strainless and reliable mean to automatically detect the first variations of vigilance- state of a vehicule driver. This study is based upon the determination of the physiological parameter (breathing rhythm regularity) to predict sleeping one or two minutes before it occurs. Tests in a leepinglaboratory have pointed out that the EEG activity, during the early sleeping phase is characterized by a breathing rhythm regularization. Besides, this study deals with aH associated electronics of the data acquisition and processing device to seize the signal of thoracic impedance criterions : sens or, useful signal and detection criterions. After that, this report presents the results of the validation tests of detection device and the tests in real condition
Stahl, Clément. "Variations saisonnières des flux de CO2 et H2O au niveau des feuilles et des troncs des arbres de la canopée en forêt tropicale humide guyanaise." Thesis, Nancy 1, 2010. http://www.theses.fr/2010NAN10049/document.
Повний текст джерелаThe aim of this work was to characterize the seasonal variations in leaf and trunk gas exchange of tropical rainforest canopy trees exposed to dry seasons. This study focused on measuring gas exchange (CO2 and H2O) at the leaf and trunk level during dry seasons in a Terra firme forest and in a seasonally flooded forest in order to specify their sensitivity and response to drought.Our results showed that part of the studied trees do not encounter a large reduction in soil water content during dry seasons, suggesting that they display deep rooting systems.During long dry periods, we recorded a decrease in leaf photosynthesis, trunk CO2 efflux or sap flow density, and foliar respiration to a lesser extent, for a majority of the trees. Nevertheless, large differences among trees in their response to these conditions were observed, suggesting distinct sensitivities and response to soil drought among trees. Furthermore, these variations were greatest when soil drought was highest (2008 as compared to 2007).In seasonally flooded forest, the decrease in gas exchange was less, suggesting that these trees do have access to wet layers during the dry season, close to the groundwater. However, during wet seasons, we observed a negative effect of anoxia for some trees, whereas others did not display any response, suggesting large differences in tolerance to anoxia among trees abundant in these seasonally flooded forests.We conclude that would seasonal soil droughts increase over the next decades, large vegetation changes might occur because of the large differences among trees in their functional response to soil drought conditions
Cannavo, Patrice. "Variations saisonnières des activités respiratoire aérobie et dénitrifiante dans la zone non saturée du sol : expérimentation sur une parcelle agricole du Comtat Venaissin et modélisation." Avignon, 2003. http://www.theses.fr/2003AVIG0030.
Повний текст джерелаNitrate (NO3-) groundwater contamination, in addition to greenhouse gases emissions such as carbon dioxide (CO2) and nitrous oxide (N2O) are crucial environmental and agronomic problems. The goal of this work was to characterize during a 7-months period C and N dynamics coupled to microbial activities in the vadose zone, emphasizing notably the interest in taking into account the existing biological processes in the deep vadose zone. Thus, a soil profile situated in an arable field in the Comtat Venaissin (Velleron, 84) was studied. The vadose zone (almost 2. 5 m thick) was equipped for water, heat, solute and gas fluxes measurements, during an inter-cropping period, from corn harvesting and tillage with incorporation of maize residues (end of October 2001), to the next sowing (beginning of May 2002). Microbial analysis were performed in order to follow (1) the aerobic respiratory and denitrifying potential activities, and (2) heterotrophic and denitrifying micro-organisms. Results showed the strong environmental factors influence (rainfall, soil temperature, NO3- content, and dissolved organic carbon (DOC) quality) on microbial activities. In the deep vadose zone, the NO3- content was a limiting factor for the denitrifying activity, and the DOC quality was in part responsible of the aerobic respiratory activity seasonal variations. The biogeochemical processes, which occurred during the field experiment, were satisfactorily simulated by the PASTIS model. The addition of a new module for gas transport using the dusty gas theory allowed us to estimate correctly CO2 and N2O concentrations in the soil. The comparison model-experiment suggests to study the following elements: (1) to take into account the soil structure and to work at the aggregate scale, (2) to study the soil freezing effect on zymogenous biomass behaviour, and (3) to take into account the enzymatic activity, notably the N2O reductase enzymatic activity. These elements are really important in order to perform C and N amounts reaching the groundwater
Emeriaud, Guillaume. "Variations de la capacité résiduelle fonctionnelle chez le prématuré. Interactions avec la ventilation assistée." Phd thesis, Université Joseph Fourier (Grenoble), 2008. http://tel.archives-ouvertes.fr/tel-00338412.
Повний текст джерелаLa caractérisation de la variabilité de la CRF, reflet du degré de liberté du système de contrôle, et la mesure de l'activité tonique du diaphragme, reflet des efforts du nourrisson pour augmenter la CRF, devraient permettre d'améliorer encore la compréhension de la régulation de la CRF, et d'améliorer la prise en charge ventilatoire de ces patients.
Jian, Jinshi. "Global soil respiration: interaction with macroscale environmental variables and response to climate change." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/92195.
Повний текст джерелаPh. D.
Hart, Adam Michael. "Seasonal Variation in Whole Stream Metabolism across Varying Land Use Types." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23256.
Повний текст джерелаMaster of Science
Searle, Stephanie Yoke-Ying. "The temperature dependence of plant alternative oxidase and its impact on respiration rates in nature." Thesis, University of Canterbury. School of Biological Sciences, 2010. http://hdl.handle.net/10092/5930.
Повний текст джерелаMarino, Polly. "Studies on assembly and genetic variation in mitochondrial respiratory complex I." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289386.
Повний текст джерелаDennis, Wilson Dennis. "Estimation of Carbon Dioxide emissions from forest soils based on CO2 concentrations." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-33240.
Повний текст джерелаAtaka, Mioko. "Effect of the moisture heterogeneity of leaf litter layer on temporal and spatial variation in the litter heterotrophic respiration in a warm-temperate forest." Kyoto University, 2015. http://hdl.handle.net/2433/199356.
Повний текст джерела0048
新制・課程博士
博士(農学)
甲第19032号
農博第2110号
新制||農||1031(附属図書館)
学位論文||H27||N4914(農学部図書室)
31983
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 谷 誠, 教授 北山 兼弘, 教授 本田 与一
学位規則第4条第1項該当
Dann, Jeremiah. "Interindividual variation in the embryonic and larval respiration rates of the polar marine invertebrate Sterechinus neumayeri and Odontaster validus and the poecilogenous spionidid Streblospio benedicti." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 71 p, 2009. http://proquest.umi.com/pqdweb?did=1654488301&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаMariappan, Sankar. "Soil redistribution impacts on the spatial variation of nutrients, net carbon exchange with the atmosphere and soil respiration rates in highly eroding agricultural fields from the foothills of the Indian Himalaya." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/23757.
Повний текст джерелаCalabrese, Pascale. "Recherche d'une méthode de mesure non-invasive des résistances respiratoires : effets ventilatoires et cardiaques de charges résistives." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE19013.
Повний текст джерелаBrito, Liziane de Figueiredo. "Emissão do CO2 do solo em diferentes posições topográficas em área sob cultivo de cana-de-açúcar /." Jaboticabal : [s.n.], 2008. http://hdl.handle.net/11449/105188.
Повний текст джерелаAbstract: The spatial and temporal variation of soil CO2 emission is influenced by several soil attributes related to CO2 production and gas transport from soil to atmosphere. However, few studies aiming to understand the effect of topography on the variability of CO2 emissions exist, especially on the sugarcane harvest system without prior burning. The objective of this work was to study the spatial and temporal changes of the soil CO2 emission in an area cultivated with sugar cane, having a mechanized crop system, under different relief forms and slope positions. In a landscape it was selected one area located in a concave form (CONC) and two others located at superior (ESUP) and inferior (EINF) positions in a linear form. It was conducted measurements of soil CO2 emission and soil attributes at the three different locations in two different situations: (1) in 2004, one month after sugarcane plantation, measurements were conducted with randomized repetitions for each area in each sampling day, and soil CO2 emission, soil temperature and soil moisture were also monitored during a period of 7 months, and (2) in 2005, one month after sugarcane harvesting without burning, the spatial variability of soil CO2 emission and soil attributes were characterized by the semivariance in the same topographic positions. Total soil CO2 emission during this period was 19,26, 23,03 e 22,29 Mg CO2 ha-1 for CONC, ESUP e EINF areas, respectively. Temporal variability of soil CO2 emission was explained by an exponential function with soil temperature and a linear function with soil moisture. The 10 Q values were 1.98 (±0.34), 1.81 (±0.49) and 1.71 (±0.31) for CONC, ESUP and EINF, respectively. The effect of relief form and topographic position on soil CO2 emission variation was dependent on the time of measurement. Bulk density, macroporosity, penetration resistance, aggregation and oxidizable organic ...(Comlete abstract, click electronic access below)
Orientador: Newton La Scala Júnior
Coorientador: José Marques Júnior
Banca: Carlos Eduardo Pellegrino Cerri
Banca: Zigomar Menezes de Souza
Banca: Gener Tadeu Pereira
Banca: Wanderley José de Melo
Doutor
El, haïkali Bouazza. "Estimations des productions organique et inorganique de quelques espèces macrophytobenthiques méditerranéennes calcifiées : interactions avec les conditions naturelles du milieu et rôle dans la variabilité circadienne de certaines caractéristiques physico-chimiques des eaux cotières." Aix-Marseille 2, 2009. http://www.theses.fr/2004AIX22105.
Повний текст джерелаBrito, Liziane de Figueiredo [UNESP]. "Emissão do CO2 do solo em diferentes posições topográficas em área sob cultivo de cana-de-açúcar." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/105188.
Повний текст джерелаConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A variação espacial e temporal da emissão de CO2 do solo é influenciada por atributos do solo relacionados à produção e ao transporte do gás soloatmosfera. Entretanto, ainda são escassos estudos visando compreender o efeito da topografia sobre a variabilidade da emissão de CO2 do solo, especialmente em área de conversão para o sistema de colheita da cana-de-açúcar mecanizada sem queima. Este trabalho tem como objetivo estudar as variações da emissão de CO2 do solo, em área cultivada com cana-de-açúcar, com histórico de colheita mecanizada sem queima, sob diferentes formas do relevo e posições na encosta. Foram selecionadas uma área situada numa superfície côncava (CONC) e outras duas em posições contrastantes numa superfície linear (encosta superior – ESUP e encosta inferior – EINF). Foram conduzidas avaliações da emissão de CO2 e de atributos do solo, nas três áreas, em duas situações distintas: (1) em 2004, um mês após plantio da cana-de-açúcar, foram conduzidas avaliações em pontos aleatórios em cada uma das três áreas, num mesmo dia, sendo a emissão de CO2, temperatura e umidade do solo avaliados ao longo de 7 meses e, (2) em 2005, um mês após o corte mecanizado da cana-de-açúcar crua, foi caracterizada a variabilidade espacial da emissão de CO2 e demais atributos do solo, por meio da semivariância, nas mesmas posições topográficas. A emissão total de CO2 no período de 7 meses de estudo em 2004 foi 19,26, 23,03 e 22,29 Mg CO2 ha-1 nas áreas CONC, ESUP e EINF, respectivamente. A variação temporal da emissão foi explicada por uma relação exponencial com temperatura, e uma relação linear com umidade do solo. O valor de 10 Q , calculado para as posições CONC, ESUP e EINF, foi de 1,98 (±0,34), 1,81 (±0,49) e 1,71 (±0,31). O efeito da forma do relevo e da posição topográfica sobre a variação da emissão de CO2 do...
The spatial and temporal variation of soil CO2 emission is influenced by several soil attributes related to CO2 production and gas transport from soil to atmosphere. However, few studies aiming to understand the effect of topography on the variability of CO2 emissions exist, especially on the sugarcane harvest system without prior burning. The objective of this work was to study the spatial and temporal changes of the soil CO2 emission in an area cultivated with sugar cane, having a mechanized crop system, under different relief forms and slope positions. In a landscape it was selected one area located in a concave form (CONC) and two others located at superior (ESUP) and inferior (EINF) positions in a linear form. It was conducted measurements of soil CO2 emission and soil attributes at the three different locations in two different situations: (1) in 2004, one month after sugarcane plantation, measurements were conducted with randomized repetitions for each area in each sampling day, and soil CO2 emission, soil temperature and soil moisture were also monitored during a period of 7 months, and (2) in 2005, one month after sugarcane harvesting without burning, the spatial variability of soil CO2 emission and soil attributes were characterized by the semivariance in the same topographic positions. Total soil CO2 emission during this period was 19,26, 23,03 e 22,29 Mg CO2 ha-1 for CONC, ESUP e EINF areas, respectively. Temporal variability of soil CO2 emission was explained by an exponential function with soil temperature and a linear function with soil moisture. The 10 Q values were 1.98 (±0.34), 1.81 (±0.49) and 1.71 (±0.31) for CONC, ESUP and EINF, respectively. The effect of relief form and topographic position on soil CO2 emission variation was dependent on the time of measurement. Bulk density, macroporosity, penetration resistance, aggregation and oxidizable organic ...(Comlete abstract, click electronic access below)
Zukurov, Jean Paulo Lopes. "Caracterização molecular de Vírus Respiratório Sincicial Humano (HRSV) isolados na cidade de São Paulo no período de 2007 a 2008." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/87/87131/tde-17082010-131036/.
Повний текст джерелаHuman Respiratory Syncytial Virus (HRSV) is considered the most common cause of lower respiratory tract disease in infants and young children and are the main guilty for the elevated children hospitalizations rate under 5 years of age. The HRSV has a world-wide distribution, being able to attack all the ages however the 6 weeks to 9 months children of are the ones that develop more serious problems as pneumonia and bronquiolite. The HRSV outbreak presents a well defined season, occurring annually in the delayed falls period, winter or springs beginning, but not during the summer. In the present study, we performed a phylogenetic analysis from G2 region of HRSV G glycoprotein. Forty four samples positive for HRSV from University Hospital (UH) of University of Sao Paulo (USP) in 2007-2008, were submitted to sequencing by PCR and compared with GenBank sequences. Phylogenetic analysis revealed that HRSV group A genotypes GA2 and GA5 was the predominant in 2007-2008, alternating the standard verified in the previous years, where the group B genotypes had been highly predominant. Comparison of the synonymous/nonsynonymous mutation ratios showed greater evidence for positive selection pressure for group A genotypes GA2 and GA5.
Chang, Che-Chi, and 張哲誌. "Spatial and Temporal Variations of Plankton Community Respiration in Dongsha Atoll." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/42242960537337202997.
Повний текст джерела國立臺灣師範大學
生命科學研究所
102
This study was designed to explore spatio-temporal variations of plankton community respiration (CR) and organic carbon cycle in Dongsha Atoll. Four curises were performed in different seasons. Results showed that the ragne of CR in spring (May), summer (July), autumn (September), and winter (February) were 41.1~279.2, 9.0~116.0, 41.9~113.9 and 0.0~69.8 mg C m-3 d-1, respectively. The lowest rate was observed in winter. Further analyses suggest that the CR was mostly related to biomass and production of plankton communities, especially phytoplankton and bacterioplankton. This assumption can be verified by significant relationships between mean values (per m3) over water depth of CR vs. chlorophyll a (Chl a), heterotrophic bacterial biomass (BB) or production (BP; all p<0.05). Seasonally, the rate of CR might mostly attribute to phytoplankton, particularly diatom, in spring. This assumption could be validated by significant regressions between CR and Chl a or silicate. In summer, the CR was not related to any observed variables. Even though the estimated bacterial respiration accounting for 24.2% of CR, it can not explain the variation of CR rate. In autumn, CR was significantly related to BB (p<0.05), and it suggests that the CR was dominated by bacterioplankton. As state above, the lowest CR was observed in winter, and it might be due to low plankton biomass. Moreover, the mean ratio of primary production to community respiration was close to or higher than 1, and it indicates that the ecosystem of Dongsha Atoll was either carbon balance or autotrophic. It also suggests that there was residual organic carbon deposited to the bottom of Dongsha Atoll or exported to nearby ecosystems.
Zhong, Min-Hua, and 鐘敏華. "Inter-annual Variations in Soil Respiration in a Moso Bamboo Forest, Central Taiwan." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/r3ta7d.
Повний текст джерелаChang, Yi-Pei, and 張怡佩. "Seasonal Variations of Soil Respiration at Natural Hardwoods and China-fir Plantation in Hui-Sun Experiment Forest." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/71020407026830176579.
Повний текст джерела國立中興大學
森林學系所
97
From August 2006 to December 2007, we used Continue-Open-Flow-Chamber method to measure soil respiration at natural hardwoods (NH) and China-fir plantation (CFP) in Hui-Sun Experiment Forest. There were two treatments in each forest type—“with litter fall” and “without litter fall”. In NH the soil respiration rates were 28.20 ± 3.48 ~ 136.39 ± 3.65 and 19.06 ± 2.88 ~ 88.91 ± 10.37 CO2 kg ha-1 day-1 in treatments with and without litter fall respectively. In CFP the soil respiration rates were 24.84 ± 7.29 ~ 135.10 ± 18.31 and 18.01 ± 1.78 ~ 75.27 ± 5.84 CO2 kg ha-1 day-1 in treatments with and without litter fall respectively. In all treatments, the soil respiration was lower in December and higher in June or July. The annual and monthly rates of soil respiration were both higher in NH than in CFP. The difference between NH and CFP was particularly great in summer. In both forest types, the soil respiration rates were higher in the treatments with litter fall than those without litter fall. However, the Q10 value was lower in treatments with litter fall than those without litter fall, suggesting that the removal of litter fall would increase the temperature sensitivity of soil respirations. In this study, temperature was the most important environmental factor of soil respiration. There was a significantly positive correlation between temperature and soil respiration. Due to high soil moisture in both NH and CFP, the soil moisture had no effects on soil respiration. Microbial biomass N showed the seasonal fluctuation and had a positive correlation with soil respiration, but was not significantly different between NH and CFP. Soil fungal colonies were greater in NH than in CFP, probably resulting in greater litter decomposition rate in NH. In NH the litter amount varied with the seasons, and had a positive correlation with soil respiration. By contrast, the litter of CFP was difficult to decompose, and thus accumulated in a large amount on forest floor. Different forest stands and vegetation types had different litter quality as well as different soil micro-organisms status. The differences in soil respiration between NH and CFP may be caused by different litter fall decomposition rate. And the soil respiration rates would affect the CO2 concentrations in the canopy of forest, and furthermore affect the CO2 concentrations in the atmosphere.
Khoury, Samar. "Étude des variations respiratoires associées à une activité rythmique des muscles de la mastication durant le bruxisme du sommeil." Thèse, 2007. http://hdl.handle.net/1866/8012.
Повний текст джерелаLai, Chao-Chen, and 賴昭成. "Seasonal variation of bacterial respiration and community respiration in a subtropical coastal system." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/55284915495349931690.
Повний текст джерелаWu, Tsung-Han, and 吳宗翰. "Seasona l variation of community respiration in a coastal system with high DOM supply." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/67952126478535554225.
Повний текст джерела國立臺灣大學
海洋研究所
91
Through field studies, this study measured the community respiration rate (CR) at the North Coastal Water in Taiwan weekly between 2001/10 to 2002/8. We measured the other auxiliary parameters simultaneously like water temperature﹑nutrient (NO3 and PO4)﹑particular organic carbon (POC)﹑dissolved organic carbon (DOC)﹑chlorophyll-a concentration (chl-a)﹑primary production (PP) and hetertrophic bacterial production (BP) and try to explore the mechanisms which control the time pattern of CR in this coastal water and role of CR play in carbon cycle. The mean of water’s DOC concentration is 2475μM (1537μM ~ 3056μM, n=41), and it is not distinct seasonal variation, but we found the water’s DOC was high 10 times to general coastal water (200μM). The range of CR is 0μM O2/d ~ 19.65μM O2/d and mean is 3.18 ± 3.2μM O2/d (n=43). The highest value of CR in summer was high to 20 times between the lowest value in winter. The data of analysis exhibited the CR to chl-a (R2=0.54 ; n=42 ; P<0.05 )、POC (R2=0.49 ; n=43 ; P<0.05)、water temperature (R2=0.27 ; n=42 ; P<0.05)’ BP (R2=0.27 ; n=37 ; P<0.05) and BR (R2=0.24 ; n=38 ; P<0.05) has the distinct correct correlation. The result of regression between PP to CR shows that this coastal waters in this area is a heterotrophic ecosystem (P/R=0.47). In this heterotrophic ecosystem, we found that the ratio for BP/PP is high to 1.8 (n=30). As a whole, there is an allochthonus organic carbon source supplying this coastal waters, and it made the DOC which was higher 10 times to normal coastal waters. CR and BP (include BR) had distinct seasonal variation and they had distinct correct correlation with water temperature. It meant that the planktonic organic carbon demand was influenced by organic carbon supply. The result of the controlling temperature CR experiment was support the statement. It is a reasonable phenomenon in the system which had a allochthonus high dissolved organic carbon supply. In coastal waters that is interfered easily by human , the P/R<1 was just determined that the system is the inorganic carbon source in its biota function and heterophic . The P/R ratio in reflecting the organic carbon export is not more effect. In so high DOC system, the functional role of microbial loop may be more important than traditional grazing food chain in organic carbon cycling.
Wilcox, Marianne. "A model of the effects of fluid variation due to body position on Cheyne-Stokes respiration." Thesis, 2013. http://hdl.handle.net/10214/5341.
Повний текст джерелаDepartment of Mathematics and Statistics
Doff, Sotta Eleneide. "Soil Carbon Dioxide dynamics and Nitrogen cycling in an Eastern Amazonian Rainforest, Caxiuana, Brazil." Doctoral thesis, 2006. http://hdl.handle.net/11858/00-1735-0000-0006-B197-C.
Повний текст джерела