Готові списки джерел за темами / Disc pasture meter

Добірка наукової літератури з теми "Disc pasture meter"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Disc pasture meter"

1

Trollope, W. S. W., and A. L. F. Potgieter. "Estimating grass fuel loads with a disc pasture meter in the Kruger National Park." Journal of the Grassland Society of Southern Africa 3, no. 4 (January 1986): 148–52. http://dx.doi.org/10.1080/02566702.1986.9648053.

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2

Zambatis, N., PJK Zacharias, CD Morris, and JF Derry. "Re-evaluation of the disc pasture meter calibration for the Kruger National Park, South Africa." African Journal of Range & Forage Science 23, no. 2 (August 2006): 85–97. http://dx.doi.org/10.2989/10220110609485891.

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3

Dörgeloh, Werner G. "Calibrating a disc pasture meter to estimate above‐ground standing biomass in Mixed Bushveld, South Africa." African Journal of Ecology 40, no. 1 (February 20, 2002): 100–102. http://dx.doi.org/10.1046/j.0141-6707.2001.00338.x.

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4

Brockett, B. H. "Research note: Calibrating a disc pasture meter to estimate grass fuel loads on the Zululand coastal plain." African Journal of Range & Forage Science 13, no. 1 (April 1996): 39–41. http://dx.doi.org/10.1080/10220119.1996.9647892.

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5

Harmse, Christiaan J., Niels Dreber, and Winston SW Trollope. "Disc pasture meter calibration to estimate grass biomass production in the arid dunefield of the south-western Kalahari." African Journal of Range & Forage Science 36, no. 3 (June 26, 2019): 161–64. http://dx.doi.org/10.2989/10220119.2019.1610905.

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6

Bryan, W. B., W. V. Thayne, and E. C. Prigge. "Use of a Disk Meter to Evaluate Continuously Grazed Pastures." Journal of Agronomy and Crop Science 163, no. 1 (August 1989): 44–48. http://dx.doi.org/10.1111/j.1439-037x.1989.tb00735.x.

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7

Virkajärvi, Perttu, and Kaisa Matilainen. "Predicting herbage mass of Phleum pratense L. pastures with a disk meter." Agricultural and Food Science 4, no. 4 (December 1, 1995): 397–405. http://dx.doi.org/10.23986/afsci.72617.

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Анотація:
A simple disk meter was calibrated for predicting the herbage mass (HM) of rotationally grazed pastures dominated by Phleum pratense L. in 1991-1992. A total of 696 paired observations were made on disk height (DH) and HM > 4 cm. The samples were classified for three different statuses: spring growth, post grazing and aftermath. In 1991 three different disk weights (c. 3.5, 5.0 and 6.5 kg/m2) were compared and the lightest disk was chosen for further studies in 1992. The variation in HM was adequately explained by linear models. There were only small differences between the predictive ability of different disk weights, the lightest disk having the highest r2 values. Post grazing and aftermath samples could be pooled, whilst spring growth samples needed a separate model. Year had no significant effect on the parameters of any model. The models chosen were: spring growth HM = -406.7 + 113.4(DH); r2 = 0.95, post grazing and aftermath HM = -629.1 + 122.1(DH); r2 = 0.88. The disk meter is a potential tool for predicting the HM of rotationally grazed timothy pastures.
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8

Little, Ian T., Philip A. R. Hockey†, and Raymond Jansen. "Impacts of fire and grazing management on South Africa’s moist highland grasslands: A case study of the Steenkampsberg Plateau, Mpumalanga, South Africa." Bothalia 45, no. 1 (November 26, 2015). http://dx.doi.org/10.4102/abc.v45i1.1786.

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Background: Grasslands are heavily utilised for livestock agriculture and the resultant degradation through mismanagement contributes to an estimated 60% of this biome being permanently transformed. This study focused on the impact of fire and grazing in moist highland grasslands.Objectives: To determine the contribution of burning frequency and grazing intensity combined (for domestic livestock and indigenous ungulates) on vegetation structure heterogeneity and species diversity.Methods: Eight study sites under different management regimes were sampled over two summers. Vegetation structure characteristics and diversity data were collected monthly within multiple replicates in each study site. A disc pasture meter was used to assess standing biomass. Differences in vegetation structure characteristics, plant community composition and plant species assemblage structure across sites were statistically analysed using analyses of variance, indicator species analyses, multidimensional scaling ordinations and two-way cluster analyses.Results: The combination of heavy grazing and annual burning leads to a distinct plant community dominated by disturbance specialist species. Selective grazing by indigenous herbivores promotes a community of unpalatable species. This study illustrates that fenced indigenous herbivores, even at moderate stocking densities, have a greater detrimental impact on plant diversity and structure than do domestic livestock.Conclusion: Intensive grazing and burning have a detrimental impact on plant species diversity and structure. This also affects resultant palatability for grazing livestock and fenced game. To promote both grazing quality and ecological integrity we recommend a minimum sustainable ‘fodder capacity’ or standing phytomass of 5000 kg per large-animal unit per hectare for domestic livestock in moist highland grasslands.
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9

Van Coller, Helga, Frances Siebert, and Stefan J. Siebert. "Herbaceous species diversity patterns across various treatments of herbivory and fire along the sodic zone of the Nkuhlu exclosures, Kruger National Park." Koedoe 55, no. 1 (February 20, 2013). http://dx.doi.org/10.4102/koedoe.v55i1.1112.

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Анотація:
Understanding relationships between large herbivores and plant species diversity in dynamic riparian zones is critical to biodiversity conservation. The Nkuhlu exclosures in the Kruger National Park (KNP) provided opportunity to investigate spatial heterogeneity patterns within riparian zones, as well as how these patterns are affected by fire and herbivory. A monitoring project was initiated to answer questions about the dynamics of the herbaceous layer and was aimed at determining, (1) whether there exists meaningful variance in herbaceous plant species richness and diversity across different treatments in the ecologically sensitive sodic zone and (2) whether an increase in herbaceous biomass, an artefact of herbivory and fire exclusion, suppresses herbaceous plant species diversity and richness. Herbaceous vegetation was sampled in two 1 m2 circular sub-plots in the eastern and western corners of 81 fixed plots. The biomass of each plot was estimated with a disc pasture meter (DPM) diagonally with the plot. DPM-readings were converted to kg/ha, according to the latest conversions for the Lowveld Savanna. Species richness and biomass showed significant variance across treatments, whereas no significant variation in herbaceous species diversity was perceived. Combined treatment of fire absence and herbivore presence contributed to higher forb species richness in the sodic zone. Biomass is significantly higher in fully fenced areas where herbivores are excluded, as opposed to the open and partially fenced areas. Although no significant variation was recorded for diversity across treatments, lowest diversity was recorded in the absence of all herbivores, especially in combination with fire treatment. Therefore herbivores are essential in sustaining herbaceous plant species richness in the sodic zone, whilst no significant results were found with regard to their effect on species diversity. Although statistically non-significant, fire seems to suppress species richness.Conservation implications: This study could be used as framework to advance and develop science-based management strategies for, at least, the sodic zones of the KNP. Research in these exclosures will create better understanding of these landscapes, benefit ecosystem conservation planning of national parks and also provide valuable long-term information on key ecological processes.
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10

"Calibration of disk pasture meter to estimate a fire fuel load (aboveground plant biomass) for fire management in the northeastern steppe of Mongolia." Mongolian Journal of Biological Sciences 20, no. 1 (2022): 35–40. http://dx.doi.org/10.22353/mjbs.2022.20.03.

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