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Dynamics
and
sustainability of the inner Mongolia typical steppe: Ecosystem responses to grazing
and
climate.
Lindsey. Christensen Colorado State University. 2001
Dissertation Abstracts International 63-01B.
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題名:
Dynamics
and
sustainability of the inner Mongolia typical steppe: Ecosystem responses to grazing
and
climate.
著者:
Lindsey. Christensen
Colorado State University.
主題:
Ecology
所屬期刊:
Dissertation Abstracts International 63-01B.
描述:
The purpose of this study is to examine interactions of historic, present,
and
future climate patterns, vegetation patterns,
and
grazing practices to better comprehend
and
predict the sustainability
and
resilience of the Mongolian steppe grassland ecosystem. This study will utilize SAVANNA (a dynamic, spatially extensive ecosystem model) to understand, interpret,
and
predict how future grazing, soils, vegetation,
and
climate patterns interact to affect ecosystem sustainability
and
resilience.
Field results suggest that production of these grasslands has declined with increased grazing intensity. This information was incorporated in the model structure to examine future stability
and
resilience of this vegetation system. This analysis also used Savanna to simulate both vegetation
and
livestock production, which gave further insight into potential effects management, climate,
and
grazing on the sustainability of grassland systems.
Simulations that examined the effects of livestock density on vegetation showed a moderate level of grazing (∼50% of vegetation removed) was sustainable for this particular system. This region was resilient to light
and
moderate levels of grazing; however, higher grazing intensities, in combination with low precipitation events, resulted in decreased herbaceous net primary production
and
increased shrub net primary production. Once initiated, these patterns continued even by an after-the-fact removal of grazing from this region.
When predicted climate change scenarios were utilized in model simulations, results showed this grazing system was most sensitive to changes in precipitation patterns; however combinations of precipitation, temperature,
and
CO 2 had synergistic effects on herbaceous production. Greater increases in temperature put a larger stress on the sustainability of herbaceous vegetation, which resulted in unsustainable herbaceous biomass-alleviated only by a reduction in grazing intensity. Only increased precipitation, CO2, or the combination of the two lessened the effects of a large increase in temperature. Simulations with climate change indicate that grazing increases the vulnerability of sustainable grassland systems to climate change. Therefore management must change grazing rates when net primary production is decreased to maintain grassland sustainability.
出版者:
Thesis (Ph.D.)--Colorado State University, 2001.
建立日期:
2001
格式:
138 p..
語言:
英文
識別號:
ISBN9780493514536
資源來源:
NUTN ALEPH
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