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1 January 2017 Livestock Dynamic Responses to Climate Change in Alpine Grasslands on the Northern Tibetan Plateau: Forage Consumption and Time-Lag Effects
Feng Yunfei, Zhang Xianzhou, Shi Peili, Fu Gang, Zhang Yangjian, Zhao Guangshuai, Zeng Chaoxu, Zhang Jing
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Abstract

Climate change and forage-intake are important components of livestock population systems, but our knowledge about the effects of changes in these properties on livestock is limited, particularly on the Northern Tibetan Plateau. Based on corresponding independent models (CASA and TEM), a human-induced NPP (NPPH) value and forage-intake threshold were obtained to determine their influences on livestock population fluctuation and regrowth on the plateau. The intake threshold value provided compatible results with livestock population performance. If the forage-intake was greater than the critical value of 1.9 (kg DM d-1 sheep-1), the livestock population increased; otherwise, the livestock population decreased. It takes four years to transfer a disturbance in primary productivity to the next trophic level. The relationships between livestock population and NPPH value determined population dynamics via the forage-intake value threshold. Improved knowledge on lag effects will advance our understanding of drivers of climatic changes on livestock population dynamics.

Feng Yunfei, Zhang Xianzhou, Shi Peili, Fu Gang, Zhang Yangjian, Zhao Guangshuai, Zeng Chaoxu, and Zhang Jing "Livestock Dynamic Responses to Climate Change in Alpine Grasslands on the Northern Tibetan Plateau: Forage Consumption and Time-Lag Effects," Journal of Resources and Ecology 8(1), 88-96, (1 January 2017). https://doi.org/10.5814/j.issn.1674-764x.2017.01.011
Received: 30 October 2016; Accepted: 1 December 2016; Published: 1 January 2017
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KEYWORDS
forage-intake
livestock
Northern Tibetan Plateau
NPP
threshold
time-lagged effect
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