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Journal of Arid Land
Journal of Arid Land
Research Articles     
Changes in stress within grassland ecosystems in the three counties of the source regions of the Yangtze and Yellow Rivers
YiPing FANG, DaHe QIN, YongJian DING
1 Institute of Mountain Disaster & Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract  Based on a database of more than 40 years of second production process and energy flow records for Maduo, Qumalai and Yushu counties, a dynamic model of the stress within grassland ecosystems was established using a nonlinear regression method for this source regions of the Yangtze and Yellow Rivers. The results show that dynamic curves of stress within grassland ecosystems in the three counties were in the shape of an inverted “U” during the period 1965–2007. It also revealed that the variation in actual amount of livestock inventories reflected the general trends of the stress within the grassland ecosystems in the source regions, although there were many other factors for the increase or reduction in grassland ecosystem stress.

Key words： soil water      water stress      deficit irrigation      numerical simulation      photosynthesis      arid region     
Received: 07 January 2010      Published: 07 June 2010
Corresponding Authors: YiPing FANG     E-mail: ypfang@imde.ac.cn; ypfang2004 @yahoo.ca
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YiPing FANG
DaHe QIN
YongJian DING
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YiPing FANG, DaHe QIN, YongJian DING. Changes in stress within grassland ecosystems in the three counties of the source regions of the Yangtze and Yellow Rivers. Journal of Arid Land, 2010, 2(2): 116-122.

URL:

http://jal.xjegi.com/10.3724/SP.J.1227.2010.00116     OR     http://jal.xjegi.com/Y2010/V2/I2/116

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