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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
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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摘要 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.
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YiPing FANG
DaHe QIN
YongJian DING
关键词:  soil water  water stress  deficit irrigation  numerical simulation  photosynthesis  arid region    
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
收稿日期:  2010-01-07      修回日期:  2010-03-22           出版日期:  2010-06-07      发布日期:  2010-06-07      期的出版日期:  2010-06-07
基金资助: National Basic Research Program of China (2007CB411507); Open Fund of the State Key Laboratory of Cryosphere Science (SKLCS08-05)
通讯作者:  YiPing FANG    E-mail:  ypfang@imde.ac.cn; ypfang2004 @yahoo.ca
引用本文:    
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[J]. 干旱区科学, 10.3724/SP.J.1227.2010.00116.
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.
链接本文:  
http://jal.xjegi.com/CN/10.3724/SP.J.1227.2010.00116  或          http://jal.xjegi.com/CN/Y2010/V2/I2/116
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