Changes in stress within grassland ecosystems in the three counties of the source regions of the Yangtze and Yellow Rivers

作     者：Fang, YiPing Qin, DaHe Ding, YongJian 

作者机构：Chinese Acad Sci Inst Mt Disaster & Environm Chengdu 610041 Peoples R China Chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst Lanzhou 730000 Peoples R China 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2010年第2卷第2期

页      面：116-122页

核心收录：

学科分类：07[理学] 

基　　金：supported by a grant from the National Basic Research Program of China (2007CB411507) Open Fund of the State Key Laboratory of Cryosphere Science (SKLCS08-05) 

主　　题：the source regions of Yangtze and Yellow Rivers the stress within grassland ecosystems inverted 'U' model driver 

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 ecosys-tems was established using a nonlinear regression method for this source regions of the Yangtze and Yel-low *** results show that dynamic curves of stress within grassland ecosystems in the three coun-ties were in the shape of an inverted U during the period *** also revealed that the variation in actual amount of livestock inventories reflected the general trends of the stress within the grassland eco-systems in the source regions,although there were many other factors for the increase or reduction in grassland ecosystem stress.