Sanjiangyuan Region is the headstream area of three main rivers in Asia, i.e. Yangtze River, Yellow River, and Lancangjiang River ( Mekong) . It is an important ecological barrier of the local and regional environmental security and sustainable development, not only for China but also for the southeastern Asian, In recent decades, however, grasslands in http: / / www.ecologica.cn Sanjiangyuan Region were seriously disturbed or destroyed by both global climate change and human activities, which led to sharp decrease of nourishing capacity of source water and serious environmental problems of the lower reaches. Since 2005, Chinese government began to implement a series of activities, e. g. ' Returning Grazing Land to Grassland Project忆 and ' Ecological Migration Project爷 , in Sanjiangyuan Region to alleviate the situation of grassland degradation, and gradually restore and protect the ecological environment. The success of such projects in Sanjiangyuan Region depends largely on local
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