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Zhang J.,Chinese Research Academy of Environmental Sciences | Zhang J.,State Environmental Protection Key Laboratory of Regional Ecological Processes and Functions Assessment | Zhang L.,Chinese Research Academy of Environmental Sciences | Zhang L.,State Environmental Protection Key Laboratory of Regional Ecological Processes and Functions Assessment | And 7 more authors.
Journal of Geographical Sciences | Year: 2014

The Three-River Headwaters region in China is an ecological barrier providing environmental protection and regional sustainable development for the mid-stream and downstream areas, which also plays an important role in animal husbandry in China. This study estimated the grassland yield in the Three-River Headwaters region based on MODIS NPP data, and calculated the proper livestock-carrying capacity of the grassland. We analyzed the overgrazing number and its spatial distribution characteristics through data comparison between actual and proper livestock-carrying capacity. The results showed the following: (1) total grassland yield (hay) in the Three-River Headwaters region was 10.96 million tons in 2010 with an average grassland yield of 465.70 kg/hm2 (the spatial distribution presents a decreasing trend from the east and southeast to the west and northwest in turn); (2) the proper livestock-carrying capacity in the Three-River Headwaters region is 12.19 million sheep units (hereafter described as "SU"), and the average stocking capacity is 51.27 SU [the proper carrying capacity is above 100 SU/km2 in the eastern counties, 60 SU/km2 in the central counties (except Madoi County), and 30 SU/km2 in the western counties]; and (3) total overgrazing number was 6.52 million SU in the Three-River Headwaters region in 2010, with an average overgrazing ratio of 67.88% and an average overgrazing number of 27.43 SU/km2. A higher overgrazing ratio occurred in Tongde, Xinghai, Yushu, Henan and Zêkog. There was no overgrazing in Zhiduo, Tanggula Township and Darlag, Qumerleb and Madoi. The remainder of the counties had varying degrees of overgrazing. © 2014 Science Press and Springer-Verlag Berlin Heidelberg. Source


Hou L.-P.,Chinese Research Academy of Environmental Sciences | Hou L.-P.,Hebei Normal University | He P.,Chinese Research Academy of Environmental Sciences | He P.,State Environmental Protection Key Laboratory of Regional Ecological Processes and Functions Assessment | And 4 more authors.
Wetland Science | Year: 2012

Due to remarkable width effect of riparian buffer on stagnating runoff, depositing sediment and controlling non-point source pollution, it is critical to determine its width. On the basis of the brief introducing international riparian buffer strips' policy and management methods, this paper not only overviews the determination methods of riparian buffer and their principles and parameters, including methods based on complex or simple mathematical models, and the other models and guides, but also comments on their advantages and disadvantages. Furthermore, this paper forecast the research prospect of riparian buffer strips in China.The methods of determining riparian buffer strips' width provide a reference for riparian ecosystem management, buffer strips planning and construction. Source

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