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| Livestock-carrying capacity and overgrazing status of alpine grassland in the Three-RiverHeadwaters region,China简 | |
| 作者姓名： | ZHANG Jiping ZHANG Linbo LIU Weiling QI Yue WO Xiao |
| 摘 要： | The Three-River Headwaters region in China is an ecological barrier providing en- vironmental protection and regional sustainable development for the mid-stream and down- stream 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 be- tween 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 cen- tral 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 Z~kog. There was no overgrazing in Zhiduo, Tanggula Township and Darlag, Qumerleb and Madoi. The re- mainder of the counties had varying degrees of overgrazing. |
| 关 键 词： | 三江源地区 过度放牧 承载能力 高山草原 牲畜 中国 空间分布特征 区域可持续发展 |
Livestock-carrying capacity and overgrazing status of alpine grassland in the Three-River Headwaters region, China |
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| ZHANG Jiping,ZHANG Linbo,LIU Weiling,QI Yue,WO Xiao.Livestock-carrying capacity and overgrazing status of alpine grassland in the Three-River Headwaters region, China[J].Journal of Geographical Sciences,2014,24(2):303-312. | |
| Authors: | Jiping Zhang Linbo Zhang Weiling Liu Yue Qi Xiao Wo |
| Institution: | 1. Chinese Research Academy of Environmental Sciences, Beijing, 100012, China 2. State Environmental Protection Key Laboratory of Regional Ecological Processes and Functions Assessment, Beijing, 100012, China 3. Faculty of Geomatics, East China Institute of Technology, Nanchang, 330012, China |
| Abstract: | 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. |
| Keywords: | proper livestock-carrying capacity actual livestock-carrying capacity overgrazing number Three-River Headwaters region |
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