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How Many Check Dams Do We Need To Build on the Loess Plateau?

zhangxia111 添加于 2012/10/17 8:49:32  1093次阅读 | 0次推荐 | 0个评论

For more than 400 years, check dams have been constructed on the Loess Plateau of China. Over the past several hundred years, people have increasingly realized the advantages of check dams for capturing sediments, improving gully slope stabilities, and increasing croplands. In Environmental Science and Technology, Wang et al. summarized the advantages of check dams for environmental services and food security.(1) The report demonstrated that about 110,000 check dams have been built on the Loess Plateau over the past 50 years and approximately 21 billion m3 of sediments have been captured by these dams. Moreover, the filled check dams can be reclaimed as croplands, and by 2002, approximately 320,000 hectares of dam croplands had been created. The significant role of check dams in soil conservation and cropland expansion inspires the passions of policy makers. As early as 2003, the Ministry of Water Resources of P.R. China (CMWR) initiated a program for check dams in the Loess Plateau, and 163,000 check dams are planned and an investment of 83.06 billion RMB of funding is required for the period 2003–2020.(2) Policy makers consider that the Loess Plateau has the capacity to allow the construction of as many as 334,000 check dams and will therefore require an even greater amount of investment.

作 者:Zhao Jin *, Buli Cui , Yi Song , Weiyu Shi , Kaibo Wang , Yi Wang , and Jing Liang
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学科领域:地球科学 » 地理学 » 区域环境质量与安全
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原文链接:http://pubs.acs.org/doi/full/10.1021/es302835r
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