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题名: Revegetation in China's Loess Plateau is approaching sustainable water resource limits
作者: Feng, Xiaoming; Fu, Bojie; Piao, Shilong; Wang, Shuai; Ciais, Philippe; Zeng, Zhenzhong; Lu, Yihe; Zeng, Yuan; Li, Yue; Jiang, Xiaohui; Wu, Bingfang
刊名: NATURE CLIMATE CHANGE
出版日期: 2016-11
卷号: 6, 期号:11, 页码:1019-+
DOI: 10.1038/NCLIMATE3092
部门归属: 城市与区域生态国家重点实验室
英文摘要: Revegetation of degraded ecosystems provides opportunities for carbon sequestration and bioenergy production(1,2). However, vegetation expansion inwater-limited areas creates potentially conflicting demands for water between the ecosystem and humans(3). Current understanding of these competing demands is still limited(4). Here, we study the semi-arid Loess Plateau in China, where the 'Grain to Green' large-scale revegetation programme has been in operation since 1999. As expected, we found that the new planting has caused both net primary productivity (NPP) and evapotranspiration (ET) to increase. Also the increase of ET has induced a significant (p < 0.001) decrease in the ratio of river runoff to annual precipitation across hydrological catchments. From currently revegetated areas and human water demand, we estimate a threshold of NPP of 400 +/- 5 g C m(-2) yr(-1) above which the population will suffer water shortages. NPP in this region is found to be already close to this limit. The threshold of NPP could change by 36% in the worst case of climate drying and high human withdrawals, to C 43% in the best case. Our results develop a new conceptual framework to determine the critical carbon sequestration that is sustainable in terms of both ecological and socio-economic resource demands in a coupled anthropogenic-biological system.
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35655
Appears in Collections:城市与区域生态国家重点实验室_期刊论文

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