Global pattern for the effect of climate and land cover on water yield

2018-11-23 未知

题目：Global pattern for the effect of climate and land cover on water yield

期刊：Nature Communications

作者：Guoyi Zhou1， Xiaohua Wei2，Xiuzhi Chen1，Ping Zhou3，Xiaodong Liu1，Yin Xiao1，Ge Sun4，David F. Scott2， Shuyidan Zhou5， Liusheng Han6 ，Yongxian Su6

单位：1.South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China. 2.Earth & Environmental Sciences and Physical Geography,  University of British Columbia (Okanagan campus), Kelowna, British Columbia, Canada V1V1V7. 3.Department of Forest Ecology, Guangdong Academy of  Forestry, Guangzhou 510520, China.  4.Eastern Forest Environment Threat Assessment Center, USDA Forest Service, Raleigh, North Carolina 27606, USA. 5.Beijing Institute of Technology, Zhuhai Campus, Zhuhai 519088, China. 6.Guangzhou Institute of Geography, Guangzhou 510070, China.  

摘要：Research results on the effects of land cover change on water resources vary greatly and the  topic remains controversial. Here we use published data worldwide to examine the validity of  Fuh’s equation, which relates annual water yield (R) to a wetness index (precipitation/  potential evapotranspiration; P/PET) and watershed characteristics (m). We identify two  critical values at P/PET ¼ 1 and m ¼ 2. m plays a more important role than P/PET when mo2,  and a lesser role when m42. When P/PETo1, the relative water yield (R/P) is more  responsive to changes in m than it is when P/PET41, suggesting that any land cover changes  in non-humid regions (P/PETo1) or in watersheds of low water retention capacity (mo2) can  lead to greater hydrological responses. m significantly correlates with forest coverage,  watershed slope and watershed area. This global pattern has far-reaching significance in  studying and managing hydrological responses to land cover and climate changes.