Water yield reduction due to forestation in arid mountainous regions, northwest China

查看全文 作　　者：Pengtao [1]YU;Yanhui [1]WANG;Xudong [2]WU;Xiaohong [1]DONG;Wei [1]XIONG;Gaowa [2]BU;Shunli [3]WANG;Jinye [4]WANG;Xiande [3]LIU;Lihong [1]XU

机构地区：[1]Research Institute of Forest Ecology, Environment and Protection, The Chinese Academy of Forestry, Beijing, 100091, China;[2]College of Ecology and Environmental Science, Inner Mongolia Agriculture University, Hohhot, 010018, China;[3]Academy of Water Resources Conservation Forests in Qilian Mountain of Gansu Province, Zhangye, 734000, Gansu, China;[4]Tour College of Guilin University of Technology, Guilin, 541004, Guangxi, China

出　　处：《International Journal of Sediment Research》索引2010年第25卷第4期,共8页

基　　金：the National Science Foundation of China (40671038, 40730631);the State Forestry Administration of China (200904056, 200904005);the Chinese Academy of Forestry (CAFYBB2007038)and the Key Laboratory for Forest Ecological Environment of the State Forestry Administration of China 摘　　要：Forestation has been encouraged worldwide due to increasing demand for forest products, and for its ecological benefits such as soil erosion control and sediment reduction. However, forestation reduces runoff, thus potentially aggravating water shortages in arid regions. In order to quantitatively estimate the possible water yield reductions caused by forestation in an arid region, a small watershed (the Pailugou watershed) in the Qilian Mountains of northwest China was chosen as a study area. The responses of hydrological dynamics to different forestation scenarios in the study area were simulated using the TOPOG model. The results showed that forestation could lead to a complete loss of runoff at the site scale. At the watershed scale, a 10% increase in forest coverage led to a runoff reduction of 25.6 mm, equivalent to 13% of the runoffin the un-forested watershed. However, due to climatological and topographical constraints, the potential forest distribution occupied only 46.3% of the watershed area, and runoff reduction was estimated to reach a maximum of 60% when the forest cover ratio increased from 0.41% to 46.1%. Actual forest coverage is 36% in the study area, thus the water yield will be reduced with any further increase in forest area. Our study suggested that a trade-off between the numerous benefits of forest coverage increase and its negative impact on water yield should be carefully addressed in arid regions with inherently severe water-shortage. 关键词：干旱山区造林产水量中国干旱地区造林森林覆盖率水资源短缺问题西北土壤侵蚀控制

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Water yield reduction due to forestation in arid mountainous regions, northwest China

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