Multi-Time Scale Evaluation of Forest Water Conservation Function in the Semiarid Mountains Area

Forest water conservation function is an important part of forest ecosystem services. The discontinuous distribution forests in semiarid areas brings difficulties to the quantitative evaluation functions at basin scale. In this paper, we took upstream Xiong’an New Area (Zijingguan—ZJG, Zhongtangmei—ZTM and Fuping—FP basins) as example combine soil assessment tool (SWAT) balance method calculate amount (AFWC) annual, monthly daily scales from 2007 2017, analyzed changes AFWC. results showed that hydrological response unit (HRU) generated with threshold area zero can accurately reflect patch three basins. On annual scale, AFWC were all positive ZJG ZTM basins 2017. While, FP was negative 2009, 2013, 2014 a values mainly appear June September, December March. during extreme precipitation positive, while drought. positively correlated wetness index, needs more humid climate conditions than make store keep stable storage state. above not only provide insight into sustainable resources management region, but also serve reference cases for other regions carry out relevant research work.