Changes in forest cover can affect not only the total runoff from a watershed,but also the runoff com-ponents(e.g.,surface runoff,interflow,groundwater flow).In this study,based on the WetSpa model simulation method and the recursive digital filtering(RDF)method,the Banchengzi watershed in the mountainous region of Beijing,China,was selected to investigate how changes in forest cover type and cover percentage affect total runoff,surface runoff,interflow,and groundwater flow through scenario settings.Our results show that the difference between the WetSpa model and the RDF method for separating runoff components is small,with only 4.7％and 0.4％difference between the calibration and validation periods.Total runoff in different forest types followed the order shrub forest＞coniferous forest＞mixed forest＞broadleaf forest.Regarding runoff components,the proportions of baseflow(sum of interflow and groundwater flow)to total runoff were 61.1％and 60.8％for broadleaf and mixed forests,which was significantly higher than those of 53.0％and 43.1％for coniferous and shrub forests.However,the proportion of shrub forest baseflow was high in wet years,and that of broadleaf forest baseflow was high in normal and dry years.The proportions of interflow and groundwater flow from various forest cover types to total runoff continued to increase with increasing forest cover rate.Our results have important implications for the implementation of afforestation projects and forest conservation pro-grams,contributing to water resource regulation and ecosystem protection in watersheds.

Bingbing Ding;Yonge Zhang;Xinxiao Yu;Guodong Jia;Yousheng Wang;Yusong Wang;Pengfei Zheng;Zedong Li

The Metropolitan Area Forest Ecosystem Research Station,School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,PR China;Key Laboratory of State Forestry and Grassland Administration on Soil and Water Conservation,Beijing Forestry University,Beijing,100083,PR China;Institute of Sediment Research,China Institute of Water Resources and Hydropower Research,Beijing 100038,PR China

国际水土保持研究（英文）

[1]Bingbing Ding;Yonge Zhang;Xinxiao Yu;Guodong Jia;Yousheng Wang;Yusong Wang;Pengfei Zheng;Zedong Li-.Effects of forest cover type and ratio changes on runoff and its components)[J].国际水土保持研究（英文）,2022(03):445-456

interflow,WetSpa,Banchengzi,baseflow

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