Water Conservation of Forest Ecosystem and its Spatial Differences Based on Dynamics of Soil Water Storage in Anji County

Water conservation is one of the important ecosystem services and forest soil plays a dominating role in conserving and regulating rainfall.With the increasing demand for clean water,the water conservation of forest ecosystem arouses considerable concerns.Based on the data of Category Ⅱ inventory of the forest resources in Anji County(2007) and daily precipitation,the water conservation of the forest ecosystems was estimated,using dynamics of soil water storage method.We also generated the spatial grid data of soil water storage capacity and precipitation and made raster calculations to show the spatial difference of water conservation.The results showed that a volume of 19.66×108 t was conserved in the forest ecosystem,and the water conservation capacity per unit area reached 14788 t/hm2.The volume of water conservation had a downward trend from upstream to downstream of Xitiaoxi River basin.The bamboo forest was the main contributor to the water conservation in Anji forest ecosystem(52.26%),followed by the broadleaf forest and the coniferous forest.