Abstract:The research of forest benefit evaluation is a hotspot and difficulty at present.We evaluated soil improvement benefit of water and soil conservation forest(WSGF).We tried to find a method that can be used for forest evaluation,and illustrated that comprehensive index of benefit evaluation on soil improvement of WSCF can be regarded as total objective layer of index system,and criterion layer consists of soil fertility,soil anti erodibility and anti sourability.The index layer is composed by soil enzyme a...