On the basis of quantification of damage and hygrophilous extend, the indicator plants was studied by multiple regression.
结果表明，油松林分郁闭度是影响松毛虫害发生的主要因子，林内灌草植物喜湿度对虫害具有指示意义。
2
Through investigate the species of zooplankton and phytoplankton and distribution of hygrophilous vegetation in Fu River's headstream, we evaluate the ecological environment in Fu River's headstream.