Soil Water Retention & Soil Fertility of Mixed Forest of Pinus massoniana

Through experiments on Pinus massoniana mixed with Castanopsis kawakamii ,Cyclobalanopsis myrsinaefolia, Michelia macelurei Cunninghamia lanceolata etc. ,soil water retention,soil structure nutrient at 13-year-old were determined with different mixed forests. Result shows that : saturated water content of mixed forest of Pinus massoniana Castanopsis kawakamii ,mixed forest of Pinus massoniana Cyclobalanopsis myrsinaefolia are more than that of mixed forest of Pinus massoniana Michelia macelurei,mixed forest of Pinus massoniana Cunninghamia lanceolata,soil structure destroy rate of mixed forest of Pinus massoniana Castanopsis kawakamii ,mixed forest of Pinus massoniana Cyclobalanopsis myrsinaefolia are lower;soil porosity of mixed forest of Pinus massoniana Castanopsis kawakamii are the most;soil organic matter,total nutrient content of rapidly available nutrient of mixed forest of Pinus massoniana Castanopsis kawakamii, Pinus massoniana Cyclobalanopsis myrsinaefolia are higher than that of other 2 mixed combinations. Castanopsis kawakamii Cyclobalanopsis myrsinaefolia,which could accelerate water conservation of stand and increase the soil fertility,are associated tree species for Pinus massoniana