soil kind
4.Based on the study of the forest structure laws of the Masson Pine & Broadleaf tree mixed forest ,this essay did the further study on the function of water and soil conservation of this kind of forest so as to provide the reference for the construction of the shelter forest system and the scientific management of Masson Pine & Broadleaf-tree mixed forest.
5.After leaching,soil exchangeable Ca2+(pH2.5),Mg2+,K+,Na+,BS(pH2.5),CEC(pH≥3.5)contents were increased compared with those before leaching,and there existed a good distribution feature with depth of soil layers. Adopt the first kind acidification indexes,the simulated acid precipitation pH 2.5 caused the tested soils acidification;


