Investigation on the Effect of the Mixed Plantation of Pinus massoniana and Schima superba

In the hilly ground of southern of China,planting pure Pinus massoniana forest has some problems, such as suffering from pest,soil and water erosion,decrease of soil fertility,hard to grow and so on. The pure Pinus massoniana forestpure Schima superba forest and their mixed forest were investigated in Gaoan County of Jiangxi Province. The result showed that:(1)The mean height,diameter and volume of the mixed forest were higher than those of the pure Pinus forests by 30.9%,31.7% and 10.6%,respectively;(2)The mixed forest's biomass was 2.24 times as much as that of the pure Pinus massoniana forest;(3)The litter of mixed forest's was 3.37 times and 1.96 times as much as that of the pure Pinus massoniana forest and pure Schima superba forest;(4)The conditions of pest, soil and water erosion,and microclimax were better than in those pure forests;(5)Pinus massoniana and Schima superba interacted each other, which encouraged them to grow fast.Tree by tree,row by row, block netted and star dotted were successful patterns of mixed plantation,the mixture ratio of Pinus massoniana and Schima superba was 5∶1 or 3∶1; the initial density was from 4446 to 6944 per hectare, the distance between trees or rows was 1.2 m,1.5 m or 2.0 m.