Since forestation of pure forest of Pinus massoniana is liable to suffer from pest calamity, soilerosion, decrease of soil fertility, and difficulty in wood production in the hilly areas of southern China, weconducted...Since forestation of pure forest of Pinus massoniana is liable to suffer from pest calamity, soilerosion, decrease of soil fertility, and difficulty in wood production in the hilly areas of southern China, weconducted an investigation on the three types of forests in Gaoan County of Jiangxi Province, namely, thepure forest of Pinus massoniana, the pure forest of Schima superba, and the mixed forest consisting of thetwo species, setting up standard stand, measuring and studying the growing stock, biomass, leaf area, roots,soil, vegetation, pests, litters, soil erosion, microclimate, etc., with the following results. ① The averageheight, diameter at chest height, and volume of the mixed forest are higher than those of the pure forest ofPinus massoniana by 30.9%, 31.7% and 10.6%, respectively. ② The biomass of the mixed forest is 2.24times as much as that of the pure forest of Pinus massoniana. ③ The litters of the mixed forest is 3.37 timesand 1.96 times as much as the litters of the pure forest of Pinus massoniana and the pure forest of Schimasuperba respectively. ④ The occurrence of pest calamity per tree is lower and the conditions of soil erosionand microclimate are better than those of the pure forest of Pinus massoniana. ⑤ The mixed forest of the twospecies is an excellent mixed type of needle-leaf and deciduous forest worth being popularized in Chinassubtropical areas, especially in the low hilly areas. It is recommended in plantation that the mixed patterns bebetween trees, lines, small blocks, or scattered-dots, the ratio of mixture of Pinus massoniana and Schimasuperba be 5 to 1, or 3 to 1, and the initial space between trees be 1.2, 1.5, or 2.0 m while the initial densitybe 6 944 to 4 440 trees per square hectare.展开更多
文摘Since forestation of pure forest of Pinus massoniana is liable to suffer from pest calamity, soilerosion, decrease of soil fertility, and difficulty in wood production in the hilly areas of southern China, weconducted an investigation on the three types of forests in Gaoan County of Jiangxi Province, namely, thepure forest of Pinus massoniana, the pure forest of Schima superba, and the mixed forest consisting of thetwo species, setting up standard stand, measuring and studying the growing stock, biomass, leaf area, roots,soil, vegetation, pests, litters, soil erosion, microclimate, etc., with the following results. ① The averageheight, diameter at chest height, and volume of the mixed forest are higher than those of the pure forest ofPinus massoniana by 30.9%, 31.7% and 10.6%, respectively. ② The biomass of the mixed forest is 2.24times as much as that of the pure forest of Pinus massoniana. ③ The litters of the mixed forest is 3.37 timesand 1.96 times as much as the litters of the pure forest of Pinus massoniana and the pure forest of Schimasuperba respectively. ④ The occurrence of pest calamity per tree is lower and the conditions of soil erosionand microclimate are better than those of the pure forest of Pinus massoniana. ⑤ The mixed forest of the twospecies is an excellent mixed type of needle-leaf and deciduous forest worth being popularized in Chinassubtropical areas, especially in the low hilly areas. It is recommended in plantation that the mixed patterns bebetween trees, lines, small blocks, or scattered-dots, the ratio of mixture of Pinus massoniana and Schimasuperba be 5 to 1, or 3 to 1, and the initial space between trees be 1.2, 1.5, or 2.0 m while the initial densitybe 6 944 to 4 440 trees per square hectare.
