Soil Structure Characteristics and Comprehensive Evaluation of Different Phyllostachys edulis Forests in Anfu,Jiangxi Province

Five kinds of stand type(Pure Moso bamboo forest,mixed forest of Moso bamboo and broad-leaved tree,mixed forest of Moso bamboo and Chinese fir,broad-leaved forest,Chinese fir pure forest) had been chosen at Anfu,Jiangxi province.Through the study on soil structural characteristics,such as soil bulk density,soil porosity condition,and content,size,stability of soil aggregate were exposed.Finally,soil structural was comprehensive evaluated by grey correlation degree analysis.The results showed that the order of soil bulk density was mixed forest of Moso bamboo and broad-leaved forest pure Moso bamboo forestmixed forest of Moso bamboo and Chinese fir broad-leaved forest Chinese fir pure forest;soil porosity condition manifested as broadleaf forest is superior to Chinese fir pure forest,Moso bamboo forest is relatively poor.0.25 mm soil aggregates content from 94.43% to 97.25%,broadleaf forest were the largest in all soil layers.The order of soil aggregates fractal dimension mean was pure Moso bamboo forest mixed forest of Moso bamboo and broad-leaved tree mixed forest of Moso bamboo and Chinese fir Chinese fir pure forest broad-leaved forest.The soil MWD and GMD of different stand types were difference.The soil MWD and GMD mean of mixed forest of Moso bamboo and broad-leaved forest and mixed forest of Moso bamboo and Chinese fir were increased by 3.38%,4.10% and 5.04%,8.11%,respectively.The order of index grey correlation degree of soil structure were broad-leaved forest Chinese fir pure forest mixed forest of Moso bamboo and broad-leaved forest mixed forest of Moso bamboo and Chinese fir pure Moso bamboo forest by grey correlation degree analysis.The results could provide some scientific basis for forest resources management and vegetation construction in the subtropical region of China.