江西省上阔下竹复合系统类型调查与分析

基于江西省毛竹林经营现状，调查分析了竹阔混交林分中山顶阔叶林与山体中下部毛竹纯林所构成的复合系统（简称"上阔下竹"）特征及其对毛竹林生长指标的影响。结果显示：江西上阔下竹系统可分为4种类型，分别为高阔中海拔陡坡多石型、中阔低海拔缓坡中石型、低阔低海拔缓坡少石型、低阔中海拔斜坡中石型，其中以中阔低海拔缓坡中石型生物多样性最为丰富、竹林生物量也最高。各类型系统中上位阔叶林树种多样、层次分明、生物多样性丰富，有利于提高林分的生态安全。同时，上位阔叶林能有效保持林地水分和养分并供给下位毛竹林，促进毛竹生长，提高毛竹林的胸径和生物量。

Investigation and Analysis on the Types of Mixed Forest with Broad Leaf Forest on the Upper Slope and Bamboo on the Lower Slope in Jiangxi Province

With an eye to the current situation of moso bamboo forest management in Jiangxi Province, the paper investigates and analyzes the characteristics of the mixed forest with broad-leaf forest on the upper slope and moso bamboo pure forest on the lower slope as well as its influence on the growth of bamboo forest. The results show that there are 4 types of such mixed forest in Jiangxi Province, including the upper broad-leaf forest growing on middle-altitude steep and rocky slope, the middle broad-leaf forest growing on low-altitude slow and less rocky slope, the lower broad-leaf forest growing on low-altitude slow and least rocky slope and the lower broad-leaf forest growing on the middle-altitude less rocky slope, among which the second type has the richest biodiversity and highest bamboo biomass. In all the types, the broad-leaf forest on the middle and upper part has the diverse species, the clear tree hierarchy and abundant biodiversity, which is conducive to improving the ecological security of forest stands. Meanwhile, the upper broad-leaf forest can effectively maintain the water and nutrients of the forest land, and supply the moso bamboo forest below to promote the bamboo growth and increase the BDH and biomass of the bamboo forest.