影响亚热带东部森林结构的因子分析

Analysis on Factors Influencing the Structure of Forests in the East Subtropical Zone

利用第五次全国资源清查的部分数据 ,在我国亚热带东部地区构造了一条以温度为主要驱动的 ,长约 75 0km、宽约 10 0km ,地跨安徽、江西、浙江、福建、广东五省的平行四边形样带 ,通过对样带内 86 3块样地的胸径变异系数和有关林分因子、环境因子之间的相关分析 ,确定了不同因子对林分结构的影响程度 ,其中 ,林分的平均胸径对林分结构的影响最显著 ,林分密度、海拔高度、坡度、经纬度、土壤厚度等对林分结构也有影响。这些因子最多能够解释整个样带林分结构变化的 35 %。

A 750 km long and 100 km wide transect was established in the east subtropical zone in China, which administratively covering Anhui, Zhejiang, Fujian, Jiangxi and Guangdong provinces. The transect is mainly driven by temperature. The data used here is from the fifth national forest inventory. Correlation analysis between the variation coefficients of stand DBH of 863 plots within the transect and corresponding environmental factors, forest characteristics was conducted to determine the effects of these factors on stand structure. The results indicate that mean stand DBH affects stand structure most. Factors such as stand density, elevation, slope, geographical position of plot, soil thickness also influence stand structure. The multiple linear regression model established with these predictive factors can explain 35% of the total variance of stand structure over the transect.