纳板河流域不同森林类型林分直径分布结构特征研究

Stand Diameter Distribution Characteristics of Different Forest Types in Nabanhe Basin

在纳板河流域的5种森林类型中设置大样地14块,采用负指数函数模型和q值分布函数,研究不同森林类型的林分直径分布结构特征,以此探究纳板河流域森林群落的生长状况。结果表明,整个流域中的森林群落拟合模型均表现出近似双曲线形式中的局部反“J”型曲线形式,大量林木直径分布在10径阶,不同森林群落的负指数拟合效果较好,其中拟合效果最好的为季风常绿阔叶林。从a值、k值、q值的测算结果得出森林群落次生能力由强到弱的顺序为热带雨林群落、热带季雨林群落、季风常绿阔叶林群落、山地雨林群落、落叶阔叶林群落。

The 14 sample plots were set up in five forest stands in Nabanhe basin to investigate the diameter distribution structure of different forest types by the distribution function of q value and the model of negative exponential function to study the growth status of forest communities. The results showed that the forest community fitting model in the whole basin presented the local inverse “J” curve form similar to hyperbolic form with a large number of trees of 10cm in diameter, and the negative index fitting effect of different forest communities was good, among which the monsoon evergreen broad - leaved forest had the best fitting effect. It can be concluded by the values of A,K and Q that the order of secondary capacity of forest community from strong to weak was tropical rainforest community,tropical monsoon forest community,monsoon evergreen broad - leaved forest community,mountain rainforest community and deciduous broad - leaved forest community.