【摘要】 分析森林结构可以帮助我们了解森林的发展历史、现状和生态系统将来的发展方向。森林结构在很大程度上是由相邻木之间的空间关系决定的,许多描述森林结构的指标或多或少都与相邻木的关系有关。提出以林分空间结构单元为基础构筑的林分空间结构参数体系应包括描述林木个体在水平地面上分布格局的角尺度,体现树种空间隔离程度的树种混交度,反映林木个体竞争状态的大小比数,以及体现林木密集程度的密集度。这些结构参数已在森林群落结构分析中得到了非常广泛的应用。同时着重论述了林分结构参数大小比数在森林观察研究中的重要性,指出大小比数不仅可以表达天然混交林中树种优势度■、框定林木竞争微环境■,还可以筑构林分优势度■和构造林分空间结构优化目标函数■。最后还对林分空间结构参数的二元分布和二阶特征研究进行了展望。更多还原

【Abstract】 Forest structure analysis can help us understand the history and current situation of forest,even its development and future. The structure of a forest is largely determined by the relationships within neighborhoods of trees,so the description parameters of forest structure is often established on stand spatial structure unit which including those relationships. Such as uniform angle index,mingling,neighborhood comparison,and crowding level,evaluated four spatial characteristics:the horizontal spatial distribution,species mingling,comparative dominance in the size of trees,and crowding degree respectively. These structure parameters have been very widely used in the forest structure analysis. In this paper we focus on the Neighborhood comparison,a very important parameter in forest observation studies,describing species dominance(■)and competition microenvironment of single trees(■) in natural mixed forest,contributing to establish stand integrated dominance(■)and stand spatial structure optimization object function(■). Then both of the bivariate distribution and second-order characteristics of stand spatial structure parameters are introduced in this paper.更多还原