摘要
林分直径结构是林分内各种大小直径林木的分配状态,它是最基本也最重要的林分结构。了解林分的直径结构,也就对单木生长以及林分竞争所产生的结果有了清楚的认识;探讨林分直径结构动态变化规律更是有利于揭示林分发展规律的实质[1]。本研究以木兰林管局孟滦林场华北落叶松白桦混交林为研究对象,采用标准地调查法对林内胸径大于3cm的林木进行每木检尺,并使用Forstat2.1统计软件对主要树种直径结构分布规律进行研究,研究发现,各树种处于中间径阶的林木株数最多;小径阶林木较少,林分更新较差;综观拟合效果,正态分布、伽玛分布、对数正态分布、二项分布以及泊松分布更能反映出林分的直径分布规律。
Stand diameter structure, as the most basic and important stand structure, means the distribution status of all kinds of trees with different diameters in a stand. The knowledge of the stand diameter structure is to clearly understand the results from single wood growth and stand competition. The research on the rules of dynamic changes of stand diameter structure will contribute more benefits to revealing the essence of stand development rule. The article investigates all the plants with~ 3 cm DBH in the mixed forest of Larix Principis-rupprechtii Mayr. and Betula platyphylla Suk. in the Mengluan Forestry Farm, Mulan Forestry Administration as research object by using sample plot method, and analyzes the distribution characteristics of diameter structure of main tree species with the statistical software Forstat2.1. The statistic analysis shows the largest number of trees appears in the middle diameter class and the smaller number of trees in the small diameter class, with poor stand regeneration. Based on the integrated effect of normal distribution, gamma distribution, logarithmic normal distribution, binomial distribution and Poisson distribution, the forest diameter distribution law is supposed to be better reflected.
出处
《河北林果研究》
2012年第4期375-379,共5页
Hebei Journal of Forestry and Orchard Research
基金
科技部十二五科技支撑计划(2012BAD22B0304)
国家公益专项(20100400205)
关键词
孟滦林场
华北落叶松
白桦
直径结构
Mengluan Forestry Farm
Larix principis-rupprechtii Mayr.
Betula platyphylla Suk.
diameter structure
