大兴安岭中段针阔混交林林分空间结构研究

Study on Spatial Structure Characteistics of Coniferous Broad-leaved Mixed Forest in Central Region of Daxing'anling Moutains

大兴安岭中段森林曾经是内蒙古采伐强度最高的区域之一,通过天然林恢复以及"天保工程"的实施,森林质量得到一定程度的改善。以兴安盟五岔沟林场为研究对象,采用大样地调查法,设置面积为8.8hm2的针阔混交林样地,利用软件Winkelmass 1.0进行数据分析,对混交度、大小比数和角尺度3个空间结构参数进行研究。结果表明:1)该研究区树种所占比例从高到低排序为黑桦(52%)、兴安落叶松(17%)、白桦(17%)、蒙古栎(14%),以落叶阔叶林为主;2)整体林分大小分化差异较大,兴安落叶松为优势种,但数量少且混交度差,分布集中;3)整体林分空间分布较合理,接近随机分布。研究结果可为大兴安岭中段林区的经营管理以及人工抚育提供数据依据。

Forest in the central region of Daxing’an mountains was one of the highest cutting intensity in Inner Mongolia. Through the self recovery of natural forest and implementation of the “natural forest protection project”,the forest quality is improved to a certain extent. With Wuchagou Forest Farm in Xingan league as the research object,the sample survey method was used,the sample plot of 8. 8hm^2 set up in coniferous broad-leaved mixed forest,data were analyzed using Winkelmass 1. 0,study on three of spatial structure parameter,named mingling intensity,neighborhood comparison and uniform angle index. Results show that：1. The regional species proportion from high to low order is Betula davurica（52）%,Larix gmelinii（17%）,white birch（17%）,Quercus mongolica fisch（14%）,minly for deciduous broad-leaved forest. 2. There was big difference in differentiation,dominant sociales is Larix gmelinii,but it is small in number and poor in mixed ability,the distribution is very concentrated. 3. The spatial distribution is reasonable,close to random distribution.