摘要
根据黑龙江省、市、县576块水曲柳固定样地的解析木数据,在水曲柳单木直径生长模型中引入林木大小、竞争和立地条件因素,采用回归的方法建立水曲柳单木直径生长模型。研究表明:水曲柳单木生长模型与该林木自身的大小(lnD)、林分平均胸径(Dg)、对象木直径与林分中最大林木直径之比(DDM)以及土壤有较大的关系。林木的直径越大其生长量越大;竞争因子DDM说明水曲柳单木直径越大;其定期生长量越小;立地因子土壤表明,土层越浅其生长的越快。模型的检验精度为94%,说明模型具有良好的拟合效果,可用于实际的生产中。
According to the data of 576 Manchurian ash permanent plots in Heilongjiang province,the growth model of single tree diameter of Manchurian ash was established using stepwise regression method by introducing tree sizes,competitive status and site condition into the model.Research results show that the size of each single tree（lnD）,stand average diameter（Dg）,the ratio of diameter of subject tree with the maximum tree diameter in stand（DDM）and soil have a significant influence on the individual tree growth model.The larger the diameter is,the greater the growth is.Competitive factor DDM shows that the larger the diameter is,the smaller its regular growth is.Soil site factors indicate that the tree grows faster in more shallow soil.Test accuracy of the model is 94%,indicating that the model has a good fitting result and can be used in actual production.
出处
《森林工程》
2011年第3期5-8,共4页
Forest Engineering
基金
林业公益性行业科研专项(201004026)
中央高校基本科研业务专项(DL09BA10)
关键词
水曲柳
单木生长模型
直径生长量
模拟
Manchurian ash
individual tree growth model
diameter increment
simulation
