摘要
林分密度是指林木生长过程中单位面积上的立木株数,它与林分的生长发育、稳定性、林分产量、质量等因素有着重要的联系。通过对河北省木兰国营林场不同林分密度的华北落叶松人工林进行调查,采用Hegyi单木竞争指数模型,提出了冠幅竞争指数。通过拟合实测冠幅、胸径和相对冠幅竞争指数,得出了竞争指数分别为0.2,0.4,0.6,0.8时,所对应的华北落叶松的不同经营密度值。
Stand density is referred to as the number of trees standing in the process of tree growth on a unit area,which closely related to forest growing conditions,stability,forest yield,quality and other factors.Based on a survey on Larix principis plantations with various densities in State-owned Forest Bureau of Mulan in Hebei Province,the study proposed a competition index of crown width by adopting the Hegyi model,which uses a single wood competition index model to calculate the competition index.By fitting crown width,stem diameter at chest height and relative crown width competition index,the management density was found varying in response accordingly to the diameter,given a competition level.The management densities of Larix principis plantation were calculated for the competition indices of 0.2,0.4,0.6,and 0.8,respectively.
出处
《水土保持通报》
CSCD
北大核心
2011年第3期145-148,共4页
Bulletin of Soil and Water Conservation
基金
国家林业局林业公益性行业科研项目"典型区域森林生态系统健康维护与经营技术研究"(200804022)
关键词
落叶松
竞争指数
林分密度
Larix principis
competition index
stand density
