摘要
基于广西2005年第8次森林资源连续清查数据,以马尾松人工林为研究对象,从中提取306块样地。采用DPS软件的因子分析法,分析了9个因子对其林分蓄积的影响。按照累积方差贡献率大于80%,特征值靠近或大于1的原则提取出5个公因子。结果表明:在马尾松人工林中,第2公因子为平均年龄、平均胸径和平均树高,可将其定义为林分基本因子;第2公因子为郁闭度和样木总株数,可定义为林分密度因子;第3公因子为土层厚度,可定义为立木生境因子,第4、5公因子分别为坡位和坡向,可将其统一定义为林地方位因子。最后对建模样本进行多元线性回归分析,并经验证其结果符合因子分析法结果。综合表明,在马尾松人工林中,对林分蓄积量增长作用最大为林分基本因子,其次是林分密度因子和立木生境因子,林地方位因子对林分蓄积的影响较小。该结论为广西马尾松人工林种植和经营措施的采取提供了一定的依据。
Based on the 8th forest resources continuous investigation data of Guangxi in 2005, and by taking Pinus massoniana Lanb. （P sinensis Lamb） artificial forest as the research object and extracting 306 pieces of sample plots, and by using technique of factor analysis of DPS, the effects of the nine factors affecting the stand volume were analyzed. In accordance with the basic principles that the rate of cumulative variance contribution should be more than 80% and the characteristic value should be close or greater than 1, five common factors were extracted. The results show that the for P massoniana artificial forest, the first common factor was age, DBH and height, it could be defined as basic stand factor; The second was stand density and the total number of sample trees, it could be defined as stand density factor; The third was elevation and soil thickness, it could be defined as standing trees＇ biotope factor; The fourth and fifth common factors were slope position and aspect, both which can be defined as the woodland orientation factor; Finally, the multiple linear regression analysis of the modeling samples were conducted, and the analysis results were verified and were consistent with the results of factor analysis. The findings show that the greatest effecting role to stand volume growth was basic stand factor, followed by stand density factor and standing trees＇ biotope factor, the woodland orientation factor had less influence on stand volume growth. The conclusion provides a foundation for cultivation and choice of management measures about P. massoniana artificial forest in Guangxi province.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2014年第11期32-36,共5页
Journal of Central South University of Forestry & Technology
基金
948计划资助(2013-4-63)
国家林业局公益性行业科研专项(200804006)
南京林业大学科技创新基金(CX2011-24)
关键词
马尾松
森林资源连续清查
林分蓄积
因子分析法
多元线性回归
Pinus massoniana
continuous forest inventory
stand volume
factor analysis
multiple liner regression
