贵州马尾松天然林蓄积相关因子的主成份分析  

Principal Component Analysis on Factors of Growing Stock in Natural Pinus massoniana Forests in Guizhou Province

作　　者：杜明凤[1,2] 李明军[2,3] 郭颖 

机构地区：[1]贵州师范大学中国南方喀斯特研究院,贵州贵阳550003 [2]贵州大学林学院,贵州贵阳550025 [3]贵州省林业调查规划院,贵州贵阳550003

出　　处：《浙江林业科技》2015年第4期47-51,共5页Journal of Zhejiang Forestry Science and Technology

基　　金：贵州省林业调查规划院森林生态监测评估院士工作站项目(黔科合院士站〔20134004);贵州省森林资源监测与评价科技创新人才团队项目(黔科合人才团队〔2013〕4007)

摘　　要：利用第八次国家森林资源连续清查贵州省第六次复查(2010年)资料,从中提取223块马尾松(Pinus massoniana)天然林样地数据,通过主成份分析和多元回归分析其林分蓄积的相关因子。结果表明:中心区特征值大于1的有2个公因子,累积贡献率71.645%,第一公因子方差贡献率为42.204%,包括平均胸径、平均树高、平均年龄,定义为林分基本因子,第二公因子方差贡献率29.441%,包括郁闭度和林分密度,定义为林分密度因子;一般区特征值大于1的有3个公因子,累积贡献率81.620%,第一、二公因子的定义与中心区一致,其方差贡献率分别为35.997%和28.003%,第三公因子为土壤类型,定义为立地条件因子,其方差贡献率为17.620%;多元回归建模并对其进行T检验发现,中心区结果与因子分析结果一致,一般区与因子分析结果有差异。综合表明,中心区和一般区林分蓄积的相关因子均是平均胸径、平均树高、平均年龄、郁闭度和林分密度,其他因子对林分蓄积的影响较小。Based on data of the 8th continuous inventory for national forest resources in 2010 in Guizhou, growing stock factors of 223 sample plots of natural Pinus massoniana forest were analyzed by principal component and multiple linear regression analysis. The results demonstrated that there were two common factors with the eigenvalue more than 1 in the central area, whose accumulative contribution rate 71.645%. The first common factor was composed by mean DBH, height and age with variance contribution rate of 42.204%. The second one was composed by canopy and stand density with variance contribution rate of 29.441%. There were three common factors with the eigenvalue more than 1 in ordinary area, whose accumulative contribution rate was 81.620%. The first and second common factor was the same as that in the central area, with variance contribution rate of 35.997% and 28.003 %. The third common factor was soil type, with variance contribution rate of 17.620%. Modeling by multiple linear regression and t-test resulted that it had the same conclusion in the central area with principal analysis. The conclusion showed that the related factors of growing stock were mean DBH, height, age, canopy and stand density in the central and ordinary area, while the other factors had less influence ongrowing stock.

关 键 词：马尾松 天然林 林分蓄积 主成份分析 多元线性回归 

分 类 号：S791.248[农业科学—林木遗传育种]