喀斯特地区阔叶混交林蓄积的相关因子研究

Study on related factors of stand volume of broadleaved mixed forest in karst district

利用两期贵州森林资源连续清查数据资料（2000~2010年）,通过主成份法和多元回归研究贵州阔叶混交林林分蓄积与各因子的相关性。结果表明：非喀斯特林区特征值大于1的有2个公因子,累积贡献率66.392%;第一公因子贡献率为48.255%,包括平均胸径、平均树高、郁闭度、坡度、海拔,定义为林分及环境因子;第二公因子是林分密度,定义为密度因子,贡献率18.137%。喀斯特林区特征值大于1的有2个公因子,累积贡献率63.708%;第一公因子贡献率为45.675%,包括平均胸径、平均树高、郁闭度、坡度、林分密度,定义为林分因子;第二公因子土壤类型,定义为土壤因子,贡献率为18.034%。多元回归建模和T检验结果表明,喀斯特或非喀斯特阔叶混交林的蓄积相关因子均包括平均胸径、平均树高、郁闭度和林分密度;此外,非喀斯特区林分蓄积相关因子还包括海拔、坡度。该结论为贵州阔叶混交林区资源保护和管理提供了一定的依据。

Based on the forest resources continuous investigation data of Guizhou from2000 to 2010, this study took broadleaved mixed forest as the research object and extracted 586 pieces of sample plots, and the factors related to stand volume were analyzed by the method of principal component analysis and multiple liner regression. There had some results： In no-karst area, two common factors with the eigenvalue more than 1 were selected, and the cumulative variance contribution was 66.392%.The first common factor was composed of height, DBH, canopy density, slope and altitude, which was defined as the basic stand and environment factor with variance contribution of 48.255%. The second common factor was stand density, which was defined as the soil factor with variance contribution of 18.137%. In karst area, two common factors with the eigenvalue more than 1 were selected, and the cumulative variance contribution was 63.708%.The first common factor were defined nearly the same as them in no-karst area, composed of height, DBH, canopy density, slope and stand density, and the variance contribution were 45.675%.The second common factor was soil type, which was defined as soil factor with variance contribution of 18.034%.The multiple linear regression analysis of the modeling samples were conducted, and the findings showed that the related factors of stand volume were height, DBH, canopy density and stand density in no-karst area and karst area of Guizhou province, and slope and altitude was an important related factor in no-karst area. The conclusion provides a foundation for conservation and management about broadleaved mixed forest in Guizhou province.