基于土壤因子的近天然落叶松云冷杉林枯损模型研究

Mortality models of semi-natural larch-spruce-fir( Larix olgensis-Picea jezoensis-Abies nephrolepis) forests based on soil factors

以吉林省汪清林业局金沟岭林场近天然落叶松云冷杉林为研究对象,通过多元线性回归方法,建立了林分单位面积枯损株数与土壤因子、林分密度(SD)和立地指数(SI)的关系,以探索通过枯损模型表征土壤变量对立地条件的影响.结果表明:枯损树木与土壤因子和林分密度可以接受线性回归,全林分枯损模型为Y=838.375-47.810TK+0.343SD(调整R2=0.731),其中落叶松枯损模型为Y=2149.86-81.594TK-314.054TN(调整R2=0.739),而云冷杉枯损模型的拟合优度R2<0.6,说明复杂林分条件下优势树种与共优势树种对于土壤因子的响应与林分不同.

The relationships between the number of mortality trees per umt area and soil factors were studied for semi-natural larch- spruce-flr （Larix olgemis-Picea jezoensis-Abies nephrolepis） plantations in Jingouling forest farm, Wangqing Forestry Bureau, Jilin Province. Mortality models were established using multiple linear regression method to explore the effects of soil factors, stand densi- ty （SD） and site index （SI） on site conditions. The results showed that the linear regression of the number of mortality trees and soil factors could be accepted. Mortality model of the whole stand was Y = 838.375 - 47.810TK ＋ 0. 343SD （ adjusted R2 = 0.731 ） and that of Larix olgemis was Y=2149.86 -81.594TK-314.054TN （adjusted R2 =0.739）, whereas the R2 of mortality model of Piceajazoensis-Abies nephrolepis was less than 0.6. This indicated that the response of dominant and co-dominant tree species to soil factors was different from the whole stand.