大兴安岭北部兴安落叶松心材白腐与林龄、密度及环境因子的相关分析

通过对４０块标准地的调查，应用数量化理论Ⅰ，对大兴安岭北部（西林吉、十八站、呼中林业局）兴安落叶松心材白腐（Ｐｈｅｌｉｎｕｓｐｉｎｉ）的病腐株率与兴安落叶松的林龄、密度和地位级、海拔、坡度、坡向等环境因子进行了相关分析。结果显示：大兴安岭北部该病的发病株率与林龄、林分密度、地位级、海拔、坡度和坡向相关（复相关系数Ｒ＝０８２５０）。其中影响发病的主要因子是林龄（ｒ＝０７３９８），其次是海拔和坡向（ｒ＝０３９０５、ｒ＝０３３２６），坡度（ｒ＝０２０９６）、密度（ｒ＝０１２３９）、地位级（ｒ＝０２４８６）与病害发生的关系不大。同时建立了兴安落叶松心材白腐株率与各因子相关关系的数学模型。结果表明控制该病的最有效途径是适时采伐。

Correlation Analysis of Heart White Rot of Larix gmelini and Its Age, Density and Other Environmental Factors in North Daxing'an Mountains

After 40 sample plots surveying in North Daxing'an Mountains (Xilinji, Shibazhan, Huzhong Forestry Bureau), correlation analysis of heart rot (Phellinus pini) rate of Larix gmelini and its age, density, site class, altitude, slope, slope direction was done by using the Quantization Theory I The result was that: rot rate of the tree related with its age, density, site class, altitude, slope and slope direction (R=0 825 0) Age was the main factor related to rot rate (r=0 739 8) Other factors were altitude and slope direction (r=0 390 5, r=0 332 6) Slope (r=0 209 6), density (r=0 123 9), and site class (r=0 248 6) are not closely related to rot rate Correlation model was set up The result showed that the main and the most efficient way to control this disease is to cut the tree in time