论文部分内容阅读
以夏季的降水量与平均降水量之差的绝对值、林地B层土壤容重、林龄、林分感病指数为杨树烂皮病Valsa sordida Nit的主要测报因子,利用吉林省通榆县向海林场10年生小×黑杨Populus simonii×P.nigra和小青×黑杨P.pseudo-simonii×P.nigra人工林感病指数连续8年的统计数据,微机进行线性回归,建立预测预报回归方程(y=14.8366+1.6673x_1+0.0293x_2-16.1140x_3+1.4257x_4。复数关系数R=0.99>R_(0.05)=0.95,回归剩余标准差SE=2.47)。
Based on the absolute value of the difference between summer precipitation and average precipitation, the soil bulk density, stand age and forest susceptibility index of B layer in forest land were the main measurement factors of Valsa sordida Nit. Hailinchang 10-year-old × Populus simonii × P.nigra and Poplar × Poplar × pseudo-P.pseudo-simonii × P.nigra plantation disease index for 8 consecutive years of statistical data, computer linear regression, the establishment of forecasting regression The equation (y = 14.8366 + 1.6673x_1 +0.0293x_2-16.1140x_3 + 1.4257x_4. The complex correlation coefficient R = 0.99> R_ (0.05) = 0.95, and the regression residual standard deviation SE = 2.47).