落叶松落叶病的生态因子及其生态模型的研究

RESEARCH ON THE ECOLOGICAL FACTORS AND ECOLOGICAL MODELL OF LARCH NEEDLE CAST

通过１９８７－１９９１年在吉林省磐石等３个县（市）１７个林场３００余块长白落叶松（Ｌａｒｉｘｏｌｇｅｎｓｉｓ）人工林标准地调查、定点现实试验和统计分析表明，落叶松落叶病（ＭｙｃｏｓｐｈａｅｒｅｌｌａＬａｒｉｃｉ－ｌｅｐｔｏｌｅｐｉｓ）的林分病情指数与林分密度、林分类型、平均枝下高、土壤种类、林龄和林分地形有密切关系；对１９９０年１０３块标准地的数量化理论１分析，其偏相关系数分别为０．７２３、０．６０５、０．６２７、０．３２３、０．６３４、０．４２６，复相关系数为０．９１９．标准差为０．９４，由此确定落叶松落叶病的生态模型为Ｙ＝１５－２３Ｃ＿（１１）－１５Ｃ＿（１２）－Ｃ＿（１３）＋２１Ｃ＿（２１）＋６Ｃ＿（２２）＋９Ｃ＿（２３）＋１９Ｃ＿（３１）＋９Ｃ＿（３２）＋８Ｃ＿（４１）＋３Ｃ＿（５１）＋１９Ｃ＿（５２）－１０Ｃ＿（６１），式中Ｙ为林分病情指数，Ｃ＿（１１）－Ｃ＿（６２）为林分生态因子（水平）。并由此确定了落叶松落叶病林分病情的预测预报技术和营林、造林控制技术。

rom 1987 to 1991.an intensive investigation on the ecology of Larch leaf cast was madein 17 forest farms of Panshi and two other counties in jilin province. The data analysis ofthree hundred plots of larch plantations Larix olginsis revealed that the disease index of larchneedle cast had a close relation with density. type,height of clearance, soil, age and topogra-phy.The ecological model of larch needle cast was thus tstablished as follows:Y=15-23C_(11)-15C_(12)-C_(13)+21C_(21)+6C_(32)+9C_(23)+19C_(31)+9C_(32)+8C_(41)+3C__(51)+19C_(52)-10C_(61) where Y stands for the forest disease index,and C_(11)-C_(62) stands for forest ecological factors(Levels).Based on the above model, model, a technique for forcasting the disease index of Larchplantations and for larch leaf cast management was developed in this paper.