摘要
通过对云南松毛虫采用人工模拟摘叶和实际放虫危害测试,找到了松针损失量与树高、胸径和材积生长之间的关系,并通过F、q检验,组建了胸径(X)与针叶量(Y)回归方程为Ye=2 987 91X - 112 4 5 7;采用产投比法和经济阈值法,建立了第1代和越冬代防治指标:Y =2 3981X - 9 0 2 5 8,Y =5 0 72 2X - 19 0 9。
By artificial imiataion of pine needle picking,and really harm of larva putting,on the basis of artificial imitation of pine needle picking,we-found the relationship between the volume of pine needle losing and height,chest height diameter and volume growth of pine tree.By F,q-test,we set the regression linear equation of chest height diameter(X) and pine needle volume(Y)as Ye= 2 987.91 X-11 245.7,with input-output analysis method and economic threshold method,we set the control index of first control index of wirter generation as Y=5.0722X-19.09.
出处
《林业科技》
北大核心
2005年第2期21-24,共4页
Forestry Science & Technology
