摘要
在曲靖市海寨林场遭华山松木蠹象危害的华山松林分内设样地并作解析木观测 ,结果表明 ,华山松木蠹象危害指数与华山松材积损失率间有明显的相关关系 ,其相关关系可用一元回归方程表示为 :Y =- 0 3986 5 4+0 0 5 5 90 8X (X为华山松木蠹象危害指数 ,Y为华山松材积损失率 )在此基础上 ,考虑不同的立木生长量、木材价格、防治费用和防治效果 ,进一步推算出华山松木蠹象防治指标的动态模型为 :XET={〔10 0C/ (DⅹJⅹE)〕 +0 3986 5 4} / 0 0 5 5 90 8(C为防治费用 ,D为对照单位面积材积 ,J为木材价格 ,E为防治效果 ) 。
Sample plots of Pissodes yunnanensis harmed stands and analytic trees were studied.The results indicated the obvious correlation between the harm indey of Pissodes yunnanensis and volume loss rate of Pinus armandii.This correlation could be expressed by a regression equation with one unknown quantity,Y=-0 398 654+0 055 908X,X was harm index of Pissodes yunnanensis,Y was volume loss rate of Pinus armandii.The comprehensive consideration of the correlation,amount of growing stock,timber price,control expense and effect indicated the dynamic mode of Pissodes yunnanensis control,X ET =｛[100C/(D×J×E)]+0 398 654｝/0 055 908.C was control expense,D was volume per unit area of control,J was timber price and E was control effect.The establishment of the mode provided a scientific basis for integrated control of Pissodes yunnanensis.
出处
《云南林业科技》
2001年第1期51-53,共3页
Yunnan Forestry Science and Technology
基金
云南省重点基金项目! (C 95 0 0 4Z)
关键词
华山松木蠹象
一元回归
防治指标
Pissodes yunnanensis Langer,Situ et Zhang,regression equation with one unknown quantity,control threshold value
