摘要
以可持续发展为目标，应用国内外先进的数学方法和微电脑运算，可靠、准确、快速地研究了林分结构规律以及进行弱度抚育以后，在生长规律及综合效益方面所呈现出的良好状态。即在１０％的弱度抚育下，林内径级结构正向合理的趋势发展，林分定期胸径平均生长量西营河增长了８６．５９％、哈溪增长了６９．２０％；材积定期平均生长量西营河增长了８４．８５％、哈溪增长了６５．３３％。西营河抚育后的年平均材积生长率由抚育前的２．３３％提高到４．１７％。研究表明，合理的抚育强度应为１５—２０％，合理的采伐周期应为１５年，森林学效率为４１．７６％，经济效率为２３９．４３％，抚育采伐取得了良好的效益。
Regarding sustainable development as the goal of forestmanagement,and adopting some advanced mathematic methods and microco-mputer in processing data,this paper dealed with the stand structure ofwater conservation forest in Qilian Mountains, and the ideal changes in thelaw of forest increment and integrative effects of those stands since it weretel1ded lightly. The results indicated that under light tending felling at 10%,the size-class composition has been showing a tendeney to develope reason-ably;the mean increment of periodic al diameter breast height has increasedby 86.59%in Xiyinghe working-area and by 69.20%in Haxi working-area;the mean ertorowth of periodical volume has increased by 84.85%in Xiyingheand by 65.33%in Haxi;the mean annual volume growth rate has increasedfrom 2.33%before tending to 4.17%after tending. Itwas revealed that thereasonable intensity of tending felling should be 15 20%and the reasonablefelling;cycle should be l5 years;by means of tending,the forestry effici-ency reached 41.76%and economic efficiency got to 239.43%。It has fullyproved that tending felling has brought about ideal and fine effects.
出处
《甘肃林业科技》
1996年第1期1-5,共5页
Journal of Gansu Forestry Science and Technology
关键词
水源林
综合培育
经营决策
祁连山
Qilian Mountains Water conservation forest Integratedimprovement Management dicision
