人工落叶松与天然水曲柳混交林中树种关系的定量分析

QUANTITATIVE ANALYSIS FOR INTERSPECIFIC RELATIONSHIP OF A STAND MIXED LARCH WITH ASH

以东北林业大学帽儿山实验林场老爷岭生态站11林班次生林区撂荒地上人工栽植的落叶松与天然侵入的水曲柳混交林为研究对象,在所设置的固定标准地内,分别以落叶松、水曲柳和其它阔叶树为目的树,调查半径1～6m内树木的株数和胸径;并以每株树为圆心测定最近8株树之间的距离、胸径和冠幅,获得基本数据。应用Alemdag模型计算竞争指数,并用方差分析和数量化模型方法进行了分析。结果表明,落叶松的种内竞争大于种间竞争,且落叶松与水曲柳之间的竞争相对最小。就试验地的条件而言,在20～30年生时每公顷保留2800株左右,落叶松与水曲柳混交比以2∶1为宜,这样不仅可以改善林地条件,而且可以提高林分生产力。

Fixed sample plots were set up for researching interspecific relationship of the artifical larch stand mixed with natural ash in the slash site in Maorshan Experiment Forestry Farm of Northeast Forestry University. All trees in the plots were taken as objective trees,and tree number and diameter breast height and distance between trees and crown diameter were measured in range of 1～6m from every objective tree. Then study by Alemdag competitian index,variance analysis and quantitation method were made. The result showed that the intraspecific competition was more intensive than the interspecific competition. Especially the competition between larch and ash was the least relative. For these kinds of site, the suitable mixture at 20-30 ages should be 2800 ind/hm^2 of density and 2 larch:1 ash of mixing radio,which might improve site condition to promote stand productivity.