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为了估计有林地、疏林地、散生木(包括头状作业的乔木和灌木)树冠的现有光合叶面积以及树冠的光能利用潜力,我们于1980年和1981年在“三北”防护林地区的甘肃省民勤县对二白杨(Populus nigra var.thevestina×P.simonii)和沙枣(Elaeagnus angustifolia)、梭梭(Haloxylon ammodendron)进行了调查研究,现试述于下。一、方法采用典型取样法,伐取样木84株。其中,
In order to estimate the available photosynthetic leaf area of tree canopies of forestland, woodland, and scattered wood (including head-working trees and shrubs) and the light energy utilization potential of the canopy, we conducted a survey in the “Three Norths” shelterbelt area in 1980 and 1981 (Populus nigra var. Thevestina × P. simonii) and Elaeagnus angustifolia and Haloxylon ammodendron in Minqin County, Gansu Province, are described in the following. First, the method using a typical sampling method, cutting sampling wood 84. among them,