论文部分内容阅读
准确测定林木生长量,对于掌握林木生长规律,合理确定森林经营利用措施及编制林业计划起到重要的作用。为此,我们于1966年在五常县,结合森林资源抽样调查,在全县范围内系统地抽取226株山杨、207株椴树和180株柞树进行了分析。一、样木的抽取在142,088公顷有林地上,每隔3公里设置样地。样地半径为20米的圆形临时样地。在样地内,每个树种找3株离样地中心点最近的树木做为样木。
Accurate determination of forest growth, for mastering the law of forest growth, a reasonable determination of forest management and utilization of forestry planning and preparation plays an important role. To this end, we in Wuchang County in 1966, combined with sampling of forest resources, within the county-wide extraction of 226 aspen, 207 strains of linden trees and 180 trees were analyzed. First, the sampling of wood in 142,088 hectares of forest land, set a sample every 3 km. Sample a radius of 20 meters of circular temporary plots. In the sample plot, three species of each tree were selected as the sample trees with the closest center to the sample plots.