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利用设置样地和对照样地的方法,对样地平均木进行树干解析,并调查样地内虫口密度。通过树木的连年生长量来估测落叶松的受害程度及损失大小。
Using the method of setting plots and control plots, the trunk of the plots were analyzed and the population density of the plots was investigated. Through the annual growth of trees to estimate the degree of larch damage and the size of the loss.