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依据杨树当年病斑横向宽度与树干长之比和当年材积损失率的相关性,利用模糊聚类分析法中的逐步分析法进行病级比较分析后,提出东北地区杨树烂皮病病级划分标准以划分5个病级为宜。
According to the correlation between the transverse width of the diseased spot of the poplar and the length of the trunk and the loss rate of the volume of the year, using the stepwise analysis method of fuzzy cluster analysis to analyze the disease level, Divide the standard to divide the 5 disease-grade is appropriate.