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一九八一年,在进行江山娇实验林场Ⅱ级森林经理调查的同时,对全场的森林病虫进行了一次普查,为进一步研究松毛虫对林木生长的危害,分别于八二年、八三年又进行了连续观察。其具体作法是:在不同危害程度的落叶松、红松人工林分内按不同立地条件,选设一定数量的标准地,对林分各项因子、立地类型及虫口密度、被害率、危害程度进行了调查,业对有代表性的标准木,进行了伐倒解析。一、调查情况一九八一年,江山娇林场由于松毛虫的大发生,使8640亩的落叶松与15亩的红松人工林受
In 1981, while conducting a survey of Grade II forest managers at Jiaojiang Jiao Experimental Forest Farm, a general survey of forest pests and diseases was carried out. In order to further study the harmful effects of pine caterpillars on forest growth, Three years and conducted a continuous observation. The specific practices are: Larch, Korean pine plantations of different degrees of harm according to different site conditions, the selection of a certain number of standard sites, the stand factors, site types and insect population density, the rate of damage, the degree of harm A survey was conducted and the representative standard wood was analyzed. First, the survey In 1981, Jiangshan Jiao Lin Field due to the occurrence of pine caterpillars, so that 8,640 acres of larches and 15 acres of Korean pine plantation by