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“五·六”特大森林火灾后,以云杉小黑天牛Monochamus sutor L.、落叶松八齿小蠢Ips subelongatus Motsch为先锋及优势种的50余种干部害虫先后侵入火烧林分.林分的感虫株率与火烧程度、透光度以及林分中衰弱木、枯立木的数量呈正相关;不同林型干部害虫群落组成及感虫株率有明显差异;人为活动能加剧或控制其发生与为害;各种干部害虫种群数量的急剧增加,引起了对食物资源和营养空间的竞争,导致本代生育率降低,子代成活率下降;随干部害虫种群数量的剧增,其天敌种群数量也迅速增殖,对干部害虫起到了明显的控制作用。
After the “5.6” large forest fire, more than 50 kinds of cadre pests headed by Monochamus sutor L., larch Ips subelongatus Motsch and their dominant species intruded into the forest. The rate of susceptible strains was positively correlated with the degree of fire, the degree of light transmission and the number of dead wood and dead wood in the stands. The composition of the pest community and the rate of susceptible strains were significantly different among different forest types. The human activities could aggravate or control its occurrence And pests; the sharp increase in population of all kinds of cadre pests caused competition for food resources and nutrition space, resulting in the reduction of fertility rate of the present generation and the survival rate of offspring. With the sharp increase in the number of pests of cadres, the number of natural enemy populations It also proliferated rapidly and played a significant role in controlling cadres and pests.