摘要
本文采用比较频次法和聚集度指标法，测定木毒蛾各虫态的分布型。应用Ｉｗａｏ方法，计算各虫口密度下的林间最低抽样数，分析了中幼林中幼虫序贯抽样。研究表明，木毒蛾各虫态（卵块、幼虫、蛹）在木麻黄防护林中呈聚集分布，幼虫以聚集型扩散。幼虫在中低密度下，以对角线和棋盘式取样最佳，卵块以对用线取样最佳。对木毒蛾的防治应以营林措施为基础，坚持生物防治，可以有效地控制其虫口密度。
This
article adopted the comparative frequency method and the crowding level index method to
determine the distribution models of various insect morphologies of Lymantria xylina and
applied the lwao method to calculate the lowest sampling number in the forests under various
population densities and analyze the sequential sampling of larvae in the middle-aged and
young forests.The studies revealed that the various insect morphologies(egg masses. larvae
and pupae)of L. xylina assumed the crowding distribution in the protective forests of Casuarina
and the lar-vae spread by taking the crowding model.Under the middle and low densities,the
diagonal sam-pling and the chequered sampling were optimum for the larvae and the diagonal
sampling was opti-mum for the egg masses. The silvicultural measures should be taken as the
base and the biological control should be upheld for controlling L. xylina and therefore the
population densities could be effectively controlled.
出处
《福建林业科技》
1994年第4期26-34,共9页
Journal of Fujian Forestry Science and Technology
关键词
木麻黄
空间分布型
综合治理
木毒蛾
Lymantria xylian: spatial
distribution models: sequential sampling:comprehensive harnessing
