摘要
本文用聚集度指标,Iwao m-m回归以及Taylor的幂法则研究了苹果树上山楂叶螨若螨的多维空间格局及其时序动态,考察了若螨个体聚集与扩散的趋势。根据空间格局的信息,得到了若螨在苹果树上、中、下三层树冠的资料代换公式及理论抽样数模型。研究结果表明:若螨在苹果树上、中、下三层树冠的空间格局均属聚集型,其原因主要是由于环境的作用引起的,但也不能完全排除由于若螨本身聚集习性的缘故。
The spatial pattern of the hawthorn spider mite nymphs on apple trees and their timedynamics were studied by aggregation indexes and Iwao's m-m regression and Taylor's powerlaw, and the tendency of aggregation or dispersion of the nymphs were studied by thd indexes ofm and m/m in this paper. Based on the information of the spatial pattern, the transformation ofthe data and the models of theoretical sampling amounts of the nymphs were determined. Theresults showed that the spatial pattern of the nymphs on apple tree was an aggregate pattern,suggesting the impact of environment factors and the aggregating habits of the nymphs.
出处
《安徽农业大学学报》
CAS
CSCD
1993年第3期234-239,共6页
Journal of Anhui Agricultural University
关键词
苹果树
山楂叶螨
空间格局
Hawthorn spider mite
Spatial pattern
Time dynamics
Data transformation
Theoretical sampling amounts
