高羊茅草坪草间小黑蛛水平分布格局研究

Study on Horizontal Distribution Pattern of Erigonidium Gram Inicola Population in Tall Fescue Turf

研究了高羊茅草坪草间小黑蛛的水平分布格局,采用聚集强度的5种指数测定其空间格局。结果显示:①聚集强度指数为扩散系数C>1,久野指数CA>0,丛生指数I>1,聚块性指数Iw>1,负二项分布中的K>0,表明草间小黑蛛在高羊茅草坪水平分布为聚集格局。②通过Iwao和Taylor的线性回归分析方法得出了草间小黑蛛种群空间格局的特性为聚集型,且个体间相互吸引。

Systematic studied on the spatial distribution pattern of Erigonidium gram inicola population in Tall Fescue Tuff, five aggregation indices was used to analyze the horizontal distribution pattern. The results showed： （1）diffused coefficient C 〉 1, Kuno index CA 〉 0, clump intensity index I 〉 1, swarm index Iw 〉 1, K 〉 0（ K value in negative binomial distribution model）, these results showed that Erigonidium gram inicola population had aggregated in horizontal distribution pattern. （2）The analysis of Iwao＇ s patchiness and Taylor＇ s law showed that Erigonidium gram inicola population was in the spatial pattern of aggregation distribution, with a group of individuals as a unit.