Abstract: In this paper,the spatial distribution pattern of Pontania dolichura larvae was analyzed with Taylor's power law,Iwao's distribution function,and six aggregation indexes.The results showed that the spatial distribution pattern of P.dolichura larvae was of aggregated,and the basic component of the distribution was individual colony,with the aggregation intensity increased with density.On branches,the aggregation was caused by the adult behavior of laying eggs and the spatial position of leaves,while on leaves,the aggregation was caused by the spatial position of news leaves in spring when m＜2.37,and by the spatial position of news leaves in spring and the behavior of eclosion and laying eggs when m＞2.37.By using the parameters α and β in Iwao's m*-m regression equation,the optimal and sequential sampling numbers were determined.

Key words: Landscape ecology, GIS, Landscape analysis system, Patch boundary pixel set