红棕象甲幼虫空间格局研究

【背景】红棕象甲是外来危险I生有害生物，近十年来在我国南方严重危害棕榈科植物。方法】为了确定其调查抽样方法、准确获得虫情，应用聚集度指标法和回归模型分析法等，对红棕象甲幼虫的空间格局进行了研究。【结果】在lwao模型中，α=0．4208〉0，β=1.5133〉1，这说明了红棕象甲幼虫的种群空间格局的分布图式为聚集型；用马占山重新解释的Taylor幂法则分析表明，红棕象甲幼虫的空间格局归属于聚集型，个体之间相互吸引。【结论与意义】红棕象甲幼虫在林内呈聚集型分布，分布的基本成分为个体群；运用1wao法确定了林间最适理论抽样数和序贯抽样模型，为该虫的监测与防治提供了依据。

The spatial distribution pattern of Rhynchophorus ferrugineus larvae

Background] Rhynchophorus ferrugineus （Olivier） is an alien and dangerous insect pest, which had been attacking vari- ous palmaceous plants and had led to a vast loss in southern China in the past ten years. Method ] This paper deals with the spatial pattern and relevant parameters in the larval population of R.ferrugineus by means of field investigations, aggregation index and re- gression analysis methods. Result] In the Iwao＇s model, the parameters α=0.4208〉0,β=1.5133〉1, indicated that R.fer- rugineus larvae showed an aggregated distribution pattern in the field. Taylor power law analysis indicated that the larvae spatial pat- tern was aggregated, due to mutual attraction among individuals. Conclusion and significance] R.ferrugineus larvae are highly ag- greagated in the field in China, which requires an optimal sampling and sequential sampling model for field investigations.