大螟和黄螟在蔗苗上的生态位及其种间竞争
The ecological niches of Sesamia inferens Walkerand Argyroploce schistaceana Snellen and their interspecific competition on sugarcane
罗志明 申 科 黄应昆** 李文凤 尹 炯 张荣跃 王晓燕 单红丽
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DOI：
作者单位：云南省农业科学院甘蔗研究所，开远 661699
中文关键词：大螟，黄螟，种群动态，生态位，种间竞争
英文关键词：Sesamia inferens Walker, Argyroploce schistaceana Snellen, population dynamics, niche, interspecific competition
中文摘要：
【目的】 明确大螟Sesamia inferens Walker和黄螟Argyroploce schistaceana Snellen在甘蔗上的生态位和种间竞争关系。【方法】 通过对甘蔗苗期螟害枯心苗和螟幼虫调查，根据生态位理论测定其生态位和种间竞争强度。【结果】 甘蔗苗期，大螟60%以上由蔗苗地上部位蛀入，黄螟90%以上由蔗苗地下和地面部位蛀入。在生态位方面，大螟时间生态位较黄螟宽，空间生态位则两种害虫相当，生态位相似性比例较高，种间竞争系数最高达0.7472。【结论】 这两种害虫在蔗苗上竞争激烈。
英文摘要：[Objectives] To determine the ecological niches of Sesamia inferens and Argyroploce schistaceana and the level of interspecific competition between these species on sugarcane. [Methods] Dead sugarcane hearts caused by S. inferens and A. schistaceana were investigated at the seedling stage. The ecological niches and interspecific competition of these two species on sugarcane were determined based on niche theory. [Results] Over 60% of S. inferens larvae bored aboveground parts of sugarcane seedlings whereas over 90% of A. schistaceana lavae bored underground and surficial sites. S. inferens had a broader temporal niche breadth than A. schistaceana, and had a spatial niche breadth equivalent to that of A. schistaceana. A high niche similarity was found between S. inferens and A. schistaceana. The highest interspecific competition coefficient was 0.7472. [Conclusion] There is intense interspecific competition between S. inferens and A. schistaceana on sugarcane seedlings.