番茄刺皮瘿螨空间格局及抽样技术研究

Study on spatial distribution pattern and sampling technique of Aculops lycopersici

调查了不同时期番茄上番茄刺皮瘿螨的数量，采用Waters的负二项K值、Cassie和Kuno的CA值、Daid和Moore聚集度指标I、Lloyd的聚块性指标m^＊／m以及Iwao的m^＊-m直线回归、Taylor幂函数法则分析了番茄刺皮瘿螨的空间分布。结果表明，番茄刺皮瘿螨的空间分布属聚集分布型，其分布的基本成分为个体群；其聚集主要是由昆虫习性和环境因素共同作用所致；根据Iwao-Kuno的理论抽样公式，提出了不同虫口密度下的理论抽样数。

The density of tomato resset mites（A. lycopersici） in different parts of tomato plant at different stages was surveyed and the spatial distribution pattern was analyzed by Waters＇K value of negative binomial,Cassie and Kuno＇s CA value, index of clumping, index of patchiness, Iwao＇s linear regression and Taylor＇s power function. The results indicated that tomato russet mites showed gathering distribution in tomato field, its basic distribution element was individual group, and its group aggregation depended mainly on its habits and environmental factors. A theoretical sampling number for different densities of tomato russet mites was proposed according to the theoretical sampling formula of Iwao-Kuno.