蓝氏布伦螨Brennandania lambi(Krczal)的菇床分布型及应用

STUDIES ON SPATIAL DISTRIBUTION PATTERNS OF BRENNANDANIA LAMBI (KRCZAL) ADULTS ON MUSHROOM BED AND THEIR APPLICATION

用频次分布比较法、Lwao的回归法、Taylor指数及聚集指数法等确定和判断蓝氏布伦螨成螨在菇床的分布型。15个菇床调查资料表明,该螨在菇床属负二项分布;抽样数量与虫口密度呈幂函数关系,关系式为y=20.04■^(-0.4326)。

This paper deals with the spatial distribution patterns of Brennandani a lambi (Krczal) adults, the most serious mushroom mite, on mushroom bed. The distribution patterns are determined to be fitted by random distribution and negative binomial distribution. Besides, the regression line correlation of the crowded value (m) with the mean ((?)) and that of the 1g variance (s^2) with the 1g mean ((?)), suggested by Lwao (1968) and Taylor (1961) were used for analyzing the aggregate pattern, and several indices were also measured in this respect. The results of determination of the distribution patterns showed that the data of 15 investigated damaged mushroom beds showed negative binomial distribution. According to the relation between the m and the (?) and between the 1g s^2 and the 1g (?), the result showed negative binomial distribution and aggregated pattern. All indices measured indicated that the distribution pattern of B. larnbi adults is of aggregate pattern. The equation of the sampling numbers (y) with the mean ((?)) is y=20.04(?).