摘要
聚集度指标测定、Iwao’s M·、x线性回归和Taylor’s幂的法则分析结果表明:豆田蒙古灰象甲的田间分布型呈聚集型,其基本成分是个体群,且聚集度随种群密度增减而升降。理论抽样数的计算结果表明:在每样方(1m^2)虫口密度(x)为2左右,允许误差(D)在0.3时,理论抽样数为13.6m^2。
The results obtained by measurement of the indices of aggregation intensty, analysis of Iwao's M·x- regression and of Taylor' spower rules indicated that the spatial distribution pattern of xylinophorus mongolicus Faust in soybean fields showed aggregation distribution and individual group. And it's aggregation degree increased (or decreased ) with increase (or decrease ) of population density.The results of calculating theoretical samples indicated that the average insects number was about 2 in a sampling plot ( one meter square) .When allowed error was 0.3, the theoretical sampling number was about 13.6 (one meter square) .
出处
《中国油料》
CSCD
北大核心
1990年第2期49-52,共4页
关键词
豆田
蒙古灰象甲
分布型
聚集度
Xylinophorus mongolicus Faust
Aggregation intensity
Distribution pattern
Theoretical sampling number
