麦长管蚜及蚜茧蜂空间格局的地学统计学研究

Geostatiscal analysis on spatial patterns of Macrosiphum granarium and Aphidius.

应用地学统计学的原理和方法研究了不同时期麦长管蚜及蚜茧蜂种群的空间结构和空间相关性 .结果表明 ,不同时期麦长管蚜种群的半变异函数曲线皆为球型 ,其空间格局为聚集型 ,变程在 33～ 5 7cm之间 ;蚜茧蜂种群的拟合半变异函数曲线也表现为球型 ,呈聚集空间格局 ,空间变程在 36～ 5 5cm之间 ,并与麦长管蚜种群在数量和空间上有较强的追随关系 ,说明蚜茧蜂种群是麦长管蚜种群的优势种天敌 .

The spatial structure and spatial correlativity of both Macrosiphum granarium and Aphidius populations at different period were investigated with the method of geostatistics.The results showed that the semivariogram of M.granarium appeared as spherical type,indicating its spatial pattern was an aggregated type with a range from 33 to 57 cm.The semivariogram of Aphidius was fitted into spherical model too,indicating an aggregated spatial arrangement with a range of 36～55 cm.The amount and spatial distribution of Aphidius was closely related to that of M.granarium,suggesting that Aphidius is the dominant natural enemy influencing M.granarium population.