黑龙江省大豆胞囊线虫种群分布和卵密度研究

Distribution of Soybean Cyst Nematode and Population Density in Heilongjiang Province

对采自黑龙江省35个市县112份大豆田土样,采用蔗糖梯度离心法,研究了大豆胞囊线虫种群分布和种群密度。结果表明：从黑龙江省采集的所有大豆根围土样都检测到了大豆胞囊线虫,各地胞囊线虫的种群密度不同,每100 g干土中的虫卵量差别大,100 g干土中,嫩江县的大豆胞囊线虫卵量多达30 583个,最少的是抚远县,100 g干土中只检测到56个虫卵。将黑龙江省各市县大豆胞囊线虫每100 g干土中的卵量分为3个区段：卵密度为0-2 000个·100 g^-1干土的占67.4%,卵密度为2 001-4 000个·100 g^-1干土的占13.9%,卵密度多于4 000个·100 g^-1干土的占18.7%。黑龙江省大豆主产区都检测到了大豆胞囊线虫的卵,西部地区卵种群密度高于东南部地区。根据研究结果,绘制出了黑龙江省大豆胞囊线虫卵密度分布图。

Dring 2007 and 2008,112 soybean cyst nematode（SCN） soil samples were collected from 35 cities and counties in Heilongjiang province of China.Sucrose gradient centrifugation was used to study the distribution of soybean cyst nematode and population density.SCN was detected in all the tested soil samples,suggested that SCN widely distributed in Heilongjiang province.The density of SCN varied with place,in Nenjiang county,the amount of soybean cyst lines up to 30 583 eggs,while only 56 eggs·100 g^-1 dry soil was detected in Fuyuan county.The population density of SCN eggs were divided into three sections： 0-2 000·100 g^-1 dry soil accounted for 67.4%,2 001-4 000·100 g^-1 dry soil accounted for 13.9%,more than 4 000 eggs·100 g^-1 dry soil accounted for 18.7%.The egg population density in western region was higher than that in southeast region.The distribution map of SCN eggs in Heilongjiang province were draw out according to the results.