葡萄根际寄生线虫群落的生态学分析

对我国16省市葡萄根际的552个群落的生态分析表明,假壮螺旋线虫(Helicotylenchus pseudorobustus)的分布频率、密度、优势度、生物量和重要值5个生态指标显著高于其他线虫,是我国葡萄根际线虫的优势种群。不同树龄根际寄生线虫呈4种群落构成:单种型、多种单优型、多种双优型和多种均衡型。土壤速效钾、有机质含量、葡萄树种植年限、年平均气温和年平均降雨量是影响一些种类线虫群体数量的重要因子。不同的种在0～60cm 土层内的垂直分布不同,水平方向上离根30 cm 处的线虫数量显著高于100 cm 处的数量。假壮螺旋线虫在田间分布不均匀。

Ecological Analysis of Plant-parasitic Nematodes in Grape Rhizosphere

Nematode communities were extracted quantitatively from 552 soil samples collected around grape roots in 16 provinces,China.The analysis of frequence,density,prominence value,popula- tion biomass and importance values of various nematode species indicated that Helicotylenchus pseudorobustus was most prominent species in Chinese vineyard soils.The compositions of netmatode community were in four forms of structure identified as following respectively:monospecies pattern,monoprominent-polyspecies pattern,doub...