香蕉根际线虫垂直分布和种群趋势的研究

A STUDY ON THE VERTICAL DISTRIBUTION AND POPULATION TRENDS OF RHIZOSPHERE NEMATODES OF BANANA

摘要: 在华南农业大学香蕉园的根际线虫主要种群是肾形肾状线虫(R(?)Linford & oliveina,1940),占线虫总效的79.74％;小秆线虫(R(?) spp.),占13.45％和双宫螺旋线虫H(?)(?)(Cobb,1893)Sher,1961,占3.53％。不同种群线虫在土壤中的垂直分布有不同的趋向性,小秆线虫主要分布在0—10厘米处;双宫螺旋线虫在11—20厘米;肾形肾状线虫在31—50厘米。肾形肾状线虫有明显的季节性波动,5月上旬是全年发生的最高峰时期,2月下旬是全年发生效量最少时期,其波动与积温及土壤含水量有密切关系,小秆虫和双宫螺旋线虫的季节波动不明显。

Abstract: The most important nematodes on the Banana plantation of south China Agricultural University were reniform nematodes (Rotylenchulus reniformis),rhabditids (Rhabdictis spp.) and spiral nematodes (Helicotyleuchus dihystera).There were different trends on the vertical distribution of varide species of nematodes in the soil.Rhabdictid distributed mainly fron o-10cm and spiral nematodes from 11-20cm,but reniform nematodes from31-50cm.Reniform nematodes showed distinctly seasonal fluctuation.The highest population density of them occurred in early May and the lowest in laterFebruary.Population fluctuation was closely correlated with the accumulated temperature and soil moilture content.Rhabditids and spiral nematodes did not appear a distinct,seasonal fluctuations.