Studies On Spatiotemporal Dynamics Of Rhizosphere Parasitic Nematode Population Of Poplar Tree

Species and populations of plant-parasitic nematodes of the poplar tree in Jiangsu province were investigated during 2007~2008. 14 species of plant nematodes in rhizosphere of the poplar tree were identified. They belong to 4 orders, 10 families and 12 genus.These species are: Filenchus australis Xie & Feng,1996 Filenchus orbus Andrassy, 1954 Helicotylenchus digitiformis Ivanova,1967 Paratylenchus minutus Linford,1949 Scutellonema brachyurus Striner,1938 Aphelenchus isomerus Anderson & Hoopper, 1980 Aphelenchoides limberi Steiner,1936 Aphelenchoides bicaudatus Filipjuv&Schuurmans, Stekhoven,1941 Xiphinema americanum Cobb,1913 Tylenchorhynchus sp. Cobb,1913 Ditylenchus sp. Filipjev,1936 Pratylenchus sp. Filipjev,1936 Bursaphelenchus sp. Fuchs,1937 Paratrichodorus sp. Siddiqi,1974The studies on nematode population dynamics showed some results. Vertical distribution of plant-parasitic nematode species at soil depths of 5~15 cm,16~25 cm,26~35 cm,36~45 cm,46~55 cm was examined in two fields in Jiangsu province during 2007 to 2008. And the population density of plant-parasitic nematodes at different time of 3th, 6th, 8th, 10th, 12th month,2007 and 3th month,2008 were examined in two fields in Jiangsu province.Analysis on vertical distribution of nematodes showed that different species had different trends of the vertical distribution in soil. Filenchus australis was mainly distributed in the layer of 26~35cm; Helicotylenchus digitiformis was mainly distributed in the layer of 5~15cm; Scutellonema brachyurus was mainly distributed in the layer of 5~15cm; Paratylenchus minutus was mainly distributed in the layer of 36~45cm; Xiphinema americanum was mainly distributed in the layer of 16~25cm. And each nematode specie appears distinct and different seasonal dynamics. The population density of plant-parasitic nematodes is larger in spring and summer than in autumn and winter.