Investigation Of Parasitic Nematodes Species And Distribution On Rhizosphere Of Alfalfa And Clover In Xinjiang

448 rhizosphere soil samples of alfalfa were collected from 9 places(region, autonomous prefecture and city) of Xinjiang in June, 2014 to October, 2015, and 40 rhizosphere soil samples of clover were collected from Urumqi.,The species of parasitic nematodes was identified by using the measurement data and morphological characteristics.According to the measurement data and morphological characteristics, Nine plant-parasitic nematodes from seven genera of five families were identified in the rhizosphere soil of alfalfa, which were Filenchus vulgaris(Brzeski,1963)Lowmsbery et Lownsbery,1983, Psilenchus hilarulus de Man,1921, Ditylenchus myceliophagus Goodey,1958, Aphelenchus avenae Bastian,1865, Aphelenchus eremitus Thoren,1961, Aphelenchus isomerus Anderson&Hooper, 1980(Ebsary,1991), Aphelenchus paramonovi Nesterov & Lisetskaya,1965, Aphelenchiodes limberi Steiner,1936 and Aphelenchiodes composticola Franklin,1957.Alfalfa root soil that through sprinkling irrigation, drip irrigation and flood irrigation were collected at different stages and different soil depths in April to October, 2015. Moreover, the plant nematodes of soil samples were counted. The impacts of soil depth, seasonal variation, soil moisture content and irrigation methods on the quantity dynamic changes of alfalfa rhizosphere parasitic nematodes were compared and analyzed. On the basis of three irrigation methods, the result showed that the quantity of plant nematodes was higher in the depth of 10-20 cm than other depths. With the depth increasing, the quantity of nematodes decreased accordingly. The density of nematodes was larger in June and August, and the density of nematodes was smaller in April and October. When the soil moisture content was around 11%-13%, the quantity of nematodes was the maximum, soil moisture content was too low or too high, and the quantity of nematodes was lower.Fourteen plant nematodes from ten genera of seven families were identified in the rhizosphere soil of clover, which were Filenchus vulgaris(Brzeski,1963)Lowmsbery et Lownsbery,1983, Rhabdotylenchus guangdongensis Xie, Feng, Li & Yin,1994, Psilenchus hilarulus de Man,1921, Ditylenchus tenuides Gritzenko,1971, Ditylenchus myceliophagus Goodey, 1958, Tylenchorhynchus brassicae, Siddiqi, 1961, Tylenchorhynchus claytoni Steiner,1937, Pratylenchus scribneri Steiner & Stanley,1943, Pratylenchus thornei Sher and Allen,1953, Scutellonema brachyurus(Steiner,1938) Andrassy,1958, Rotylenchus lobatus Filipjev,1936, Aphelenchus avenae Bastian,1865, Aphelenchiodes composticola Franklin,1957 and Aphelenchoides bicaudatus Filipjev & Schuurmans Stekhoven,1941.