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| Species of Nematode in Onion Rhizosphere Soil and Their Population Density
Dynamic Variation Rule in Jiayuguan City |
| QI Yong-hong1，QIN Yi-tong2，MENG Li3，CAO Su-fang1，YANG Fa-rong1，LI Min-quan1* |
1Institute of Plant Protection， Gansu Academy of Agricultural Sciences， Lanzhou 730070， Gansu， China； 2Qingyang
Academy of Agricultural Sciences， Qingyang 745000， Gansu， China；3Grassland College， Gansu Agricultural
University， Lanzhou 730070， Gansu， China |
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Abstract Species of nematodes in onion（Allium cepae）rhizosphere and its population density
dynamics were studied in Jiayuguan city of Gansu Province．The results showed that 2 catalogues，4
families and 5 genera of plant-parasitic nematodes and 3 catalogues，5 families and 12 genera of nonplant
parasitic nematodes were seperated．The number of various kinds of nematodes was the least
at onion pre-transplant time，while its number at onion enlargement period reached the peak．The
dominant species of plant-parasitic nematodes in this region was Aphelenchus avenae，while the nonplant
nematode was Mesorhabditis spp．During various onion growing period，the population density
of non-plant-parasitic nematodes in onion rhizosphere in Jiayuguan city was higher than that of plantparasitic
ones．Wasilewska index value was 8.09，indicating the health index of onion planted soil in
Jiayuguan city was higher，and the soil health condition was fine.
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Received: 15 May 2013
Published: 07 July 2013
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