Response of soil nematode community structure and diversity to long-term land use in the black soil region in China

Ecological Research - Tập 27 - Trang 701-714 - 2012
Feng-Juan Pan1,2, Yan-Li Xu1, Neil B. McLaughlin2, Allen G. Xue2, Qing Yu2, Xiao-Zeng Han1, Wei Liu3, Li-Li Zhan1, Dan Zhao4, Chun-Jie Li1
1Key Laboratory of Mollisols Agroecology, National Observation Station of Hailun Agroecology System, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, China
2Eastern Cereal and Oilseed Research Centre, Research Branch, Agriculture and Agri-Food Canada, Ottawa, Canada
3Jiamusi Branch, Heilongjiang Academy of Agricultural Sciences, Jiamusi, China
4Horticultural Branch, Heilongjiang Academy of Agricultural Sciences, Harbin, China

Tóm tắt

Soil nematodes are sensitive to environmental changes and are used widely as indicators of soil conditions. The community structure and diversity of soil nematodes were studied in different long-term land use regimes in the black soil area in Northeast China. The land use regimes were maintained for 22 years, and included crop land (CL), grass land (GL) and bare land (BL). Soil samples were taken throughout the growing season, and nematodes were extracted and identified. A total of 39 nematode genera with relative abundance over 0.1 % were identified. Heterodera was the dominant genus in CL; Boleodorus was the dominant genus in GL, and Boleodorus, Eucephalobus and Filenchus were the dominant genera in BL. Land use had a significant effect on abundance of all soil nematode tropic groups and ecological indices. Sampling time had an effect on soil nematode abundance, but only on three of the eight nematode ecological indices MI (maturity index of free-living nematode), CI (channel index) and EI (enrichment index). SR (species richness index) was highest in GL where plant species diversity was also high. The CI was the highest in BL among three land uses, which means the soil food web dominated, with fungal decomposition channels in BL. Soil nematode community structure and diversity was shown to be an effective and informative tool for analyzing ecological aspects of land use in black soil regions. The data are inconclusive as to whether the effect of land use on soil nematode parameters is direct, or indirect via inducing changes in soil physicochemical properties.

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