Geostatistical Analysis of Soil Nematode Communities under Degraded and Meliorated Grasslands in the Horqin Sand Land

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外文摘要：Geostatistics was applied to assess the spatial distribution of soil nematodes communities under Degraded Grassland (DG) and Meliorated Grassland (MG) in the Horqin Sand Land, Northeast China. Two 140 X 140 m plots, one in DG and the other in MG, weredivided into grids with 20 m spacing that included totally 128 sampling points. Soil samples were collected from the depth of 0-20 cm in April 2006. The result showed that nematode richness (number of genera) and abundance were lower under DG than underMG. Acrobeles and Bitylenchus were dominant genera under both DG and MG. The numbers of total nematodes and trophic groups were spatial dependent. Gaussian and Exponential models were the best-fitted models for the studying variables. The spatial rangesfor total nematodes, bacterivores and omnivores-predators were shorter under MG than under DG. Maps obtained by kriging showed that the numbers of total nematodes and trophic groups had different distribution patterns under DG and MG. Heterogeneity in the total nematodes and trophic groups was lower under DG than under MG.

外文关键词：

Degraded grasslandmeliorated grasslandsoil nematode communitygeostatistical analysisHorqin sand land

出版年：

2008

American-Eurasian Journal of Agricultural and Environmental Sciences

ISSN：1818-6769

年,卷(期)：2008.4(1)