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Species effects on nitrogen cycling: a test with perennial grasses[J] . David A. Wedin,David Tilman.  Oecologia . 1990 (4)
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The spatial distribution of nematode trophic groups across a cultivated ecosystem. Robertson G P and Freckman D W. Ecology . 1995
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Plot scale spatial patterns of soil water content , pH, substrate-induced respiration and N mineralization in a temperate coniferous forest. Bruckner A,Kandeler E and Kampichler C. Geoderma . 1999