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C:N:P stoichiometry in soil: is there a “Redfield ratio” for the microbial biomass?[J] . Cory C. Cleveland,Daniel Liptzin.Biogeochemistry . 2007 (3)
[10]
The distribution of soil nutrients with depth: Global patterns and the imprint of plants[J] . Esteban G. Jobbágy,Robert B. Jackson.Biogeochemistry . 2001 (1)