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Influence of broadleaf trees on soil chemical properties: A retrospective study in the Sub-Boreal Spruce Zone, British Columbia, Canada[J] . Paul Sanborn.Plant and Soil . 2001 (1)
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Soil organic matter, microbial biomass and enzyme activities in a tropical agroforestry system[J] . K. Chander,S. Goyal,D. P. Nandal,K. K. Kapoor.Biology and Fertility of Soils . 1998 (2)