半干旱黄土区苜蓿草地轮作农田土壤氮、磷和有机质变化

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王俊, 李凤民, 贾宇, 王亚军

Dynamics of soil nitrogen,phosphorus and organic matter in alfalfa-crop rotated farmland in semiarid area of Northwest China

WANG Jun, LI Fengmin, JIA Yu, WANG Yajun

应用生态学报 . 2005, (3): 439 -444 .