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^1，2；李凤民²；贾宇²；王亚军²

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

WANG Jun^1,2，LI Fengmin²,JIA Yu²,WANG Yajun²

应用生态学报 . 2005, (03): 439 -444 .