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三种集约化种植体系氮素平衡及其对地下水硝酸盐含量的影响
寇长林1,2;巨晓棠1;张福锁1
Nitrogen balance and its effects on nitrate-N concentration of groundwater in three intensive cropping systems of North China
KOU Changlin1,2,JU Xiaotang1,ZHANG Fusuo1
应用生态学报 . 2005, (04): 660 -667 .