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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, 巨晓棠, 张福锁
Nitrogen balance and its effects on nitrate-N concentration of groundwater in three intensive cropping systems of North China
KOU Changlin, JU Xiaotang, ZHANG Fusuo
应用生态学报 . 2005, (4): 660 -667 .