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Effects of long-term fertilization on organic nitrogen fractions in aquic brown soil
REN Jin-feng, ZHOU Hua, MA Qiang, XU Yong-gang, JIANG Chun-ming, PAN Fei-fei, YU Wan-tai
Chinese Journal of Applied Ecology . 2017, (5): 1661 -1667 .  DOI: 10.13287/j.1001-9332.201705.006