Responses of soil nitrogen in different soil organic matter fractions to long-term nitrogen addition in a semi-arid grassland
WU Yun-Tao, YANG Sen, WANG Xin, HUANG Jun-Sheng, WANG Bin, LIU Wei-Xing, LIU Ling-Li
Chin J Plant Ecol . 2021, (7): 790 -798 .  DOI: 10.17521/cjpe.2021.0044

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