Identification on the risk of nitrogen and phosphorus loss at small watershed based on nitrogen and phosphorus index
ZHANG Ping, GAO Yangxin, LIU Yunhui, DUAN Meichun, YU Zhenrong
Ecology and Environment . 2011, (7): 1018 -1025 .  DOI: 10.16258/j.cnki.1674-5906(2011)06-07-1018-08

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