Identification of river nitrogen trends and key factors in the Haihe River
1.Key Laboratory of Ecological Environment of Farmland in Hebei, State Key Laboratory of North China Crop Improvement and Regulation, College of Resources and Environmental Sciences, Hebei Agricultural University, Baoding 071000, China
2.School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
3.State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
4.Institute of Circular Economy, Beijing University of Technology, Beijing 100124, China
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