Characteristics and source apportionment of nitrogen and phosphorus non-point source pollution in Wuming River Basin, Guangxi
LIU Yan-feng, CUI Guan-nan, BAI Xin-yu, YU Zhan-qiu, Dong Li-ming
State Key Laboratory of Environmental Protection and Food Chain Pollution Control, Key Laboratory of Cleaner Production and Resource Utilization of China Light Industry, School of Ecological Environment, Beijing Technology and Business University, Beijing 100048, China
Abstract：This paper analyzed the characteristics of soil nitrogen and phosphorus forms of different crops in the Wuming River Basin in Guangxi, and used principal component analysis to analyze the source of nitrogen and phosphorus in river water and sediments. The results of soil statistics and one-way analysis of variance for different crops showed that the total nitrogen (TN) and total phosphorus (TP) contents of the farmland around the watershed ranged from 802.60 to 2740.42mg/kg and 109.01 to 784.59mg/kg, respectively. The ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3--N) of corn planting soil were significantly higher than other soils (P<0.05); The NO3--N of sugarcane soil was significantly higher than other soils (P<0.05); Citrus planting soil Exchanged phosphorus (Ex-P) and iron/aluminum combined phosphorus (Fe/Al-P) were significantly higher than other soils (P<0.05). The results of principal component analysis indicated that TN in Wuming river may mainly originate from nutrient loss of soil planted with corn and sugarcane. Fe/Al-P, Ca-P and NH4+-N in the sediments may mainly originate from citrus, eucalyptus and corn soils, respectively. From the above analysis, it is known that the nitrogen loss of the soil for planting corn and sugarcane may have caused the most important non-point source pollution problem in Wuming River, indicating that the type of land crop is an important factor affecting non-point source pollution in the watershed.
刘岩峰, 崔冠楠, 白鑫宇, 于湛秋, 董黎明. 广西武鸣河流域非点源氮磷污染特征及源解析[J]. 中国环境科学, 2021, 41(6): 2821-2830.
LIU Yan-feng, CUI Guan-nan, BAI Xin-yu, YU Zhan-qiu, Dong Li-ming. Characteristics and source apportionment of nitrogen and phosphorus non-point source pollution in Wuming River Basin, Guangxi. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2821-2830.
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