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[1]ZHOU Xiaowen,AN Yanling,WU Qixin,et al.Response of Spatial Distribution of Nitrogen and Phosphorus to Human Activities in Mountainous Rivers[J].Research of Soil and Water Conservation,2021,28(04):179-185.

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Response of Spatial Distribution of Nitrogen and Phosphorus to Human Activities in Mountainous Rivers

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 04 Page number: 179-185 Column: Public date: 2021-08-10

Title:: Response of Spatial Distribution of Nitrogen and Phosphorus to Human Activities in Mountainous Rivers

Author(s):: ZHOU Xiaowen¹, AN Yanling², WU Qixin¹, LÜ Jiemei², GAO Shilin¹, LI Fanxi¹; (1.Key Laboratory of Karst Environment and Geohazard Prevention, Guizhou University, Guiyang 550025, China; 2.Guizhou Institute of Technology, Guiyang 550002, China)

Keywords:: mountain river; nitrogen and phosphorus; spatial distribution; human activities

CLC:: X522

DOI:: -

Abstract:: In order to understand the distribution of nitrogen and phosphorus in mountainous rivers under the influence of human activities, the Tongzi River, the first tributary of Chishui River, was taken as the object to carry out field investigation, and water samples of its main stream and various tributaries were collected and analyzed. The results show that the average concentrations of total nitrogen, total phosphorus are 2.85 mg/L and 0.13 mg/L, respectively; the spatial difference of nitrogen and phosphorus concentrations is obvious; total nitrogen fluctuates from upstream to downstream, while total phosphorus is higher in the upstream than in the downstream; total nitrogen has a significant cumulative effect, from 1.34 mg/L in the upstream source river to 3.40 mg/L in the downstream estuary, and its spatial change is mainly affected by the point source input of the upstream urban sewage, the agricultural non-point source pollution in the middle and lower reaches and the water conservancy project; the input of total phosphorus from external sources of pollution in the upper reaches of the town kept the main stream concentration of Tongzi County at 0.16 mg/L, and it decreased to 0.09 mg/L at the downstream estuary, indicating the dual role of human pollution input and water self-purification ability in Tongzi River. The overall ratio of nitrogen to phosphorus in the Tongzi River is restricted by phosphorus, but it is shown that the upstream urban section of the river is in a potentially eutrophic area, and the water quality may be threatened by nitrogen and phosphorus pollution.

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Last Update: 2021-08-20