Distribution Characteristics and Source Analysis of Nitrogen and Phosphorus in Different Rivers in Two Water Period: A Case Study of Pi River and Shiting River in the Upper Reaches of Tuo River in China

Tongfei Li, Pingyan Zhou, Yunchang Ding, Qiding Tang, Shanshan Zhou and Ying Liu ()
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Tongfei Li: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Pingyan Zhou: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Yunchang Ding: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Qiding Tang: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Shanshan Zhou: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Ying Liu: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China

IJERPH, 2022, vol. 19, issue 19, 1-22

Abstract: In this paper, the distribution characteristics of total nitrogen (TN), total phosphorus (TP) and fractions of nitrogen and phosphorus in water and surface sediments of the Pi and Shiting rivers in the dry and wet seasons were studied by molybdenum blue/ascorbic acid spectrophotometry and Standard Measurements and Testing (SMT). Correlation analysis, cluster analysis and principal component analysis were used to identified nitrogen and phosphorus pollution sources. The results showed that: (1) nitrogen and phosphorus in water and surface sediments in the study area were at different levels. (2) In the Pi river, the decomposition of animal and plant residues, the leachate from the accumulation of aquaculture wastewater and urban domestic sewage were the main sources of nitrogen and phosphorus pollution, while in the Shiting river, the unreasonable application of pesticides and fertilizers, the degradation of animal and plant residues, agricultural wastewater from agricultural drainage channels, industrial production wastewater and the weathering of agricultural wastes had a great impact on the nitrogen and phosphorus pollution. The results in this study provide reliable experimental data and a reference to local relevant departments for the implementation of effective control measures for the reduction of the nitrogen and phosphorus pollution load in the river basin.

Keywords: nitrogen and phosphorus fractions; distribution characteristics; source analysis; Pi river; Shiting river; land use type (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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