Nitrate transformation and source tracking of Yarlung Tsangpo River using a multi-tracer approach combined with Bayesian stable isotope mixing model

被引：2

作者：

Bao, Yufei ^{[1
,2
]}

Sun, Meng ^{[1
,2
]}

Wang, Yuchun ^{[1
,2
]}

Hu, Mingming ^{[1
,2
]}

Hu, Peng ^{[1
]}

Wu, Leixiang ^{[1
,2
]}

Huang, Wei ^{[1
,2
]}

Li, Shanze ^{[1
,2
]}

Wen, Jie ^{[1
,2
]}

Wang, Zhongjun ^{[3
]}

Zhang, Qian ^{[4
]}

Wu, Nanping ^{[4
]}

机构：

[1] China Inst Water Resources & Hydropower Res, State Key Lab Watershed Water Cycle Simulat & Regu, Beijing 100038, Peoples R China

[2] China Inst Water Resources & Hydropower Res, Dept Water Ecol & Environm, Beijing 100038, Peoples R China

[3] Yancheng Inst Technol, Sch Environm Sci & Engn, Yancheng 224051, Peoples R China

[4] Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China

来源：

ENVIRONMENTAL RESEARCH | 2024年 / 252卷

基金：

中国国家自然科学基金;

关键词：

Nitrate transformation; Nitrate sources; Dual stable isotope; Bayesian model; The Yarlung Zangbon river; UNCERTAINTY ANALYSIS; ENHANCED NITROGEN; DENITRIFICATION; IDENTIFICATION; SEAWATER; BASIN;

D O I：

10.1016/j.envres.2024.118925

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Excessive levels of nitrate nitrogen (NO3--N) could lead to ecological issues, particularly in the Yarlung Tsangpo River (YTR) region located on the Qinghai Tibet Plateau. Therefore, it is crucial to understand the fate and sources of nitrogen to facilitate pollution mitigation efforts. Herein, multiple isotopes and source resolution models were applied to analyze key transformation processes and quantify the sources of NO3.(-) The delta N-15-NO3- and delta O-18-NO3- isotopic compositions in the YTR varied between 1.23 parts per thousand and 13.64 parts per thousand and 7.88 parts per thousand 11.19 parts per thousand, respectively. The NO3--N concentrations varied from 0.08 to 0.86 mg/L in the dry season and 0.20-1.19 mg/L during the wet season. Nitrification remained the primary process for nitrogen transformation in both seasons. However, the wet season had a widespread effect on increasing nitrate levels, while denitrification had a limited ability to reduce nitrate. The elevated nitrate concentrations during the flood season were caused by increased release of NO3- from manure & sewage (M&S) and chemical fertilizers (CF). Future endeavors should prioritize enhancing management strategies to improve the utilization efficiency of CF and hinder the direct entry of untreated sewage into the water system.

引用

页数：9