Hydrochemical characteristics and source identification of nitrate in surface water and shallow groundwater in the Poyang Lake Basin, China

被引：0

作者：

Yihui Dong ^{[1
]}

Shiyi Zhu ^{[2
]}

Jiale Li ^{[1
]}

Wenwen Liu ^{[1
]}

Zebing Li ^{[3
]}

Zhanxue Sun ^{[1
]}

Chunhuang Liu ^{[1
]}

机构：

[1] East China University of Technology,School of Water Resources and Environmental Engineering

[2] Ministry of Natural Resources,Key Laboratory of Groundwater Sciences and Engineering

[3] University of Geosciences,Key Laboratory of Groundwater Quality and Health ChinaMinistry of Education

[4] China National Nuclear Corporation,Research Institute No. 270

来源：

Environmental Earth Sciences | 2025年 / 84卷 / 10期

关键词：

Poyang Lake basin; Hydrochemical characteristics; Groundwater; Nitrogen and oxygen stable isotopes; Bayesian model;

D O I：

10.1007/s12665-025-12277-2

中图分类号：

学科分类号：

摘要：

The hydrochemical characteristics and nitrate nitrogen–oxygen isotopes of lake water systems provide critical insights for identifying nitrate pollution sources and elucidating their formation mechanisms. This study investigated the Poyang Lake Basin using an integrated approach combining graphical analysis, statistical modeling, and Bayesian inference, based on 26 surface water and 31 groundwater samples collected in November 2019. The results revealed complex hydrochemical diversity in the study area, with HCO3-Ca type water dominating both surface water (92.3%) and shallow groundwater (83.9%). While surface water originated primarily from atmospheric precipitation, shallow groundwater showed additional influences from water–rock interactions and cation exchange. Carbonate rocks, evaporites, and silicates constituted the primary anion sources for groundwater. Surface water nitrate exhibited strong positive correlations (r = 0.54–0.93) with TDS, HCO3−, Cl−, SO42−, and major cations (K+, Ca2+, Na+, Mg2+). In contrast, groundwater nitrate demonstrated weaker correlations (r = 0.31–0.63) with these parameters, suggesting more intricate formation processes. Neither nitrification nor denitrification significantly influenced basin water chemistry. Source apportionment analysis identified soil nitrogen (45.2%) as the dominant nitrate contributor in surface water, followed by atmospheric deposition (28.1%), agricultural fertilizers (19.7%), and domestic waste (7.0%). These findings establish a theoretical foundation for ecological management and nitrate pollution control through comprehensive hydrochemical characterization and pollution source identification.

引用