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Land use interacts with changes in catchment hydrology to generate chronic nitrate pollution in karst waters and strong seasonality in excess nitrate export
Fu-Jun Yue;  Susan Waldron;  Si-Liang Li ;  Zhong-Jun Wang;  Jie Zeng;  Sen Xu;  Zhi-Cai Zhang;  David M. Oliver
2019
Source PublicationScience of The Total Environment
Volume696Pages:1-8
Abstract

Agricultural land in karst systems can pollute water courses, with polluted waters travelling quickly to and through the sub-surface. Understanding how rapidly nitrate moves within the highly-transmissive karst critical zone (from soils to aquifers) is limited by low resolution data. To understand nitrate behavior and its controls, we deployed sensor technology at five sites to generate autonomously high-resolution time series of discharge and NO3–N, which is the major nitrogenous component, in a farmed karst catchment in Southwestern China. The [NO3–N] time series exhibited rapid response to rainfall-induced increases in discharge and a large magnitude in [NO3–N], from 0.72 to 16.3 mg/L across five sites. However, the magnitude of NO3–N response at each site was varied during rainfall events (wet season) and dry season. The highest mean [NO3–N] and normalized annual fluvial export occurred in a headwater catchment with a developed karst aquifer system. Seasonal variation in NO3–N export occurred in response to source availability, most notable in catchments with valley agriculture: in the wet season up to 94% of nitrate was exported from the headwater catchments within two months, but at the larger catchment scale, over the 6 month wet season, only 61% of total export occurred. At the larger catchment scale, [NO3–N] were lower due to buffering by the karstic aquifer network. From the time series we observe little decrease in [NO3–N] as discharge decreases in the dry season, indicating the karst aquifers are chronically-polluted with nitrate through slow flow pathways.

KeywordChronic Nitrate Pollution karst Critical zone Nitrate sensor Nitrate Export
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10508
Collection环境地球化学国家重点实验室
Affiliation1.School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom
2.Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
4.State Key Laboratory of Hydrology—Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
5.Biological & Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, United Kingdom
Recommended Citation
GB/T 7714
Fu-Jun Yue;Susan Waldron;Si-Liang Li ;Zhong-Jun Wang;Jie Zeng;Sen Xu;Zhi-Cai Zhang;David M. Oliver. Land use interacts with changes in catchment hydrology to generate chronic nitrate pollution in karst waters and strong seasonality in excess nitrate export[J]. Science of The Total Environment,2019,696:1-8.
APA Fu-Jun Yue;Susan Waldron;Si-Liang Li ;Zhong-Jun Wang;Jie Zeng;Sen Xu;Zhi-Cai Zhang;David M. Oliver.(2019).Land use interacts with changes in catchment hydrology to generate chronic nitrate pollution in karst waters and strong seasonality in excess nitrate export.Science of The Total Environment,696,1-8.
MLA Fu-Jun Yue;Susan Waldron;Si-Liang Li ;Zhong-Jun Wang;Jie Zeng;Sen Xu;Zhi-Cai Zhang;David M. Oliver."Land use interacts with changes in catchment hydrology to generate chronic nitrate pollution in karst waters and strong seasonality in excess nitrate export".Science of The Total Environment 696(2019):1-8.
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