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dc.contributor.authorYue, Fu-Junen_UK
dc.contributor.authorLi, Si-Liangen_UK
dc.contributor.authorWaldron, Susanen_UK
dc.contributor.authorWang, Zhong-Junen_UK
dc.contributor.authorOliver, David Men_UK
dc.contributor.authorChen, Xien_UK
dc.contributor.authorLiu, Cong-Qiangen_UK
dc.description.abstractUnderstanding where nitrate is mobilized from and under what conditions is required to reduce nitrate loss and protect water quality. Low frequency sampling may inadequately capture hydrological and biogeochemical processes that will influence nitrate behavior. We used high-frequency isotope sampling and in-situ nitrate sensing to explore nitrate export and transformation in a karst critical zone. Nitrate was mobilised during light rainfall, and transferred from soil layers to the karst matrix, where some nitrate was retained and denitrified. Nitrate isotopic composition changed rapidly during the rising limb of events and slowly during the falling limb. The main nitrate source was synthetic fertiliser (up to 80% during event flow), transported by conduit flow following high rainfall events, and this contribution increased significantly as discharge increased. Soil organic nitrogen contribution remained constant indicating at baseflow this is the primary source. Isotope source appointment of nitrate export revealed that synthetic fertilizer accounted for more than half of the total nitrate export, which is double that of the secondary source (soil organic nitrogen), providing valuable information to inform catchment management to reduce nitrate losses and fluvial loading. Careful land management and fertilizer use are necessary to avoid nitrate pollution in the karst agroecosystem, for example by timing fertilizer applications to allow for plant uptake of nitrate before rainfall can flush it from the soils into the karst and ultimately into catchment drainage.en_UK
dc.publisherElsevier BVen_UK
dc.relationYue F, Li S, Waldron S, Wang Z, Oliver DM, Chen X & Liu C (2020) Rainfall and conduit drainage combine to accelerate nitrate loss from a karst agroecosystem: insights from stable isotope tracing and high-frequency nitrate sensing. Water Research, 186, Art. No.: 116388.
dc.rightsThis is an open access article distributed under the terms of the Creative Commons CC-BY license (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. You are not required to obtain permission to reuse this article.en_UK
dc.subjectDual isotopeen_UK
dc.subjectRainfall eventsen_UK
dc.subjectKarst critical zoneen_UK
dc.titleRainfall and conduit drainage combine to accelerate nitrate loss from a karst agroecosystem: insights from stable isotope tracing and high-frequency nitrate sensingen_UK
dc.typeJournal Articleen_UK
dc.citation.jtitleWater Researchen_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.funderNERC Natural Environment Research Councilen_UK
dc.contributor.affiliationTianjin University, Chinaen_UK
dc.contributor.affiliationTianjin University, Chinaen_UK
dc.contributor.affiliationUniversity of Glasgowen_UK
dc.contributor.affiliationChinese Academy of Sciencesen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationTianjin University, Chinaen_UK
dc.contributor.affiliationTianjin University, Chinaen_UK
dc.relation.funderprojectThe transmissive critical zone: understanding the karst hydrology - biogeochemical interface for sustainable managementen_UK
dc.relation.funderrefNE/N007425/1 70709/1en_UK
Appears in Collections:Biological and Environmental Sciences Journal Articles

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