Novel sediment source fingerprinting quantifying erosion-induced total nitrogen and total phosphorus outputs from an intensive agricultural catchment, North China

文献类型： 外文期刊

第一作者： Yu, Hanqing

作者： Yu, Hanqing;Oshunsanya, Suarau Odutola;Liu, Wenxiang;Zheng, Yu;Xue, Tingting;Adu-Gyam, Joseph;Heng, Lee;Oshunsanya, Suarau Odutola;Chappell, Adrian;Liu, Wenxiang

作者机构：

期刊名称：INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH （ 影响因子：6.4； 五年影响因子：7.5 ）

ISSN： 2095-6339

年卷期： 2023 年 11 卷 3 期

页码：

收录情况： SCI

摘要： Intensive farming is a primary cause of increased sediment and associated nitrogen (N) and phosphorus (P) loads in surface water systems. Determining their contributing sources, pathways and loads present major challenges in the high-intensity agricultural catchments. Herein, we quantify the sediment sources and magnitude of sediment total N and total P from different sources using a novel application of compound-specific stable isotope (CSSI) and fallout radionuclides (FRNs) of 137Cs and 210Pbex in an intensive agricultural catchment in North China. Sediment sources from surface and sub-surface soils were estimated from FRNs fingerprint and accounted for 62 & PLUSMN; 7% and 38 & PLUSMN; 7% respectively, while surface soil from land uses that originated from hillslope were identified by CSSI fingerprint. Using a novel application of FRNs and CSSI sediment fingerprinting techniques, the dominant sediment source was derived from maize farmland (44 & PLUSMN; 0.1%), followed by channel bank (38 & PLUSMN; 7%). The sedimentation rate (13.55 & PLUSMN; 0.30 t ha -1 yr �1) was quantified by the 137Cs cores (0-60 cm) at the outlet of this catchment. The total N and total P in sediment were both mostly derived from maize farmland and least from channel banks. The channel banks are significant sediment sources but contribute little to the input of sediment N and P for eutrophication. It implies that chemically-applied farmlands are the main hotspots for catchment erosion control and pollution prevention. The novel application of FRNs and CSSI techniques cost-effectively quantified sediment N and P loads from different sources with a single visit to the catchment, enabling rapid assessment for optimizing soil conservation strategies and land management practices. Keywords: Sediment sources, Land use, N and P loads, Compound-specific stable isotope, Fallout radionuclides.& COPY; 2022 International Research and Training Center on Erosion and Sedimentation, China Water and Power Press, and China Institute of Water Resources and Hydropower Research. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY -NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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