Novel sediment source fingerprinting quantifying erosion-induced total nitrogen and total phosphorus outputs from an intensive agricultural catchment,North China
作者机构：Agricultural Clean Watershed Research GroupInstitute of Environment and Sustainable Development in AgricultureChinese Academy of Agricultural Sciences(CAAS)Haidian District100081BeijingChina International Atomic Energy AgencyViennaAustria Department of AgronomyUniversity of IbadanNigeria School of Earth and Environmental SciencesCardif UniversityCardifUK Chongqing Branch InstituteChangjiang River Scientific Research InstituteChongqing400026China
出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)
年 卷 期：2023年第11卷第3期
页 面：494-506页
核心收录：
学科分类：082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 0907[农学-林学] 08[工学] 0828[工学-农业工程] 09[农学] 0815[工学-水利工程]
基 金：supported by the International Atomic Energy Agency through coordination research projects(CRP)under Research Contract No.23008 and technical cooperation project(TCP)RAS 5084,and the Central Public-interest Scientific Institution Basal Research Fund(No.BSRF202004) Funding for AC to collaborate on this work was provided by the High-end Foreign Experts Recruitment Program from State of Administration of Foreign Experts Affairs of China This work was partly supported by the Science and Technology Major Project of Guangxi(Guike AA17204078)
主 题：Sediment sources Land use N and P loads Compound-specific stable isotope Falloutradionuclides
摘 要：Intensive farming is a primary cause of increased sediment and associated nitrogen(N)and phosphorus(P)loads in surface water *** their contributing sources,pathways and loads present major challenges in the high-intensity agricultural ***,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^(137)cs and^(210)pbex in an intensive agricultural catchment in North *** sources from surface and sub-surface soils were estimated from FRNs fingerprint and accounted for 62±7%and 38±7%respectively,while surface soil from land uses that originated from hillslope were identified by CssI *** a novel application of FRNs and CSSI sediment fingerprinting techniques,the dominant sediment source was derived from maize farmland(44±0.1%),followed by channel bank(38±7%).The sedimentation rate(13.55±0.30 t ha^(-1)yr^(-1))was quantifed by the^(137)cs cores(0-60 cm)at the outlet of this *** total N and total P in sediment were both mostly derived from maize farmland and least from channel *** channel banks are significant sediment sources but contribute little to the input of sediment N and P for *** implies that chemically-applied farmlands are the main hotspots for catchment erosion control and pollution *** 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.
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