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Isotopic biogeochemical indicators of evapotranspiration and nitrogen flows in a check-dam catchment in the Loess Plateau, China
Chen, Shibo1,3; Huang, Yong3; Wang, Linhua3; Chen, Weiliang2,3; Wang, Yafeng1; Gao, Yang2,4
2018-10-01
Source PublicationLAND DEGRADATION & DEVELOPMENT
ISSN1085-3278
Volume29Issue:10Pages:3305-3316
Corresponding AuthorWang, Yafeng(yfwang@rcees.ac.cn) ; Gao, Yang(gaoyang@igsnrr.ac.cn)
AbstractThe increasingly fragile environment and associative nitrogen (N) biogeochemical cycle have become critical environmental and ecological issues in China's Loess Plateau. However, N flow and N source for typical catchments remain poorly understood in the Loess Plateau. In this study, we measured concentrations and isotopic signatures of N, hydrogen (H), and oxygen (O) in both rainfall and river water. Results showed that baseflow variation in total nitrogen (TN) concentrations ranged from 0.16 to 32.70mgL(-1). The monthly TN deposition flux and monthly TN wet deposition concentration to river water were shown significant variations between rainy and dry seasons. The range of variation in H-2 values for rainfall and baseflow was from -90.0 parts per thousand to 19.8 parts per thousand and from -67.2 parts per thousand to -38.4 parts per thousand, respectively, whereas O-18-H2O values ranged from -12.1 parts per thousand to +2.7 parts per thousand and from -9.3 parts per thousand to -3.6 parts per thousand, respectively. The Local Meteoric Water Line in the check-dam catchment was H-2=7.35 O-18+2.29 (R-2=0.93). Furthermore, NO3- N-15 and O-18 values in baseflow ranged from -2.0 parts per thousand to +20.5 parts per thousand and from +8.0 parts per thousand to +15.6 parts per thousand, respectively. The results indicated that rainfall was affected by below-cloud secondary evaporation and caused strong isotopic kinetic fractionation to occur during the precipitation process. The NO3- in runoff was mainly derived from the nitrification of soil organic matter and manure or sewage, for which the proportion of manure or sewage was from 50.5% to 83%.
Keywordcheck-dam catchment dual isotopes Loess Plateau N flow nitrate source
DOI10.1002/ldr.3090
WOS KeywordSOIL-EROSION ; STABLE-ISOTOPES ; NITRATE SOURCES ; WATER ; DEPOSITION ; OXYGEN ; RIVER ; DENITRIFICATION ; GROUNDWATER ; DELTA-O-18
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41390464] ; National Natural Science Foundation of China[41671271] ; National Natural Science Foundation of China[41571130083] ; Youth Innovation Promotion Association, CAS ; National Key Research and Development Program[2016YFC0501602]
Funding OrganizationNational Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; National Key Research and Development Program
WOS Research AreaEnvironmental Sciences & Ecology ; Agriculture
WOS SubjectEnvironmental Sciences ; Soil Science
WOS IDWOS:000447651700006
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/52750
Collection中国科学院地理科学与资源研究所
Corresponding AuthorWang, Yafeng; Gao, Yang
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
3.Chinese Acad Sci, State Key Lab Urban & Reg Ecol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Chen, Shibo,Huang, Yong,Wang, Linhua,et al. Isotopic biogeochemical indicators of evapotranspiration and nitrogen flows in a check-dam catchment in the Loess Plateau, China[J]. LAND DEGRADATION & DEVELOPMENT,2018,29(10):3305-3316.
APA Chen, Shibo,Huang, Yong,Wang, Linhua,Chen, Weiliang,Wang, Yafeng,&Gao, Yang.(2018).Isotopic biogeochemical indicators of evapotranspiration and nitrogen flows in a check-dam catchment in the Loess Plateau, China.LAND DEGRADATION & DEVELOPMENT,29(10),3305-3316.
MLA Chen, Shibo,et al."Isotopic biogeochemical indicators of evapotranspiration and nitrogen flows in a check-dam catchment in the Loess Plateau, China".LAND DEGRADATION & DEVELOPMENT 29.10(2018):3305-3316.
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