气候变化领域集成服务门户(CCPortal): Isotopic biogeochemical indicators of evapotranspiration and nitrogen flows in a check-dam catchment in the Loess Plateau, China

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DOI	10.1002/ldr.3090
	Isotopic biogeochemical indicators of evapotranspiration and nitrogen flows in a check-dam catchment in the Loess Plateau, China
	Chen, Shibo; Huang, Yong; Wang, Linhua; Chen, Weiliang; Wang, Yafeng; Gao, Yang
通讯作者	Wang, YF (通讯作者)
发表日期	2018
ISSN	1085-3278
EISSN	1099-145X
起始页码	3305
结束页码	3316
卷号	29 期号:10
英文摘要	The 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%.
关键词	SOIL-EROSION NITRATE SOURCES WATER DEPOSITION OXYGEN RIVER DENITRIFICATION GROUNDWATER DELTA-O-18 SYSTEM
英文关键词	check-dam catchment; dual isotopes; Loess Plateau; N flow; nitrate source
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
WOS类目	Environmental Sciences ; Soil Science
WOS记录号	WOS:000447651700006
来源期刊	LAND DEGRADATION & DEVELOPMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259190
推荐引用方式 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]. 中国科学院青藏高原研究所,2018,29(10).
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).
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).