Isotopic biogeochemical indicators of evapotranspiration and nitrogen flows in a check‐dam catchment in the Loess Plateau, China

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	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
刊名	LAND DEGRADATION & DEVELOPMENT
	2018-10-01
卷号	29 期号:10 页码:3305-3316
关键词	check-dam catchment dual isotopes Loess Plateau N flow nitrate source
ISSN号	1085-3278
文献子类	Article
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%.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/40754]
专题	生态环境研究中心_城市与区域生态国家重点实验室
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]. 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.