Flow velocity and nutrients affect CO2 emissions from agricultural drainage channels in the North China Plain

doi:10.1186/s12302-020-00426-2

	Flow velocity and nutrients affect CO2 emissions from agricultural drainage channels in the North China Plain
	Leng, Peifang 1,2,3; Li, Fadong 1,2; Du, Kun 1,2; Li, Zhao 1,2; Gu, Congke 1,2; Koschorreck, Matthias 3
刊名	ENVIRONMENTAL SCIENCES EUROPE
	2020-10-31
卷号	32 期号:1 页码:13
关键词	CO2 emissions Agricultural irrigation drainage Controlled experiments Groundwater North China Plain
ISSN号	2190-4707
DOI	10.1186/s12302-020-00426-2
通讯作者	Li, Fadong(lifadong@igsnrr.ac.cn)
英文摘要	Background Groundwater is typically over-saturated in CO2 with respect to atmospheric equilibrium. Irrigation with groundwater is a common agricultural practice in many countries, but little is known about the fate of dissolved inorganic carbon (DIC) in irrigation groundwater and its contribution to the CO2 emission inventory from land to the atmosphere. We performed a mesocosm experiment to study the fate of DIC entering agricultural drainage channels in the North China Plain. Specifically, we aimed to unravel the effect of flow velocity and nutrient on CO2 emissions. Results All treatments were emitting CO2. Approximately half of the DIC in the water was consumed by TOC production (1-16%), emitted to the atmosphere (14-20%), or precipitated as calcite (CaCO3) (14-20%). We found that DIC depletion was stimulated by nutrient addition, whereas more CO2 evasion occurred in the treatments without nutrients addition. On the other hand, about 50% of CO2 was emitted within the first 50 h under high flow velocity. Thus, in the short term, high nutrient levels may counteract CO2 emissions from drainage channels, whereas the final fate of the produced biomass (burial versus mineralization to CO2 or even CH4) determines the duration of the effect. Conclusion Our study reveals that both hydrology and biological processes affect CO2 emissions from groundwater irrigation channels. The estimated CO2 emission from total groundwater depletion in the North China Plain is up to 0.52 +/- 0.07 Mt CO2 year(-1). Thus, CO2 emissions from groundwater irrigation should be considered in regional CO2 budgets, especially given that groundwater depletion is expected to acceleration in the future.
资助项目	National Natural Science Foundation of China (NSFC)[41771292] ; CAS-DAAD Joint Fellowship Program for Doctoral Students
WOS关键词	GREENHOUSE-GAS EMISSIONS ; GROUNDWATER DEPLETION ; CARBON EMISSIONS ; LAND-USE ; ECOSYSTEM METABOLISM ; WATER-RESOURCES ; AQUATIC CARBON ; RIVER NETWORK ; STREAMS ; SUSTAINABILITY
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000583184700001
资助机构	National Natural Science Foundation of China (NSFC) ; CAS-DAAD Joint Fellowship Program for Doctoral Students
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/156775]
专题	中国科学院地理科学与资源研究所
通讯作者	Li, Fadong
作者单位	1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 2.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog & Nat Resources Res, Beijing, Peoples R China 3.UFZ Helmholtz Ctr Environm Res, Dept Lake Res, Magdeburg, Germany
推荐引用方式 GB/T 7714	Leng, Peifang,Li, Fadong,Du, Kun,et al. Flow velocity and nutrients affect CO2 emissions from agricultural drainage channels in the North China Plain[J]. ENVIRONMENTAL SCIENCES EUROPE,2020,32(1):13.
APA	Leng, Peifang,Li, Fadong,Du, Kun,Li, Zhao,Gu, Congke,&Koschorreck, Matthias.(2020).Flow velocity and nutrients affect CO2 emissions from agricultural drainage channels in the North China Plain.ENVIRONMENTAL SCIENCES EUROPE,32(1),13.
MLA	Leng, Peifang,et al."Flow velocity and nutrients affect CO2 emissions from agricultural drainage channels in the North China Plain".ENVIRONMENTAL SCIENCES EUROPE 32.1(2020):13.