Drought reduces nitrogen supply and N<sub>2</sub>O emission in coastal bays

doi:10.1016/j.watres.2024.122362

	Drought reduces nitrogen supply and N₂O emission in coastal bays
	Zhang, Mingzhen 1,2; Yu, Dan 2; Yu, Yiqi 1,2; Yan, Ruifeng 2; Li, Yasong 3; Gong, Weijie 4; Xiao, Kai5 ; Li, Shaobin 2; Chen, Nengwang 1,2
发表期刊	WATER RESEARCH
ISSN	0043-1354
	2024-11-15
卷号	266 页码:13
关键词	Nitrogen cycling Climate change Greenhouse gas Coastal bays Groundwater discharge
DOI	10.1016/j.watres.2024.122362
通讯作者	Chen, Nengwang([email protected])
英文摘要	Severe droughts are increasingly prevalent under global climate change, disrupting watershed hydrology and coastal nitrogen cycling. However, the specific effects of drought on nitrogen transport from land to sea and subsequent nitrogen dynamics remain inadequately understood. In this study, we evaluated the consequences of the 2020-2022 drought on nitrogen supply and N2O emissions in Xiamen Bay, Southeast China. The results showed that drought significantly reduced annual NH4N, NO2N, and NO3N concentrations in Xiamen Bay by 49.4 %, 32.1 %, and 40.3 %, respectively, compared with the pre-drought year of 2019. The decline in NH4N concentration was mainly attributed to reduced surface runoff across all seasons. NO3N and NO2N concentrations declined only during spring and summer, primarily due to increased potential evapotranspiration (PET) hindering nitrogen supply via groundwater and concurrently enhancing land denitrification. Annual N2O emission from Xiamen Bay decreased by 40.0 similar to 72.7 % during the drought, highly correlated with the decline in the concentrations of NO3N, DIN, and DTN (p < 0.001). Comparative analysis revealed that NO3N concentration exhibited consistent negative linear regressions with PET and declined as evaporative demand drought conditions worsened across Xiamen Bay, Sansha Bay, and Chesapeake Bay throughout 2010-2022. NH4N concentration showed a positive regression with river discharge in Xiamen Bay, but negative regressions in the other two bays. Our results indicates that drought reduces N2O emission primarily driven by nitrate substrate reduction in the bay. This study provides new insights for predicting coastal nitrogen dynamics and greenhouse gas emissions under global environmental change.
资助机构	Science and Technology Program of Xiamen, China ; Science and Technology Program of Fujian Province, China ; National Natural Science Foundation of China ; PhD Fellowship of the State Key Laboratory of Marine Environmental Science at Xiamen University
收录类别	SCI
语种	英语
关键词[WOS]	SUBMARINE GROUNDWATER DISCHARGE ; RIVER ESTUARY ; CLIMATE ; DENITRIFICATION ; NITRATE ; NITRIFICATION ; EVOLUTION ; COMMUNITY ; TRANSPORT ; AMMONIUM
研究领域[WOS]	Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS记录号	WOS:001316980600001
引用统计
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/35611
专题	中国科学院海岸带环境过程与生态修复重点实验室
通讯作者	Chen, Nengwang
作者单位	1.Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China 2.Xiamen Univ, Coll Environm & Ecol, Fujian Prov Key Lab Coastal Ecol & Environm Studie, Xiamen, Peoples R China 3.Chinese Acad Geol Sci, Inst Hydrogeol & Environm Geol, Shijiazhuang 050061, Peoples R China 4.Hainan Trop Ocean Univ, Coll Marine Sci & Technol, Sanya 572022, Peoples R China 5.Chinese Acad Sci, Yantai Inst Coastal Zone Res, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Mingzhen,Yu, Dan,Yu, Yiqi,et al. Drought reduces nitrogen supply and N₂O emission in coastal bays[J]. WATER RESEARCH,2024,266:13.
APA	Zhang, Mingzhen.,Yu, Dan.,Yu, Yiqi.,Yan, Ruifeng.,Li, Yasong.,...&Chen, Nengwang.(2024).Drought reduces nitrogen supply and N₂O emission in coastal bays.WATER RESEARCH,266,13.
MLA	Zhang, Mingzhen,et al."Drought reduces nitrogen supply and N₂O emission in coastal bays".WATER RESEARCH 266(2024):13.