干旱区生态环境知识资源中心(Arid): Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient

Arid

DOI	10.1016/j.jenvman.2023.117462
	Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
	Arce, Maria Isabel; Sanchez-Garcia, Maria; Martinez-Lopez, Javier; Cayuela, Maria Luz; Sanchez-Monedero, Miguel Angel
通讯作者	Arce, MI
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2023
卷号	333
英文摘要	In the Mediterranean arid region such as Southeast (SE) Spain, a considerable part of the fluvial network runs permanently dry. Here, many dry watercourses are embedded in catchments where agriculture has brought changes in carbon (C) and nitrogen (N) availability due to native riparian vegetation removal and the establishment of intensive agriculture. Despite their increasing scientific recognition and vulnerability, our knowledge about dry riverbeds biogeochemistry and environmental drivers is still limited, moreover for developing proper management plans at the whole catchment scale. We examined CO2 and N2O emissions in five riverbeds in SE Spain of variable agricultural impact under dry and simulated rewetted conditions. Sediment denitrifying capacity upon rewetting was also assessed. We found that, regardless of agricultural impact, all riverbeds can emit CO2 under dry and wet conditions. Emissions of N2O were only observed in our study when a long-term rewetting driving saturated sediments was conducted. Besides, most biogeochemical capabilities were enhanced in summer, reflecting the sensitiveness of microbial activity to temperature. Biogeochemical processing variation across rivers appeared to be more controlled by availability of sediment organic C, rather than by agriculturally derived nitrate. We found that the studied dry riverbeds, agriculturally affected or not, may be active sources of CO2 and contribute to transitory N2O emissions during rewetting phenomena, potentially through denitrification. We propose that management plans aiming to support ecosystem biogeochemistry through organic C from native vegetation rather than agricultural exudates would help to reduce anthropogenic greenhouse gases emissions and excess of nutrients in the watershed and to control the nitrate inputs to coastal ecosystems.
英文关键词	Greenhouse gas emissions Nitrate Denitrification Drying-rewetting Dry riverbeds Campo de Cartagena
类型	Article
语种	英语
开放获取类型	hybrid, Green Published
收录类别	SCI-E
WOS记录号	WOS:001005000400001
WOS关键词	SOIL MICROBIAL COMMUNITIES ; DIOXIDE EMISSIONS ; OXIDE EMISSION ; STREAM ; DENITRIFICATION ; DYNAMICS ; DESERT ; FLUXES ; PULSES ; SPOT
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397280
推荐引用方式 GB/T 7714	Arce, Maria Isabel,Sanchez-Garcia, Maria,Martinez-Lopez, Javier,et al. Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient[J],2023,333.
APA	Arce, Maria Isabel,Sanchez-Garcia, Maria,Martinez-Lopez, Javier,Cayuela, Maria Luz,&Sanchez-Monedero, Miguel Angel.(2023).Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient.JOURNAL OF ENVIRONMENTAL MANAGEMENT,333.
MLA	Arce, Maria Isabel,et al."Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient".JOURNAL OF ENVIRONMENTAL MANAGEMENT 333(2023).