干旱区生态环境知识资源中心(Arid): Hydrological processing of salinity and nitrate in the Salinas Valley agricultural watershed

Arid

DOI	10.1007/s10661-020-08811-3
	Hydrological processing of salinity and nitrate in the Salinas Valley agricultural watershed
	Zikalala, Prudentia; Kisekka, Isaya; Grismer, Mark
通讯作者	Zikalala, P (corresponding author), Univ Calif Davis, Dept Land Air & Water Resources, One Shield Ave, Davis, CA 95616 USA.
来源期刊	ENVIRONMENTAL MONITORING AND ASSESSMENT
ISSN	0167-6369
EISSN	1573-2959
出版年	2021
卷号	193 期号:SUPPL 1
英文摘要	Regime shifts of major salinity constituents (Ca, Mg, Na, K, SO4, Cl, HCO3, and NO3) in the lower Salinas River, an agricultural ecosystem, can have major impacts on ecosystem services central to continued agricultural production in the region. Regime shifts are large, persistent, and often abrupt changes in the structure and dynamics of social-ecological systems that occur when there is a reorganization of the dominant feedbacks in the system. Monitoring information on changes in the system state, controlling variables, and feedbacks is a crucial contributor to applying sustainability and ecosystem resilience at an operational level. To better understand the factors driving salinization of the lower Salinas River on the central coast of California, we examined a 27-year record of concentrations of major salinity constituents in the river. Although limited in providing an understanding of solute flux behavior during storm events, long-term grab sampling datasets with accompanying stream discharges can be used to estimate the actual history of concentrations and fluxes. We developed new concentration-discharge relationships to evaluate the dynamics of chemical weathering, hydrological processes, and agricultural practices in the watershed. Examinations of long-term records of surface water and groundwater salinity are required to provide both understanding and perspective towards managing salinity in arid and semi-arid regions while also enabling determination of the influence of external climatic variability and internal drivers in the system. We found that rock weathering is the main source of Ca, Mg, Na, HCO3, and SO4 in the river that further enables ion exchange between Ca, Mg, and Na. River concentrations of K, NO3, and Cl were associated with human activities while agricultural practices were the major source of K and NO3. A more direct anthropogenic positive trend in NO3 that has persisted since the mid-1990s is associated with the lag or memory effects of field cropping and use of flood irrigation. Event to inter-year scale patterns in the lower Salinas River salinity are further controlled by antecedent hydrologic conditions. This study underscores the importance of obtaining long-term monitoring records towards understanding watershed changes-of-state and time constants on the range of driving processes.
英文关键词	Salinity Nitrate Agricultural pollution Water quality Statistics Time-series analysis
类型	Article
语种	英语
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:000650632400001
WOS关键词	SOUTH-WEST ENGLAND ; SOCIO-HYDROLOGY ; SMALL CATCHMENT ; RIVER ; CHEMISTRY ; DISCHARGE ; PERIOD ; BASIN ; SUSTAINABILITY ; VARIABILITY
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	University of California, Davis
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350138
作者单位	[Zikalala, Prudentia] Univ Calif Davis, Dept Land Air & Water Resources, One Shield Ave, Davis, CA 95616 USA; [Kisekka, Isaya; Grismer, Mark] Univ Calif Davis, Dept Land Water Resources & Biol & Agr Engn, One Shield Ave, Davis, CA 95616 USA
推荐引用方式 GB/T 7714	Zikalala, Prudentia,Kisekka, Isaya,Grismer, Mark. Hydrological processing of salinity and nitrate in the Salinas Valley agricultural watershed[J]. University of California, Davis,2021,193(SUPPL 1).
APA	Zikalala, Prudentia,Kisekka, Isaya,&Grismer, Mark.(2021).Hydrological processing of salinity and nitrate in the Salinas Valley agricultural watershed.ENVIRONMENTAL MONITORING AND ASSESSMENT,193(SUPPL 1).
MLA	Zikalala, Prudentia,et al."Hydrological processing of salinity and nitrate in the Salinas Valley agricultural watershed".ENVIRONMENTAL MONITORING AND ASSESSMENT 193.SUPPL 1(2021).