气候变化领域集成服务门户(CCPortal): Saltwater intrusion increases phosphorus abundance and alters availability in coastal soils with implications for future sea level rise

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DOI	10.1016/j.scitotenv.2024.172624
	Saltwater intrusion increases phosphorus abundance and alters availability in coastal soils with implications for future sea level rise
	Gu, Chunhao; Joshi, Sunendra; Fischel, Matthew H. H.; Tomaszewski, Elizabeth J.; Northrup, Paul; Sparks, Donald L.
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	931
卷号	931
英文摘要	Sea level rise (SLR) promotes saltwater intrusion (SWI) into coastal soils globally at an increasing rate, impacting phosphorus (P) dynamics and adjacent water quality. However, how SWI influences P molecular speciation and availability in coastal soils remains poorly understood. By using a space-for-time substitution strategy, we evaluated the SWI impacts on P transformation along a SWI gradient at the Rehoboth Inland Bay, which consists of five sampling locations along a transect representing different SWI degrees. Soils were analyzed at the macroand micro-scale using X-ray absorption near edge spectroscopy (XANES) and the modified Hedley fractionation. With increasing distance from the Bay, soil salinity (29.3 -0.07 mmhos cm -1 ), the proportion of Fe 3+ to total Fe, and P concentrations decreased. The fractionation showed that recalcitrant P was dominant (86.9 -89.5% of total P). With increasing SWI, labile P increased gradually, reached a plateau, and then decreased sharply. Bulk XANES spectroscopy showed that soil P was likely dominated by iron and aluminum-associated P (Fe/Al-P), regardless of the SWI degree. Hence, with increasing SWI, P increasingly accumulated in a recalcitrant pool, mainly as Fe/AlP. mu-XANES spectroscopy revealed that calcium-associated P (Ca -P) existed in P-rich spots of the greatest SWI soil while Al -P occurred in P-rich spots of the low SWI soil, consistent with the greater HCl-P (presumably Ca -P) in the former soil. Overall, results demonstrate that SWI impacts P availability and environmental risk in coastal soils depending on the degree of SWI. These findings have important implications for understanding soil P cycling and availability in SLR -impacted coastal areas.
英文关键词	Sea level rise; Saltwater intrusion; Climate change; Phosphorus; Coastal soils; Redox; Flooding
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001238702700002
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302522
作者单位	University of Delaware; United States Department of Agriculture (USDA); State University of New York (SUNY) System; State University of New York (SUNY) Stony Brook; United States Department of the Interior; United States Geological Survey
推荐引用方式 GB/T 7714	Gu, Chunhao,Joshi, Sunendra,Fischel, Matthew H. H.,et al. Saltwater intrusion increases phosphorus abundance and alters availability in coastal soils with implications for future sea level rise[J],2024,931.
APA	Gu, Chunhao,Joshi, Sunendra,Fischel, Matthew H. H.,Tomaszewski, Elizabeth J.,Northrup, Paul,&Sparks, Donald L..(2024).Saltwater intrusion increases phosphorus abundance and alters availability in coastal soils with implications for future sea level rise.SCIENCE OF THE TOTAL ENVIRONMENT,931.
MLA	Gu, Chunhao,et al."Saltwater intrusion increases phosphorus abundance and alters availability in coastal soils with implications for future sea level rise".SCIENCE OF THE TOTAL ENVIRONMENT 931(2024).