干旱区生态环境知识资源中心(Arid): The enigmatic enrichment of potassium and magnesium in runoff and floodwater in the Negev: Do biocrusts hold the key?

Arid

DOI	10.1016/j.scitotenv.2023.168753
	The enigmatic enrichment of potassium and magnesium in runoff and floodwater in the Negev: Do biocrusts hold the key?
	Kidron, Giora J.; Starinsky, Abraham; Xiao, Bo
通讯作者	Kidron, GJ
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	911
英文摘要	Regardless of lithology and plant cover, chemical composition of floodwater in the Negev show a consistent enrichment in K+ and Mg2+ ions, which could not have been explained by the rock or clay minerals or (due to the scarcity of plants) by plant decomposition. Hypothesizing that rock-dwelling (lithobionts) or soil (loess)-dwelling biocrusts may shed light on the phenomena, we conducted sprinkling experiments in the Negev Highlands. Sprinkling was conducted on 4 types of lithobionts: cyanobacteria which inhabit the south-facing bedrock (ENC), epilithic lichens, inhabiting the inclined (EPIi) and the flat (EPIf) north-facing bedrocks, and endolithic lichens (ENL) inhabiting south-facing boulders. Additional sprinkling took place on two types of soil biocrusts, a mixed crust composed of cyanobacteria, lichens and mosses at the north-facing footslope and a cyanobacterial crust at the more xeric south-facing footslope. The runoff water (of 5 and for 4 plots for each lithobiont and soil biocrust type, respectively) was analyzed for the ionic composition of Na+, K+, Mg2+, Ca2+, NH4+, Cl, SO42, and NO3, whereas HCO3 was calculated. In comparison to rainwater, all habitats (except for K+ in ENL) showed high enrichment ratios (ERs) in K+ and Mg2+, which, unlike the high ERs of the other ions (such as SO42 that may stem from gypsum dissolution), could not have been explained by the rock lithology, clay or dust composition. It is suggested that following wetting, K+, serving for osmoregulation of cells, is released by the crust organisms, being thus responsible for K+ enrichment, while chlorophyll degradation is responsible for Mg2+ enrichment. It is suggested that rock-and soil-dwelling microorganisms may explain K+ and Mg2+ enrichment in runoff and floodwater and subsequently in groundwater of the Negev, and possibly in other arid zones worldwide, affecting in turn the quality of irrigation and drinking water.
英文关键词	Biological soil crusts cyanobacteria Dew Lichens Lithobionts
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001126671000001
WOS关键词	ARID LIMESTONE HILLSIDE ; BIOLOGICAL SOIL CRUSTS ; CHEMICAL-COMPOSITION ; NORTHERN NEGEV ; MICROBIOTIC CRUST ; TURGOR PRESSURE ; MOISTURE REGIME ; DRAINAGE-BASIN ; GROUND-WATER ; DESERT
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/2XILL650/405441
推荐引用方式 GB/T 7714	Kidron, Giora J.,Starinsky, Abraham,Xiao, Bo. The enigmatic enrichment of potassium and magnesium in runoff and floodwater in the Negev: Do biocrusts hold the key?[J],2024,911.
APA	Kidron, Giora J.,Starinsky, Abraham,&Xiao, Bo.(2024).The enigmatic enrichment of potassium and magnesium in runoff and floodwater in the Negev: Do biocrusts hold the key?.SCIENCE OF THE TOTAL ENVIRONMENT,911.
MLA	Kidron, Giora J.,et al."The enigmatic enrichment of potassium and magnesium in runoff and floodwater in the Negev: Do biocrusts hold the key?".SCIENCE OF THE TOTAL ENVIRONMENT 911(2024).