气候变化领域集成服务门户(CCPortal): Impacts of Mineral Dust on Trace Element Concentrations (As, Cd, Cu, Ni and Pb) in Lichens and Soils at Lhuaan Man' (Yukon Territory, Canada)

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DOI	10.1029/2023JG007927
	Impacts of Mineral Dust on Trace Element Concentrations (As, Cd, Cu, Ni and Pb) in Lichens and Soils at Lhuaan Man' (Yukon Territory, Canada)
发表日期	2024
ISSN	2169-8953
EISSN	2169-8961
起始页码	129
结束页码	6
卷号	129 期号:6
英文摘要	Dust is a mineral aerosol of the atmosphere that often contains trace elements such as As, Cd, and Pb. Lh & ugrave;'& agrave;& agrave;n M & acirc;n' (Kluane Lake), located in southwestern Yukon, is a region of frequent dust activity. In 2016, the lake level fell due to a dramatic decrease in inflow from glacier meltwater, and the delta of the lake became an important source of dust to surrounding ecosystems. To determine the impacts of dust deposition on vegetation and soil trace element concentrations and characteristics, we sampled the lichen Peltigera canina and soil layers at 57 sites along a deposition gradient located 1.4-33.6 km downwind from the principal dust source. Arsenic, Cd, Cu, Ni and Pb in lichens were negatively correlated with the distance away from the dust source, with the highest correlations in Ni and Pb (r2 = 0.50 and 0.48, respectively). Lichen and tree abundances were negatively impacted by dust deposition, suggesting that dust can affect ecosystem vegetation composition. Starting 8 km away from the dust source, the concentrations of As, Ni, and Pb decreased by more than 50% per km, while Cd and Cu concentrations decreased by more than 40% per km. Overall, within the sampled ecosystems, soil pH is 1.4 times higher in the first 8 km from the dust source while carbon content and nutrients are lower, which implies changes in nutrient availability and cycling in dust-affected ecosystems. Plain Language Summary The delta of Lhuaan Man' (Kluane Lake), located in south west Yukon and on the traditional lands of Kluane First Nation, Champagne-Aishihik First Nation, and White River First Nation, is an are a where dust often settles and climate change has accelerated the melting of glaciers since the last iceage. Due to reduced glacier water flowing into the lake, the sediments in the delta are more exposed to wind, creating dust storms. To understand the impacts of dust deposition with in the surrounding ecosystems, we assessed the levels of trace metals in lichens and soils across a gradient from the delta to the lake. We found that distance from the dust source affected trace metal concentration sinlichens, surfacesoils, and vegetation. It is essential to understand how these metals spread as they can be potentially toxic and harmful to ecosystems and humans.
英文关键词	dust; trace elements; subarctic ecosystems; vegetation; soil
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:001235216500001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/292258
作者单位	Universite de Montreal; Universite de Montreal
推荐引用方式 GB/T 7714	. Impacts of Mineral Dust on Trace Element Concentrations (As, Cd, Cu, Ni and Pb) in Lichens and Soils at Lhuaan Man' (Yukon Territory, Canada)[J],2024,129(6).
APA	(2024).Impacts of Mineral Dust on Trace Element Concentrations (As, Cd, Cu, Ni and Pb) in Lichens and Soils at Lhuaan Man' (Yukon Territory, Canada).JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,129(6).
MLA	"Impacts of Mineral Dust on Trace Element Concentrations (As, Cd, Cu, Ni and Pb) in Lichens and Soils at Lhuaan Man' (Yukon Territory, Canada)".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 129.6(2024).

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