干旱区生态环境知识资源中心(Arid): Dust provenance and its role as a potential fertilizing agent for the Okavango Delta, Botswana

Arid

DOI	10.1002/esp.4840
	Dust provenance and its role as a potential fertilizing agent for the Okavango Delta, Botswana
	Humphries, Marc S.1; Benitez-Nelson, Claudia R.2; Bizimis, Michael 2; Ralph, Timothy J.3; Larkin, Zacchary T.3; McCarthy, Terence S.4
通讯作者	Humphries, Marc S.
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
出版年	2020
卷号	45 期号:8 页码:1705-1716
英文摘要	Dust plays a globally important role in supplying biologically essential elements to landscapes underlain by nutrient-poor substrates. Here we show that dust may play a significant role in sustaining productivity in the vast wetlands of the Okavango Delta in southern Africa, one of the world's richest biodiversity hotspots. Dust accumulates preferentially on tree-covered islands in the seasonal swamps of the Delta, creating pockets of fine-grained, nutrient-rich material within the semi-arid landscape of the Kalahari Desert. Strontium and neodymium isotopes reveal that this dust likely originates predominantly from the Makgadikgadi salt pans, located 300 km away, and contributes 10-80% of the fine-grained material present in Okavango island soils. Surface material sourced from the Makgadikgadi Pans contains relatively high amounts of bioavailable phosphorus and iron, potentially influencing Okavango Delta biological productivity. We propose that long-term ecosystem productivity and nutrient availability in the Okavango may be strongly mediated by regional dust inputs. Understanding the influence of dust deposition on nutrient loads and biogeochemical cycling is thus critical for predicting the response of the Okavango Delta to future changes in climate. We suggest that dust inputs may play a significant role in the supply of nutrients to other large, global wetland systems located in dryland environments. (c) 2020 John Wiley & Sons, Ltd
英文关键词	dust transport Kalahari Desert Makgadikgadi nutrient enrichment Okavango Delta radiogenic isotopes wetlands in drylands
类型	Article
语种	英语
国家	South Africa ; USA ; Australia
收录类别	SCI-E
WOS记录号	WOS:000519091700001
WOS关键词	PHOSPHORUS LIMITATION ; IRON SOLUBILITY ; AIRBORNE DUST ; ISLANDS ; IMPACT ; GROWTH ; FAN ; BIOGEOCHEMISTRY ; CONSERVATION ; INVENTORIES
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314321
作者单位	1.Univ Witwatersrand, Sch Chem, Johannesburg, South Africa; 2.Univ South Carolina, Sch Earth Ocean & Environm, Columbia, SC 29208 USA; 3.Macquarie Univ, Dept Environm Sci, Sydney, NSW, Australia; 4.Univ Witwatersrand, Sch Geosci, Johannesburg, South Africa
推荐引用方式 GB/T 7714	Humphries, Marc S.,Benitez-Nelson, Claudia R.,Bizimis, Michael,et al. Dust provenance and its role as a potential fertilizing agent for the Okavango Delta, Botswana[J],2020,45(8):1705-1716.
APA	Humphries, Marc S.,Benitez-Nelson, Claudia R.,Bizimis, Michael,Ralph, Timothy J.,Larkin, Zacchary T.,&McCarthy, Terence S..(2020).Dust provenance and its role as a potential fertilizing agent for the Okavango Delta, Botswana.EARTH SURFACE PROCESSES AND LANDFORMS,45(8),1705-1716.
MLA	Humphries, Marc S.,et al."Dust provenance and its role as a potential fertilizing agent for the Okavango Delta, Botswana".EARTH SURFACE PROCESSES AND LANDFORMS 45.8(2020):1705-1716.