Arid
DOI10.1016/j.jaridenv.2010.12.018
Evidence for a geochemical origin of the mysterious circles in the Pro-Namib desert
Naude, Y.1; van Rooyen, M. W.2; Rohwer, E. R.1
通讯作者Naude, Y.
来源期刊JOURNAL OF ARID ENVIRONMENTS
ISSN0140-1963
出版年2011
卷号75期号:5页码:446-456
英文摘要

The origin of the so-called "fairy circles" has not yet been established. Carbon monoxide (as an indicator of a natural gas microseep) was monitored inside and outside of the selected fairy circles in the Namib, Namibia, Southern Africa. Hydrocarbons were extracted from the soil by a novel method for trapping analytes onto silicone rubber designed for thermal desorption into a gas chromatograph mass spectrometer (GC MS). Unresolved complex mixtures with resolvable alkanes were detected in soil collected from two newly formed circles. Alkenes, the microbial degradation product of alkanes (microbial food source), were more abundant in the circles compared to the levels of alkenes detected in the matrix between circles. Results show a microseepage of gases and hydrocarbons which is expressed at the surface as a geobotanical anomaly of barren circles and circles of altered vegetation. In addition, this finding may suggest a new approach to the origin of the mima mounds (heuweltjies) of the Western Cape in South Africa. (C) 2010 Elsevier Ltd. All rights reserved.


英文关键词Fairy circle Hydrocarbon microseepage Mima mound (heuweltjies) Polydimethylsiloxane sorptive extraction Termites Vegetation stress
类型Article
语种英语
国家South Africa
收录类别SCI-E
WOS记录号WOS:000288642300008
WOS关键词SOUTH-AFRICA ; BASIN ; SEEPAGE ; SOILS ; CAPE ; HYDROCARBONS ; PATCHES ; MOUNDS ; REGION
WOS类目Ecology ; 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/2XILL650/168872
作者单位1.Univ Pretoria, Dept Chem, ZA-0002 Pretoria, South Africa;
2.Univ Pretoria, Dept Bot, ZA-0002 Pretoria, South Africa
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GB/T 7714
Naude, Y.,van Rooyen, M. W.,Rohwer, E. R.. Evidence for a geochemical origin of the mysterious circles in the Pro-Namib desert[J],2011,75(5):446-456.
APA Naude, Y.,van Rooyen, M. W.,&Rohwer, E. R..(2011).Evidence for a geochemical origin of the mysterious circles in the Pro-Namib desert.JOURNAL OF ARID ENVIRONMENTS,75(5),446-456.
MLA Naude, Y.,et al."Evidence for a geochemical origin of the mysterious circles in the Pro-Namib desert".JOURNAL OF ARID ENVIRONMENTS 75.5(2011):446-456.
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