Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
![]() |
ISSN | 0140-1963 |
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 |
推荐引用方式 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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。