干旱区生态环境知识资源中心(Arid): GEOMORPHOLOGICAL ASPECTS OF VEREDAS: AN ECOSYSTEM OF THE CERRADO BIOME, BRAZIL

Arid

	GEOMORPHOLOGICAL ASPECTS OF VEREDAS: AN ECOSYSTEM OF THE CERRADO BIOME, BRAZIL
	Augustin, Cristina H. R. R.; de Melo, Dirce Ribeiro; Antunes Aranha, Paulo Roberto
通讯作者	Augustin, CHRR
来源期刊	REVISTA BRASILEIRA DE GEOMORFOLOGIA
ISSN	1519-1540
EISSN	2236-5664
出版年	2009
卷号	10 期号:1 页码:103-114
英文摘要	Veredas are well-defined ecosystems that occur within the Brazilian biome of the Cerrado, and are characterized by the presence of Buritis-palm trees in semi-waterlogged conditions. Veredas can also be considered geomorphological features because they only occur along shallow kilometer-long valleys, with their slow flows contributing to the regional drainage systems of central and southeast areas of Brazil. Although being the object of several studies, the complexity of these geo-ecosystems is not yet fully understood. This study was carried out in a Vereda with an aim of providing a better understanding of the structure and dynamics between superficial and underground conditions, and their relation to the maintenance of water on the surface. The Vereda was located on an erosion surface with sandy soils formed over tertiary sandstones, in a semi arid area with annual mean rainfall of 1,045mm. Samples were collected along three transversal transects placed at the upper head, beginning of head incision, and at middle course. GPR radargrams were produced along each transect and three soil pits were opened, two at each valley side and one at the bottom floor. Radargrams show the presence of important fracture systems in the sandstones indicating that water retained in the Veredas is probably not part of the deep water table. Field observations and soil analysis show the presence of humidity inside the bottom floor soils associated with the presence of organic-clay, which seems to function as a sealing layer that retains water and allows it to stay on the surface during longer periods, similar to a perched water-table. Data also revealed rapid deposition of colluvium at the channel bottom, which is burying the superficial water flow and causing degradation of the ecosystem with the Buritis death.
英文关键词	Vereda radargrams water table
类型	Article
语种	葡萄牙语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000216928400010
WOS类目	Geography, Physical
WOS研究方向	Physical Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/329236
作者单位	[Augustin, Cristina H. R. R.; de Melo, Dirce Ribeiro; Antunes Aranha, Paulo Roberto] Univ Fed Minas Gerais, Inst Geociencias, Dept Geog, Av Antonio Carlos,6627 Campus Pampulha, BR-31270901 Belo Horizonte, MG, Brazil
推荐引用方式 GB/T 7714	Augustin, Cristina H. R. R.,de Melo, Dirce Ribeiro,Antunes Aranha, Paulo Roberto. GEOMORPHOLOGICAL ASPECTS OF VEREDAS: AN ECOSYSTEM OF THE CERRADO BIOME, BRAZIL[J],2009,10(1):103-114.
APA	Augustin, Cristina H. R. R.,de Melo, Dirce Ribeiro,&Antunes Aranha, Paulo Roberto.(2009).GEOMORPHOLOGICAL ASPECTS OF VEREDAS: AN ECOSYSTEM OF THE CERRADO BIOME, BRAZIL.REVISTA BRASILEIRA DE GEOMORFOLOGIA,10(1),103-114.
MLA	Augustin, Cristina H. R. R.,et al."GEOMORPHOLOGICAL ASPECTS OF VEREDAS: AN ECOSYSTEM OF THE CERRADO BIOME, BRAZIL".REVISTA BRASILEIRA DE GEOMORFOLOGIA 10.1(2009):103-114.