干旱区生态环境知识资源中心(Arid): Role of Aeolian Dust in Shaping Landscapes and Soils of Arid and Semi-Arid South Africa

Arid

DOI	10.3390/geosciences8050171
	Role of Aeolian Dust in Shaping Landscapes and Soils of Arid and Semi-Arid South Africa
	McAuliffe, Joseph R.; McFadden, Leslie D.; Hoffman, M. Timm
通讯作者	McAuliffe, JR
来源期刊	GEOSCIENCES
EISSN	2076-3263
出版年	2018
卷号	8 期号:5
英文摘要	The deposition of fine aeolian sediment profoundly influences the morphology of several different landscapes of the arid and semi-arid western portion of South Africa. Such landscapes and features include: (1) regularly-spaced mounds known as heuweltjies of the succulent Karoo region, (2) barren stone pavements in the more arid regions, and (3) hillslopes with smooth, curvilinear slope profiles that are mantled with coarse, stony colluvium. Investigations of each of these are presented, together with comparisons of similar features found within arid and semi-arid portions of Western North America. Recent findings suggest that the formation of the distinct, regularly-spaced heuweltjies involves a linked set of biological and physical processes. These include nutrient accumulation by termites and the production of dense vegetation patches, which, in turn, serve as a trap for aeolian sediments. Dust deposition is also responsible for the formation of stone pavements as demonstrated by research conducted principally in the Mojave Desert region of the United States. Mineralogical and geochronological studies have demonstrated that the stone clasts remain on the surface as fine aeolian sediments are translocated downward beneath the clasts resulting in a silt-rich soil horizon directly beneath the clasts. Pavements examined in South Africa have the same morphological features that can only be explained by the same process. The formation of soils on hillslopes mantled with stony colluvium are commonly viewed as having formed through the in-situ weathering of the stony colluvium. However, like pavements, mantles of coarse, stony colluvium are effective dust traps that provide the long-term stability required for advanced development of thick, fine-grained soils. This process contributes to the evolution of smooth, vegetated, curvilinear slope profiles. In each of these examples, the accumulation of dust has a profound influence, not only in soil formation, but also on the development of dominant landform characteristics. A greater awareness of these processes will contribute considerably to the growth of knowledge about soils and landscape development in the drylands of South Africa.
英文关键词	colluvium cumulic soil desert pavement heuweltjie hillslope Karoo loess Mima mound termite mound vesicular horizon
类型	Review
语种	英语
开放获取类型	Other Gold
收录类别	ESCI
WOS记录号	WOS:000435194000026
WOS关键词	CIMA-VOLCANIC-FIELD ; MIMA-LIKE MOUNDS ; HEUWELTJIE EARTH MOUNDS ; WESTERN CAPE PROVINCE ; MOJAVE-DESERT ; SUCCULENT KAROO ; QUARTZ-FIELDS ; HYDRAULIC-PROPERTIES ; VESICULAR HORIZONS ; VEGETATION CHANGE
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/332832
作者单位	[McAuliffe, Joseph R.] Desert Bot Garden, Dept Res Conservat & Collect, Phoenix, AZ 85008 USA; [McFadden, Leslie D.] Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA; [Hoffman, M. Timm] Univ Cape Town, Dept Biol Sci, ZA-7701 Cape Town, South Africa
推荐引用方式 GB/T 7714	McAuliffe, Joseph R.,McFadden, Leslie D.,Hoffman, M. Timm. Role of Aeolian Dust in Shaping Landscapes and Soils of Arid and Semi-Arid South Africa[J],2018,8(5).
APA	McAuliffe, Joseph R.,McFadden, Leslie D.,&Hoffman, M. Timm.(2018).Role of Aeolian Dust in Shaping Landscapes and Soils of Arid and Semi-Arid South Africa.GEOSCIENCES,8(5).
MLA	McAuliffe, Joseph R.,et al."Role of Aeolian Dust in Shaping Landscapes and Soils of Arid and Semi-Arid South Africa".GEOSCIENCES 8.5(2018).