干旱区生态环境知识资源中心(Arid): Late Quaternary geochronologic record of soil formation and erosion: Effects of climate change on Mojave Desert hillslopes (Nevada, USA)

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DOI	10.1130/G49270.1
	Late Quaternary geochronologic record of soil formation and erosion: Effects of climate change on Mojave Desert hillslopes (Nevada, USA)
	Persico, L. P.; McFadden, L. D.; McAuliffe, J. R.; Rittenour, T. M.; Stahlecker, T. E.; Dunn, S. B.; Brody, S. A. T.
通讯作者	Persico, LP (corresponding author), Whitman Coll, Dept Geol, Walla Walla, WA 99362 USA.
来源期刊	GEOLOGY
ISSN	0091-7613
EISSN	1943-2682
出版年	2022
卷号	50 期号:1 页码:54-59
英文摘要	Climate change is an often-cited control on geomorphic processes in the arid southwestern United States, but links to direct climatic factors and vegetation change remain under debate. Hillslopes at a site in the eastern Mojave Desert in southern Nevada are mantled by 0-1.5 m of colluvial deposits. Accumulation of weathered bedrock combined with eolian inputs of fine sand and silt led to the formation of well-developed soil profiles. Surface sediments from both sources were incorporated into colluvium, allowing both processes to be dated with optically stimulated luminescence (OSL). OSL ages indicate a period of increased colluviation in the Late Pleistocene facilitated by enhanced bedrock weathering and dust deposition. Hillslope aspect strongly controls predominant soil environments and associated vegetation. Well developed soils with dense grass cover extensively mantle the mesic north-aspect hillslopes, while more xeric south-aspect hillslopes are dominated by thin colluvium with minimal soil development, extensive bedrock exposure, and desertscrub vegetation. Remnants of older colluvium with moderately developed soils on south aspects, however, indicate they were once more extensively mantled by thicker colluvial deposits. The transition to drier conditions in the Holocene diminished vegetation cover on more xeric south aspects, triggering widespread erosion, whereas the more mesic north aspects retained denser grass cover that minimized erosion. The transition to drier conditions in the Holocene altered the vegetation; however, persistent perennial grass cover minimized erosion into the middle Holocene. Increasing aridity during the middle Holocene significantly reduced grass cover on more xeric south aspects, triggering erosion and alluvial deposition. OSL dates of dust incorporated into terrace sediments indicate late Middle Holocene aggradation and soil development in the Late Holocene. In contrast, maintenance of substantial perennial grass cover on mesic north aspects minimized erosion from those hillslopes throughout the Holocene.
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000735380200010
WOS关键词	LANDSCAPE DYNAMICS ; CALIFORNIA ; VEGETATION ; MOUNTAINS ; SEDIMENTATION ; AGGRADATION ; DEPOSITION
WOS类目	Geology
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/2XILL650/374369
作者单位	[Persico, L. P.; Stahlecker, T. E.; Dunn, S. B.; Brody, S. A. T.] Whitman Coll, Dept Geol, Walla Walla, WA 99362 USA; [McFadden, L. D.] Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA; [McAuliffe, J. R.] Desert Bot Garden, Phoenix, AZ 85008 USA; [Rittenour, T. M.] Utah State Univ, Dept Geosci, Logan, UT 84322 USA
推荐引用方式 GB/T 7714	Persico, L. P.,McFadden, L. D.,McAuliffe, J. R.,et al. Late Quaternary geochronologic record of soil formation and erosion: Effects of climate change on Mojave Desert hillslopes (Nevada, USA)[J],2022,50(1):54-59.
APA	Persico, L. P..,McFadden, L. D..,McAuliffe, J. R..,Rittenour, T. M..,Stahlecker, T. E..,...&Brody, S. A. T..(2022).Late Quaternary geochronologic record of soil formation and erosion: Effects of climate change on Mojave Desert hillslopes (Nevada, USA).GEOLOGY,50(1),54-59.
MLA	Persico, L. P.,et al."Late Quaternary geochronologic record of soil formation and erosion: Effects of climate change on Mojave Desert hillslopes (Nevada, USA)".GEOLOGY 50.1(2022):54-59.