Arid
DOI10.1016/j.epsl.2018.02.026
Addressing the contribution of climate and vegetation cover on hillslope denudation, Chilean Coastal Cordillera (26 degrees-38 degrees S)
Schaller, M.1; Ehlers, T. A.1; Lang, K. A. H.1,2; Schmid, M.1; Fuentes-Espoz, J. P.3
通讯作者Schaller, M.
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
EISSN1385-013X
出版年2018
卷号489页码:111-122
英文摘要

The Earth surface is modulated by interactions among tectonics, climate, and biota. The influence of each of these factors on hillslope denudation rates is difficult to disentangle. The Chilean Coastal Cordillera offers a strong climate and vegetation gradient from arid and unvegetated in the North to humid and vegetated in the South. A similar (convergent) plate tectonic boundary lies to the West of the Coastal Cordillera. We present eight depth profiles analyzed for in situ-produced cosmogenic Be-10 in four study areas. These profiles reveal denudation rates of soil-mantled hillslopes and the depth of mobile layers. Depth profiles were investigated from both S- and N-facing mid-slope positions. Results indicate the depth of the mobile layers in the four study areas increase from N to S in latitude. When mixing is present in the mobile layers they are completely mixed. In the S- and N-facing hillslopes of each study area, mid-slope positions do not show a systematic change in depth of the mobile layers nor in denudation rates based on cosmogenic depth profiles. From N to S in latitude, modelled denudation rates of hillslopes increase from similar to 0.46 to similar to 5.65 cm/kyr and then decrease to similar to 3.22 cm/kyr in the southernmost, highest vegetation cover, study area. Calculated turnover times of soils decrease from 30 to similar to 11 kyr and then increase to similar to 22 kyr. In this work, the increasing denudation rates are attributed to increasing mean annual precipitation from N to S. However, despite the ongoing increase in precipitation from N to S, the denudation rate in the southernmost location does not continue to increase due to the protective nature of increasing vegetation cover. This indicates a vegetation induced non-linear relationship with denudation rates. (C) 2018 Elsevier B.V. All rights reserved.


英文关键词denudation hillslope climate biota cosmogenic nuclide Chile
类型Article
语种英语
国家Germany ; Sweden ; Chile
收录类别SCI-E
WOS记录号WOS:000430767500012
WOS关键词COSMOGENIC NUCLIDES ; EROSION RATES ; OCTODON-DEGUS ; HALF-LIFE ; BE-10 ; SEDIMENT ; REGOLITH ; RODENT ; FOREST ; UPLIFT
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/208601
作者单位1.Univ Tubingen, Dept Geosci, Wilhelmstr 56, Tubingen, Germany;
2.Stockholm Univ, Dept Geol Sci, Svante Arrhenius Vag 8, S-10691 Stockholm, Sweden;
3.Univ Chile, Dept Silviculture & Nat Conservat, Av Santa Rosa 11315, La Pintana, Santiago Rm, Chile
推荐引用方式
GB/T 7714
Schaller, M.,Ehlers, T. A.,Lang, K. A. H.,et al. Addressing the contribution of climate and vegetation cover on hillslope denudation, Chilean Coastal Cordillera (26 degrees-38 degrees S)[J],2018,489:111-122.
APA Schaller, M.,Ehlers, T. A.,Lang, K. A. H.,Schmid, M.,&Fuentes-Espoz, J. P..(2018).Addressing the contribution of climate and vegetation cover on hillslope denudation, Chilean Coastal Cordillera (26 degrees-38 degrees S).EARTH AND PLANETARY SCIENCE LETTERS,489,111-122.
MLA Schaller, M.,et al."Addressing the contribution of climate and vegetation cover on hillslope denudation, Chilean Coastal Cordillera (26 degrees-38 degrees S)".EARTH AND PLANETARY SCIENCE LETTERS 489(2018):111-122.
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