DOI: 10.1016/j.epsl.2018.02.026
Scopus记录号: 2-s2.0-85042907805
论文题名: Addressing the contribution of climate and vegetation cover on hillslope denudation, Chilean Coastal Cordillera (26°–38°S)
作者: Schaller M. ; Ehlers T.A. ; Lang K.A.H. ; Schmid M. ; Fuentes-Espoz J.P.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 489 起始页码: 111
结束页码: 122
语种: 英语
英文关键词: biota
; Chile
; climate
; cosmogenic nuclide
; denudation
; hillslope
Scopus关键词: Facings
; Tectonics
; Vegetation
; biota
; Chile
; climate
; Cosmogenic nuclides
; denudation
; Hillslopes
; Earth (planet)
; biota
; climate forcing
; cosmogenic radionuclide
; denudation
; environmental factor
; environmental gradient
; erosion rate
; hillslope
; vegetation cover
; Chile
; Coastal Cordillera
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 10Be 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 ∼0.46 to ∼5.65 cm/kyr and then decrease to ∼3.22 cm/kyr in the southernmost, highest vegetation cover, study area. Calculated turnover times of soils decrease from ∼30 to ∼11 kyr and then increase 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. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109964
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: University of Tuebingen, Department of Geosciences, Wilhelmstrasse 56, Tuebingen, 72074, Germany; Stockholm University, Department of Geological Sciences, Svante Arrhenius väg 8, Stockholm, 106 91, Sweden; University of Chile, Department of Silviculture and Nature Conservation, Av. Santa Rosa 11315, La Pintana, RM, Santiago, Chile
Recommended Citation:
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°–38°S)[J]. Earth and Planetary Science Letters,2018-01-01,489