干旱区生态环境知识资源中心(Arid): Comparison of soil production, chemical weathering, and physical erosion rates along a climate and ecological gradient (Chile) to global observations

Arid

DOI	10.5194/esurf-10-131-2022
	Comparison of soil production, chemical weathering, and physical erosion rates along a climate and ecological gradient (Chile) to global observations
	Schaller, Mirjam; Ehlers, Todd A.
通讯作者	Schaller, M (corresponding author)，Univ Tubingen, Dept Geosci, Schnarrenbergstr 94-96, D-72076 Tubingen, Germany.
来源期刊	EARTH SURFACE DYNAMICS
ISSN	2196-6311
EISSN	2196-632X
出版年	2022
卷号	10 期号:1 页码:131-150
英文摘要	Weathering of bedrock to produce regolith is essential for sustaining life on Earth and global biogeochemical cycles. The rate of this process is influenced not only by tectonics, but also by climate and biota. We present new data on soil production, chemical weathering, and physical erosion rates from the large climate and ecological gradient of the Chilean Coastal Cordillera (26 to 38 degrees S). Four Chilean study areas are investigated and span (from north to south) arid (Pan de Azucar), semi-arid (Santa Gracia), Mediterranean (La Campana), and temperate humid (Nahuelbuta) climate zones. Observed soil production rates in granitoid soil-mantled hillslopes range from similar to 7 to 290 t km(-2) yr(-1) and are lowest in the sparsely vegetated and arid north and highest in the Mediterranean setting. Calculated chemical weathering rates range from zero in the arid north to a high of 211 t km(-2) yr(-1) in the Mediterranean zone. Chemical weathering rates are moderate in the semi-arid and temperate humid zones (similar to 20 to 50 t km(-2) yr(-1)). Similarly, physical erosion rates are lowest in the arid zone (similar to 11 t km(-2) yr(-1)) and highest in the Mediterranean climate zone (similar to 91 t km(-2) yr(-1)). The contribution of chemical weathering to total denudation rates is lower in the arid north than further south. However, due to heterogeneities in lithologies and Zr concentrations, reported chemical weathering rates and chemical depletion fractions are affected by large uncertainties. Comparison of Chilean results to published global data collected from hillslope settings underlain by granitoid lithologies documents similar patterns in soil production, chemical weathering, and total denudation rates for varying mean annual precipitation and vegetation cover amounts. We discuss the Chilean and global data in the light of contending model frameworks in the literature and find that observed variations in soil production rates bear the closest resemblance to models explicitly accounting for variations in soil thickness and biomass.
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000759196100001
WOS关键词	CHANGING VEGETATION ; COASTAL CORDILLERA ; CHANGE RELEVANT ; CRITICAL ZONE ; DENUDATION ; DEPTH ; SAPROLITE ; COVER ; PRECIPITATION ; ESCARPMENT
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376293
作者单位	[Schaller, Mirjam; Ehlers, Todd A.] Univ Tubingen, Dept Geosci, Schnarrenbergstr 94-96, D-72076 Tubingen, Germany
推荐引用方式 GB/T 7714	Schaller, Mirjam,Ehlers, Todd A.. Comparison of soil production, chemical weathering, and physical erosion rates along a climate and ecological gradient (Chile) to global observations[J],2022,10(1):131-150.
APA	Schaller, Mirjam,&Ehlers, Todd A..(2022).Comparison of soil production, chemical weathering, and physical erosion rates along a climate and ecological gradient (Chile) to global observations.EARTH SURFACE DYNAMICS,10(1),131-150.
MLA	Schaller, Mirjam,et al."Comparison of soil production, chemical weathering, and physical erosion rates along a climate and ecological gradient (Chile) to global observations".EARTH SURFACE DYNAMICS 10.1(2022):131-150.