Arid
DOI10.1016/j.geoderma.2008.07.011
A soil chronosequence study of the Reno valley, Italy: Insights into the relative role of climate versus anthropogenic forcing on hillslope processes during the mid-Holocene
Eppes, Martha Cary1; Bierma, Ryan1; Vinson, David1; Pazzaglia, Frank2
通讯作者Eppes, Martha Cary
来源期刊GEODERMA
ISSN0016-7061
EISSN1872-6259
出版年2008
卷号147期号:3-4页码:97-107
英文摘要

Relatively few soil chronosequences with good age control exist for Late Pleistocene and Holocene deposits in the Mediterranean region of Europe, yet surface soils and their Young buried counterparts can provide meaningful information about the timing and processes of landscape response to external forcing such as climate or anthropogenic change. Here we present the results of a study that examines a well-dated chronosequence of nineteen soil exposures in surficial deposits ranging in age from hundreds of years to hundreds of thousands of years located in the Reno River Valley near Bologna, Italy. The soil-forming climate of the Reno Valley sits on a threshold between that which facilitates the accumulation of CaCO3 and that which facilitates the translocation and formation of clay minerals and iron oxides. Once formed, secondary iron oxides are relatively immobile in oxidizing conditions in the soil profile and therefore consistently record age trends, with Feo/Fed ratios decreasing predictably with soil age for all soils in the chronosequence. The morphology of secondary carbonate accumulation and its depth of leaching also vary predictably with soil age, but only for soils younger than about similar to 12,000 years. In these young soils, horizons that contain secondary carbonate progress from relatively shallow, Stage I Bk horizons in late Holocene-aged soils to deeper Stage III Bk horizons in latest-Pleistocene aged soils. In soils older than approximately 12,000 cal ybp, however, carbonate dissolution during wetter climates and the addition of colluviurn and/or dust to terrace surfaces become important factors in the preservation of carbonate in the profile, and carbonate content is not predictable by age alone. Without significant depositional additions, these older soils become decalcified. Pedogenic carbonate precipitated during drier climates is susceptible to dissolution during wetter periods, as evidenced by discontinuous carbonate coatings on grains in some soils. Therefore overall measurable pedogenic carbonate content is spatially and temporally variable as a function of input of fresh carbonate and locally-controlled soil moisture conditions. Particle size does not decrease predictably with soil age for Reno Valley soils and appears to be strongly influenced by parent material variability in younger soils and by dust additions in older soils.


Our detailed examination of soil stratigraphy in the Reno Valley revealed evidence of significant aggradation of colluvium and tributary fans in the middle Holocene between similar to 6000 and similar to 4000 ybp. This aggradation pre-dates Bronze Age agricultural expansion, and appears to be instead attributable to the climate conditions of the middle Holocene that have been documented elsewhere in Italy for this time period. This study demonstrates that late Pleistocene and Holocene surface soils in the Mediterranean region of Europe can effectively help elucidate rates and processes of landscape evolution. (C) 2008 Elsevier B.V. All rights reserved.


英文关键词Chronosequence Soil dynamics Mediterranean Terrace Landscape evolution Calcrete
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000260753000001
WOS关键词RADIOCARBON CALIBRATION ; ENVIRONMENTAL-CHANGES ; ALLUVIAL FANS ; MOJAVE DESERT ; PO PLAIN ; HOLOCENE ; CALIFORNIA ; USA ; RATES ; LANDSLIDES
WOS类目Soil Science
WOS研究方向Agriculture
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/157407
作者单位1.Univ N Carolina, Dept Geog & Earth Sci, Charlotte, NC 28223 USA;
2.Lehigh Univ, Dept Earth & Environm Sci, Bethlehem, PA 18015 USA
推荐引用方式
GB/T 7714
Eppes, Martha Cary,Bierma, Ryan,Vinson, David,et al. A soil chronosequence study of the Reno valley, Italy: Insights into the relative role of climate versus anthropogenic forcing on hillslope processes during the mid-Holocene[J],2008,147(3-4):97-107.
APA Eppes, Martha Cary,Bierma, Ryan,Vinson, David,&Pazzaglia, Frank.(2008).A soil chronosequence study of the Reno valley, Italy: Insights into the relative role of climate versus anthropogenic forcing on hillslope processes during the mid-Holocene.GEODERMA,147(3-4),97-107.
MLA Eppes, Martha Cary,et al."A soil chronosequence study of the Reno valley, Italy: Insights into the relative role of climate versus anthropogenic forcing on hillslope processes during the mid-Holocene".GEODERMA 147.3-4(2008):97-107.
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