Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.catena.2007.03.010 |
A soil chronosequence in the semi-arid environment of Patagonia (Argentina) | |
Sauer, Daniela; Schellmann, Gerhard; Stahr, Karl | |
通讯作者 | Sauer, Daniela |
会议名称 | International Conference on Global Soil Change - Time-Scales and Rates of Pedogenic Processes |
会议日期 | MAR 10-18, 2005 |
会议地点 | Mexico City, MEXICO |
英文摘要 | Soil development with time was investigated on beach ridges with ages ranging from about 1380 to 6240 14 C-years BP at the eastern coast of central Patagonia. The main pedogenic processes are accumulation of organic matter and carbonate leaching and accumulation within the upper part of the soils. Soil formation is strongly influenced by incorporation of eolian sediments into the interstitial spaces between the gravel of which the beach ridges are composed. Different amounts of eolian material in the soils lead to differentiation into Leptosols (containing <= 10% fine earth in the upper 75 cm) and Regosols (containing > 10% fine earth). Soil depth functions and chronofunctions of organic carbon, calcium carbonate, pH, Ca:Zr, Mg:Zr, K:Zr, Na:Zr, Fe:Zr, Mn:Zr, and Si:Al (obtained from X-ray fluorescence analysis) were evaluated. To establish soil chronofunctions mean values of the horizon data of 0-10 cm below the desert pavement were used, which were weighted according to the horizon thicknesses. The depth function of pH shows a decrease towards the surface, indicating leaching of bases from the upper centimeters. Chronofunctions of pH show that within 6000 radiocarbon years of soil development pH drops from 7.0 to 6.6 in the Leptosols and from 8.1 to 7.5 in the Regosols. The higher pH of the Regosols is due to input of additional bases from the eolian sediments. Chronofunctions of Ca:Zr and indicate progressive leaching of Ca and K in the Regosols, showing close relationships to time (R-2=0.972 and 0.995). Na leaching as indicated by decreasing Na:Zr ratios shows a strong correlation to time only in the Leptosols (R-2=0.999). Both, Leptosols and Regosols show close relationships to time for Fe:Zr (R-2=0.817 and 0.824), Mn:Zr (R-2=0.940 and 0.803), and Si:Al (0.971 and 0.977), indicating enrichment of Fe and Mn and leaching of Si. Leaching of mobile elements takes place on a higher level in the Regosols than in the Leptosols from the beginning of soil formation. Hence, a significant part of the eolian sediments must have been incorporated into the beach ridges very soon after their formation. (c) 2007 Elsevier B.V. All rights reserved. |
英文关键词 | soil chronosequence beach ridges patagonia Eolian sediments calcium carbonate accumulation soil chronofunctions |
来源出版物 | CATENA |
ISSN | 0341-8162 |
出版年 | 2007 |
卷号 | 71 |
期号 | 3 |
页码 | 382-393 |
出版者 | ELSEVIER SCIENCE BV |
类型 | Article;Proceedings Paper |
语种 | 英语 |
国家 | Germany |
收录类别 | CPCI-S ; SCI-E |
WOS记录号 | WOS:000250946200003 |
WOS关键词 | QUATERNARY MARINE TERRACES ; CHEMICAL-WEATHERING RATES ; MICROMORPHOLOGICAL INDEX ; GRANITIC ALLUVIUM ; SOUTHERN-NORWAY ; LJUBLJANA BASIN ; CLAY-MINERALS ; MASS-BALANCE ; DUST ; EVOLUTION |
WOS类目 | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
WOS研究方向 | Geology ; Agriculture ; Water Resources |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/296415 |
作者单位 | (1)Univ Hohenheim, Inst Soil Sci, D-70599 Stuttgart, Germany;(2)Univ Bamberg, Inst Geog, D-96045 Bamberg, Germany |
推荐引用方式 GB/T 7714 | Sauer, Daniela,Schellmann, Gerhard,Stahr, Karl. A soil chronosequence in the semi-arid environment of Patagonia (Argentina)[C]:ELSEVIER SCIENCE BV,2007:382-393. |
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