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Publication Type J
Authors Rios, I; Bouza, PJ; Bortolus, A; Alvarez, MD
Author Full Name Rios, Ileana; Jose Bouza, Pablo; Bortolus, Alejandro; del Pilar Alvarez, Maria
Title Soil-geomorphology relationships and landscape evolution in a southwestern Atlantic tidal salt marsh in Patagonia, Argentina
Source JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
Language English
Document Type Article
Author Keywords Hydromorphic soils; Grain-size distribution; Semi-desert salt marsh; Carbon stable isotopes; Vascular plants
Keywords Plus ACID SULFATE SOILS; SPARTINA-ALTERNIFLORA; SIZE DISTRIBUTION; PENINSULA VALDES; ORGANIC MATERIAL; PLANT ZONATION; C/N RATIOS; SEA-LEVEL; CARBON; VEGETATION
Abstract Salt marshes in Patagonia ecosystem are nowadays fully recognized by ecological, pollution and phytoremediation studies but a soil genesis and geomorphology approach is currently unknown. The aim of this study was to establish the soil-geomorphology relationship in Fracasso salt marsh and to determine the successional vegetation dynamics associated with the landscape evolution. This work was carried out in Fracasso salt marsh sited in Peninsula Valdes, Argentina, where an integrated study on soil-geomorphology relationship and landscape evolution was performed along with sedimentological analysis and vegetation changes (C3 photosynthesis pathway vs. C4 photosynthesis pathway plants). This last was determined through the delta C-13 composition from soil organic matter (SOM). Soil descriptions and laboratory analysis of soil samples were performed. A marked relationship between the vegetation unit, the dominant landform and the type of associated soil was found. Limoniwn brasiliense (Lb) and Sarcocornia perennis (Sp), both C3 plants, are dominant in levees associated with tidal creeks, and soils were classified as Typic Fluvaquents, while Spartina alterniflora (Sa) soils were classified as Sodic Endoaquents and Sodic Psammaquents. Although no sulfidic materials were identified by incubation test, they were identified by hydrogen peroxide treatment in Sa soils, and now are considered potential acid sulfate soils (PASS). Sedimentological analysis from deepest sandy C horizons indicates a beach depositional environment. On the other hand, the delta C-13 stable isotope composition of SOM preserved into these buried soil acting as parent materials shows the dominance of C4 plants presumably belonging to Swarm species, suggesting a possible colonization and stabilization as the pioneer salt marsh.
Author Address [Rios, Ileana; Jose Bouza, Pablo; Bortolus, Alejandro; del Pilar Alvarez, Maria] Inst Patagon El Estudio Ecosistemas Continentales, Blvd Brown 2825,CP U9120 ACF, Puerto Madryn, Chubut, Argentina
Reprint Address Rios, I (reprint author), Inst Patagon El Estudio Ecosistemas Continentales, Blvd Brown 2825,CP U9120 ACF, Puerto Madryn, Chubut, Argentina.
E-mail Address irios@cenpat-conicet.gob.ar
Funding Agency and Grant Number Consejo Nacional de Investigaciones Cientificas y Tecnologicas (CONICET) [PIP 2014 00190 CO, 191]; Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 2013-1876]
Funding Text The authors wish to thank Claudia Sain and Estela Cortes for their exceptional assistance at fieldwork and laboratory. We also greatly appreciate the reviewers for their comments and suggestions. This work is based on the Doctoral Thesis defended by the first author at the Universidad Nacional de Cordoba in 2015. This research has been funded by the Consejo Nacional de Investigaciones Cientificas y Tecnologicas (CONICET, Grant number: PIP 2014 00190 CO, and 191) and Agencia Nacional de Promocion Cientifica y Tecnologica (Grant number: PICT 2013-1876).
Cited Reference Count 77
Publisher PERGAMON-ELSEVIER SCIENCE LTD
Publisher City OXFORD
Publisher Address THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
ISSN 0895-9811
29-Character Source Abbreviation J S AM EARTH SCI
ISO Source Abbreviation J. South Am. Earth Sci.
Publication Date JUL
Year Published 2018
Volume 84
Beginning Page 385
Ending Page 398
Digital Object Identifier (DOI) 10.1016/j.jsames.2018.04.015
Page Count 14
Web of Science Category Geosciences, Multidisciplinary
Subject Category Geology
Document Delivery Number GJ1SW
Unique Article Identifier WOS:000435049100027
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