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Wetland Soils as Regulators of the Quality and Quantity of...
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Wetland Soils as Regulators of the Quality and Quantity of Surface Water

A special issue of Geosciences (ISSN 2076-3263). This special issue belongs to the section "Geochemistry".

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 6258

Special Issue Editor

Dr. Malgorzata Grybos

E-Mail Website
Guest Editor
PEIRENE Laboratory, Faculty of Sciences and Techniques, Limoges University, Limoges, France
Interests: environmental geochemistry; freshwater quality; soils; sediments; redox; colloids; nutrient cycles; organic matter; mineral (bio)dissolution

Special Issue Information

Dear Colleagues,

Protecting and improving water resources for a sustainable future is a major challenge. In the context of global environmental changes, natural wetlands provide important key services for humanity and the planet, including hydrological regulation of rivers and elimination or transformation of various pollutants. Consequently, natural wetlands are increasingly valued as areas of interest in improving and maintaining surface water quality and quantity. However, beneficial services of natural wetlands to human and ecosystems are still difficult to estimate accurately. This applies, for example, to pollutants temporarily stored in wetlands, and sometimes released to water in an even more undesirable chemical form. This also applies to the aggregation of the role of wetlands at a catchment scale, with the consideration of small wetlands, whose overall role in water quality and quantity is difficult to assess quantitatively. It can also refer to the drying and re-wetting of some wetlands and the effect of drying time on the flushing response of dissolved, colloidal and particulate matter during floods.

This special issue of Geosciences aims to advance our understanding of the mechanisms and factors controlling the mobility of pollutants in natural wetlands soils, the conditions of pollutant transfer to surface water and sediments, and the impact of hydrological conditions on the overall biogeochemical functioning of wetlands. The editors invite contributions from studies with a synthetic view on how natural wetlands can influence the quality and quantity of surface waters (e.g., rivers, lakes), and how observed changes in hydrological regimes (e.g., from permanently saturated to dry-wet oscillating) affect the role of wetlands as a pollutant source and sink for surface water. They also seek for studies highlighting how wetlands can be used to manage the quality of surface waters, with a particular interest on studies aimed at assessing how small wetlands regulate water quality. We invite contributions on both large scale (catchment) and smaller scale (soil/water interface) studies.


Dr. Malgorzata Grybos
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Geosciences is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Wetlands soils
  • Surface-water composition
  • Nutrients
  • Metal(loid)s
  • Organic micropollutants
  • Colloids
  • Multidisciplinary
  • Transfer
  • Redox
  • Microbial processes

Published Papers (3 papers)

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Research

16 pages, 10628 KiB  
Article
Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil
by Asmaa Rouwane, Malgorzata Grybos, Marion Rabiet and Gilles Guibaud
Geosciences 2021, 11(11), 444; https://0-doi-org.brum.beds.ac.uk/10.3390/geosciences11110444 - 28 Oct 2021
Viewed by 1330
Abstract
The mobility of arsenic (As) and antimony (Sb) in soils is controlled by several processes (adsorption/desorption, (co)precipitation/dissolution and oxidation/reduction), depending on various environmental factors that are often convoluted and site-dependent. This study investigated: (i) the content and solid-phase distribution of geogenic As and [...] Read more.
The mobility of arsenic (As) and antimony (Sb) in soils is controlled by several processes (adsorption/desorption, (co)precipitation/dissolution and oxidation/reduction), depending on various environmental factors that are often convoluted and site-dependent. This study investigated: (i) the content and solid-phase distribution of geogenic As and Sb in a vertical soil profile (0–130 cm) of an agricultural wetland subject into alternating oxic and anoxic conditions induced by periodic waterlogging and (ii) identifies the stability of the As and Sb host phases during soil reduction (laboratory incubation) using a sequential extraction procedure (fractions: loosely and strongly adsorbed, carbonates, easily reducible, reducible, oxidable and residual). The field results showed that, in the deeper, permanently water-saturated soil layers (<60 cm), the amounts of As and Sb were relatively low (As: 8 ± 2 µg·g−1 and Sb: 0.9 ± 0.2 µg·g−1) and related to the Fe content. In the periodically flooded upper soil layers (0–40 cm), the amounts of As and Sb were higher compared to the deeper layers (As: 36 ± 3 µg·g−1 and Sb: 1.14 ± 0.05 µg·g−1). The observed enrichment towards the surface was attributed to the higher content of organic matter (for Sb) and metalloids distribution among the easily reducible fraction (for As). The anoxic laboratory incubation of periodically waterlogged soil showed that, during soil reduction, As is largely mobilized from the easily reducible fraction and undergoes partial readsorption. Unlike As, Sb displayed a higher affinity for more stable soil components (e.g., reducible and residual fractions), which highlights its limited mobility in periodically waterlogged soil compared to As. The potentially mobilizable As and Sb estimated as the sum of the acetate-exchangeable, P-exchangeable, easily reducible and H2O2-organic fractions represent up to 83%, 69% and 53% of the total As and up to 53%, 44% and 54% of the total Sb at 0–20-cm, 40–60-cm and 90–110-cm depths, respectively. Thus, unpolluted soils may act as sources of As and Sb to aquatic environments and therefore have negative consequence on the downstream water quality. Full article
(This article belongs to the Special Issue Wetland Soils as Regulators of the Quality and Quantity of Surface Water)
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14 pages, 2769 KiB  
Article
Monitoring the Organic Matter Quality Highlights the Ways in Which Organic Matter Is Removed from Wetland Soil
by Anne-Catherine Pierson-Wickmann, Mélanie Davranche, Julien Kerloc'h, Charlotte Catrouillet and Elaheh Lotfi-Kalahroodi
Geosciences 2021, 11(3), 134; https://0-doi-org.brum.beds.ac.uk/10.3390/geosciences11030134 - 13 Mar 2021
Cited by 1 | Viewed by 1587
Abstract
It has long been considered that ferric phases stabilize organic matter (OM) in soils. Temporarily waterlogged soils, in which Fe is submitted to regular reductive solubilization and oxidizing precipitation, have often been used to study these processes. However, few studies have been interested [...] Read more.
It has long been considered that ferric phases stabilize organic matter (OM) in soils. Temporarily waterlogged soils, in which Fe is submitted to regular reductive solubilization and oxidizing precipitation, have often been used to study these processes. However, few studies have been interested in the evolution of the OM quality under such conditions. We therefore experimentally investigated the impact of a redox cycle on the quality of the dissolved organic matter (DOM) from wetland soil. The DOM quality was monitored using a combination of analyses run on the elements (%C, %N, C/N), isotopes (δ15N, δ13C), optical index (specific UV absorbance at 254 nm), and fluorescence indexes (FI, HIX, BIX). In addition, the cation and anion concentrations were also determined in the soil solutions throughout the experiment. As classically demonstrated, OM is solubilized as terrestrial aromatic molecules in the first stage of the reducing period, and then as nonaromatic molecules until the end of the reduction, in response to the dissimilatory reductive dissolution of Fe-oxyhydroxides in the soil. More interestingly, we demonstrate that the reintroduction of O2 involves significant lysis of reducing bacterial cells involving the production of small labile organic carbon which represents a significant pathway for OM degradation. Moreover, in response to the physical constraints, the newly formed Fe-OM precipitates produce small aggregates rich in aromatic OM that are expected to disseminate in the environment, representing a second significant way to remove OM. Full article
(This article belongs to the Special Issue Wetland Soils as Regulators of the Quality and Quantity of Surface Water)
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14 pages, 814 KiB  
Article
Advancement of the Acetylene Inhibition Technique Using Time Series Analysis on Air-Dried Floodplain Soils to Quantify Denitrification Potential
by Ute Susanne Kaden, Elmar Fuchs, Christian Hecht, Thomas Hein, Holger Rupp, Mathias Scholz and Christiane Schulz-Zunkel
Geosciences 2020, 10(11), 431; https://0-doi-org.brum.beds.ac.uk/10.3390/geosciences10110431 - 29 Oct 2020
Cited by 6 | Viewed by 2569
Abstract
Denitrification in floodplain soils is one key process that determines the buffering capacity of riparian zones in terms of diffuse nitrate pollution. One widely used approach to measure the denitrification potential is the acetylene inhibition technique that requires fresh soil samples. We conducted [...] Read more.
Denitrification in floodplain soils is one key process that determines the buffering capacity of riparian zones in terms of diffuse nitrate pollution. One widely used approach to measure the denitrification potential is the acetylene inhibition technique that requires fresh soil samples. We conducted experiments with air-dried soils using a time series analysis to determine the optimal rewetting period. Thus, air-dried soil samples from six different floodplain areas in Germany were rewetted for 1 to 13days to 100% water-filled pore space. We analyzed nitrogen accumulated as N2O in the top of anaerobic flasks with and without acetylene by gas chromatography after four hours of incubation. We observed an overall optimal rewetting of at least seven days for complete denitrification. We also saw the strong influence of pH and field capacity on the denitrification product ratio; in soils with pH < 7, we hardly assumed complete denitrification, whereas the treatments with pH > 7 achieved stable values after seven days of rewetting. This advanced method provides the opportunity to carry out campaigns with large soil sample sizes on the landscape scale, as samples can be stored dry until measurements are taken. Full article
(This article belongs to the Special Issue Wetland Soils as Regulators of the Quality and Quantity of Surface Water)
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