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Yu C, Luong NT, Hefni ME, Song Z, Högfors-Rönnholm E, Engblom S, Xie S, Chernikov R, Broström M, Boily JF, Åström ME. Storage and Distribution of Organic Carbon and Nutrients in Acidic Soils Developed on Sulfidic Sediments: The Roles of Reactive Iron and Macropores. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:9200-9212. [PMID: 38743440 PMCID: PMC11137870 DOI: 10.1021/acs.est.3c11007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 04/11/2024] [Accepted: 05/07/2024] [Indexed: 05/16/2024]
Abstract
In a boreal acidic sulfate-rich subsoil (pH 3-4) developing on sulfidic and organic-rich sediments over the past 70 years, extensive brownish-to-yellowish layers have formed on macropores. Our data reveal that these layers ("macropore surfaces") are strongly enriched in 1 M HCl-extractable reactive iron (2-7% dry weight), largely bound to schwertmannite and 2-line ferrihydrite. These reactive iron phases trap large pools of labile organic matter (OM) and HCl-extractable phosphorus, possibly derived from the cultivated layer. Within soil aggregates, the OM is of a different nature from that on the macropore surfaces but similar to that in the underlying sulfidic sediments (C-horizon). This provides evidence that the sedimentary OM in the bulk subsoil has been largely preserved without significant decomposition and/or fractionation, likely due to physiochemical stabilization by the reactive iron phases that also existed abundantly within the aggregates. These findings not only highlight the important yet underappreciated roles of iron oxyhydroxysulfates in OM/nutrient storage and distribution in acidic sulfate-rich and other similar environments but also suggest that boreal acidic sulfate-rich subsoils and other similar soil systems (existing widely on coastal plains worldwide and being increasingly formed in thawing permafrost) may act as global sinks for OM and nutrients in the short run.
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Affiliation(s)
- Changxun Yu
- Department
of Biology and Environmental Science, Linnaeus
University, 39231 Kalmar, Sweden
| | | | - Mohammed E. Hefni
- Department
of Chemistry and Biomedical Sciences, Linnaeus
University, 39231 Kalmar, Sweden
| | - Zhaoliang Song
- Institute
of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
| | - Eva Högfors-Rönnholm
- Research
and Development, Novia University of Applied
Sciences, 65200 Vaasa, Finland
| | - Sten Engblom
- Research
and Development, Novia University of Applied
Sciences, 65200 Vaasa, Finland
| | - Shurong Xie
- School
of
Earth Sciences, East China University of
Technology, Nanchang 330013, China
| | - Roman Chernikov
- Canadian
Light Source, 44 Innovation
Boulevard, Saskatoon, Saskatchewan S7N 2 V3, Canada
| | - Markus Broström
- Thermochemical
Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University, 90187 Umeå, Sweden
| | | | - Mats E. Åström
- Department
of Biology and Environmental Science, Linnaeus
University, 39231 Kalmar, Sweden
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Xu C, Wong VNL, Tuovinen A, Simojoki A. Effects of liming on oxic and anoxic N 2O and CO 2 production in different horizons of boreal acid sulfate soil and non-acid soil under controlled conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159505. [PMID: 36257417 DOI: 10.1016/j.scitotenv.2022.159505] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 10/10/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
In acid sulfate (AS) soils, organic rich topsoil and subsoil horizons with highly variable acidity and moisture conditions and interconnected reactions of sulfur and nitrogen make them potential sources of greenhouse gases (GHGs). Subsoil liming can reduce the acidification of sulfidic subsoils in the field. However, the mitigation of GHG production in AS subsoils by liming, and the mechanisms involved, are still poorly known. We limed samples from different horizons of AS and non-AS soils to study the effects of liming on the N2O and CO2 production during a 56-day oxic and subsequent 72-h anoxic incubation. Liming to pH ≥ 7 decreased oxic N2O production by 97-98 % in the Ap1 horizon, 38-50 % in the Bg1 horizon, and 34-36 % in the BC horizon, but increased it by 136-208 % in the C horizon, respectively. Liming decreased anoxic N2O production by 86-94 % and 78-91 % in Ap1 and Bg1 horizons, but increased it by 100-500 % and 50-162 % in BC and C horizons, respectively. Liming decreased N2O/(N2O + N2) in anoxic denitrification in most horizons of both AS and non-AS soils. Liming significantly increased the cumulative oxic and anoxic CO2 production in AS soil, but less so in non-AS soil due to the initial high soil pH. Higher carbon and nitrogen contents in AS soil compared to non-AS soil agreed with the respectively higher cumulative oxic N2O production in all horizons, and the higher CO2 production in the subsoil horizons of all lime treatments. Overall, liming reduced the proportion of N2O in the GHGs produced in most soil horizons under oxic and anoxic conditions but reduced the total GHG production (as CO2 equivalents) only in the Ap1 horizon of both soils. The results suggest that liming of subsoils may not always effectively mitigate GHG emissions due to concurrently increased CO2 production and denitrification.
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Affiliation(s)
- Chang Xu
- School of Earth, Atmosphere and Environment, Monash University, Wellington Road, Clayton, VIC 3800, Australia
| | - Vanessa N L Wong
- School of Earth, Atmosphere and Environment, Monash University, Wellington Road, Clayton, VIC 3800, Australia
| | - Anna Tuovinen
- Department of Agricultural Sciences, University of Helsinki, P. O. Box 56 (Biocenter 1, Viikinkaari 9), FI-00014, Finland
| | - Asko Simojoki
- Department of Agricultural Sciences, University of Helsinki, P. O. Box 56 (Biocenter 1, Viikinkaari 9), FI-00014, Finland.
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Yli-Halla M, Virtanen S, Regina K, Österholm P, Ehnvall B, Uusi-Kämppä J. Nitrogen stocks and flows in an acid sulfate soil. ENVIRONMENTAL MONITORING AND ASSESSMENT 2020; 192:751. [PMID: 33156467 PMCID: PMC7648014 DOI: 10.1007/s10661-020-08697-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 10/20/2020] [Indexed: 05/31/2023]
Abstract
Besides causing acidification, acid sulfate (AS) soils contain large nitrogen (N) stocks and are a potential source of N loading to waters and nitrous oxide (N2O) emissions. We quantified the stocks and flows of N, including crop yields, N leaching, and N2O emissions, in a cultivated AS soil in western Finland. We also investigated whether controlled drainage (CD) and sub-irrigation (CDI) to keep the sulfidic horizons inundated can alleviate N losses. Total N stock at 0-100 cm (19.5 Mg ha-1) was smaller than at 100-200 cm (26.6 Mg ha-1), and the mineral N stock was largest below 170 cm. Annual N leaching (31-91 kg N ha-1) plus N in harvested grain (74-122 kg N ha-1) was 148% (range 118-189%) of N applied in fertilizers (90-125 kg N ha-1) in 2011-2017, suggesting substantial N supply from soil reserves. Annual emissions of N2O measured during 2 years were 8-28 kg N ha-1. The most probable reasons for high N2O emission rates in AS soils are concomitant large mineral N pools with fluctuating redox conditions and low pH in the oxidized subsoil, all favoring formation of N2O in nitrification and denitrification. Although the groundwater level was higher in CD and CDI than in conventional drainage, N load and crop offtake did not differ between the drainage methods, but there were differences in emissions. Nitrogen flows to the atmosphere and drainage water were clearly larger than those in non-AS mineral soils indicating that AS soils are potential hotspots of environmental impacts.
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Affiliation(s)
- Markku Yli-Halla
- Department of Agricultural Sciences, University of Helsinki, P.O. Box 56, 00014, Helsinki, Finland.
| | - Seija Virtanen
- Drainage Foundation sr., Simonkatu 12 B, 00100, Helsinki, Finland
| | - Kristiina Regina
- Natural Resources Institute Finland, Tietotie 4, 31600, Jokioinen, Finland
| | - Peter Österholm
- Åbo Akademi University, Akatemiankatu 1, 20500, Turku, Finland
| | - Betty Ehnvall
- Natural Resources Institute Finland, Tietotie 4, 31600, Jokioinen, Finland
- Swedish University of Agricultural Sciences, Skogsmarksgränd 17, 90183, Umeå, Sweden
| | - Jaana Uusi-Kämppä
- Natural Resources Institute Finland, Tietotie 4, 31600, Jokioinen, Finland
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Jílková V, Picek T, Šestauberová M, Krištůfek V, Cajthaml T, Frouz J. Methane and carbon dioxide flux in the profile of wood ant (Formica aquilonia) nests and the surrounding forest floor during a laboratory incubation. FEMS Microbiol Ecol 2016; 92:fiw141. [DOI: 10.1093/femsec/fiw141] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2016] [Indexed: 11/14/2022] Open
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Wu X, Sten P, Engblom S, Nowak P, Österholm P, Dopson M. Impact of mitigation strategies on acid sulfate soil chemistry and microbial community. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 526:215-221. [PMID: 25933291 DOI: 10.1016/j.scitotenv.2015.04.049] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 04/13/2015] [Accepted: 04/13/2015] [Indexed: 06/04/2023]
Abstract
Potential acid sulfate soils contain reduced iron sulfides that if oxidized, can cause significant environmental damage by releasing large amounts of acid and metals. This study examines metal and acid release as well as the microbial community capable of catalyzing metal sulfide oxidation after treating acid sulfate soil with calcium carbonate (CaCO3) or calcium hydroxide (Ca(OH)2). Leaching tests of acid sulfate soil samples were carried out in the laboratory. The pH of the leachate during the initial flushing with water lay between 3.8 and 4.4 suggesting that the jarosite/schwertmannite equilibrium controls the solution chemistry. However, the pH increased to circa 6 after treatment with CaCO3 suspension and circa 12 after introducing Ca(OH)2 solution. 16S rRNA gene sequences amplified from community DNA extracted from the untreated and both CaCO3 and Ca(OH)2 treated acid sulfate soils were most similar to bacteria (69.1% to 85.7%) and archaea (95.4% to 100%) previously identified from acid and metal contaminated environments. These species included a Thiomonas cuprina-like and an Acidocella-like bacteria as well as a Ferroplasma acidiphilum-like archeon. Although the CaCO3 and Ca(OH)2 treatments did not decrease the proportion of microorganisms capable of accelerating acid and metal release, the chemical effects of the treatments suggested their reduced activity.
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Affiliation(s)
- Xiaofen Wu
- Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden.
| | - Pekka Sten
- Energy & Environmental Technology, Vaasa University of Applied Sciences, Vaasa, Finland.
| | - Sten Engblom
- R&D Department, Novia University of Applied Sciences, Vaasa, Finland.
| | - Pawel Nowak
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Kraków, Poland.
| | - Peter Österholm
- Department of Geology and Mineralogy, Åbo Akademi University, Åbo, Finland.
| | - Mark Dopson
- Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden.
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Ling YC, Bush R, Grice K, Tulipani S, Berwick L, Moreau JW. Distribution of iron- and sulfate-reducing bacteria across a coastal acid sulfate soil (CASS) environment: implications for passive bioremediation by tidal inundation. Front Microbiol 2015; 6:624. [PMID: 26191042 PMCID: PMC4490247 DOI: 10.3389/fmicb.2015.00624] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 06/08/2015] [Indexed: 11/13/2022] Open
Abstract
Coastal acid sulfate soils (CASS) constitute a serious and global environmental problem. Oxidation of iron sulfide minerals exposed to air generates sulfuric acid with consequently negative impacts on coastal and estuarine ecosystems. Tidal inundation represents one current treatment strategy for CASS, with the aim of neutralizing acidity by triggering microbial iron- and sulfate-reduction and inducing the precipitation of iron-sulfides. Although well-known functional guilds of bacteria drive these processes, their distributions within CASS environments, as well as their relationships to tidal cycling and the availability of nutrients and electron acceptors, are poorly understood. These factors will determine the long-term efficacy of "passive" CASS remediation strategies. Here we studied microbial community structure and functional guild distribution in sediment cores obtained from 10 depths ranging from 0 to 20 cm in three sites located in the supra-, inter- and sub-tidal segments, respectively, of a CASS-affected salt marsh (East Trinity, Cairns, Australia). Whole community 16S rRNA gene diversity within each site was assessed by 454 pyrotag sequencing and bioinformatic analyses in the context of local hydrological, geochemical, and lithological factors. The results illustrate spatial overlap, or close association, of iron-, and sulfate-reducing bacteria (SRB) in an environment rich in organic matter and controlled by parameters such as acidity, redox potential, degree of water saturation, and mineralization. The observed spatial distribution implies the need for empirical understanding of the timing, relative to tidal cycling, of various terminal electron-accepting processes that control acid generation and biogeochemical iron and sulfur cycling.
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Affiliation(s)
- Yu-Chen Ling
- School of Earth Sciences, University of MelbourneMelbourne, VIC, Australia
| | - Richard Bush
- Southern Cross GeoScience, Southern Cross UniversityLismore, NSW, Australia
| | - Kliti Grice
- Department of Chemistry, Western Australia Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, Curtin UniversityPerth, WA, Australia
| | - Svenja Tulipani
- Department of Chemistry, Western Australia Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, Curtin UniversityPerth, WA, Australia
| | - Lyndon Berwick
- Department of Chemistry, Western Australia Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, Curtin UniversityPerth, WA, Australia
| | - John W. Moreau
- School of Earth Sciences, University of MelbourneMelbourne, VIC, Australia
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Mulec J, Krištůfek V, Chroňáková A, Oarga A, Scharfen J, Šestauberová M. Microbiology of healing mud (fango) from Roman thermae aquae iasae archaeological site (Varaždinske Toplice, Croatia). MICROBIAL ECOLOGY 2015; 69:293-306. [PMID: 25241172 DOI: 10.1007/s00248-014-0491-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 09/01/2014] [Indexed: 06/03/2023]
Abstract
We found well-preserved, rocky artefacts that had been buried in the healing mud (fango) for more than 1,500 years at the Roman archaeological site at Varaždinske Toplice. This Roman pool with fango sediments and artefacts is fed from hot sulphidic springs. The fango exhibited nearly neutral pH, a high level of organic C, an elevated concentration of heavy metals and a high total microbial biomass, greater than 10(8) cells per gram of dry weight. The dominant microbes, assessed by molecular profiling (denaturing gradient gel electrophoresis), were affiliated with Thiobacillus, Sulfuricurvum, Polaromonas, and Bdellovibrio. Polymerase chain reaction screening for microbial functional guilds revealed the presence of sulphur oxidizers and methanogens but no sulphate reducers. The dominance of four Proteobacterial classes (α-, β-, δ- and ε-Proteobacteria) was confirmed by fluorescence in situ hybridisation; Actinobacteria were less abundant. Cultivable bacteria represented up to 23.4 % of the total bacterial counts when cultivation media was enriched with fango. These bacteria represented the genera Acinetobacter, Aeromonas, Arthrobacter, Comamonas, Ewingella, Flavobacterium, Pseudomonas, Rahnella and Staphylococcus. This study showed that the heterogeneous nature of fango at neutral pH created various microniches, which largely supported microbial life based on sulphur-driven, autotrophic denitrification.
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Affiliation(s)
- Janez Mulec
- Research Centre of the Slovenian Academy of Sciences and Arts, Karst Research Institute, Titov trg 2, 6230, Postojna, Slovenia,
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Virtanen S, Simojoki A, Hartikainen H, Yli-Halla M. Response of pore water Al, Fe and S concentrations to waterlogging in a boreal acid sulphate soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 485-486:130-142. [PMID: 24704964 DOI: 10.1016/j.scitotenv.2014.03.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Revised: 03/07/2014] [Accepted: 03/16/2014] [Indexed: 06/03/2023]
Abstract
Environmental hazards caused by acid sulphate (AS) soils are of worldwide concern. Among various mitigation measures, waterlogging has mainly been studied in subtropical and tropical conditions. To assess the environmental relevance of waterlogging as a mitigation option in boreal AS soils, we arranged a 2.5-year experiment with monolithic lysimeters to monitor changes in the soil redox potential, pH and the concentrations of aluminium (Al), iron (Fe) and sulphur (S) in pore water in response to low and high groundwater levels in four AS soil horizons. The monoliths consisted of acidic oxidized B horizons and a reduced C horizon containing sulphidic material. Eight lysimeters were cropped (reed canary grass, Phalaris arundinacea) and two were bare without a crop. Waterlogging was conducive to reduction reactions causing a slight rise in pH, a substantial increase in Fe (Fepw) and a decrease in Al (Alpw) in the pore water. The increase in Fepw was decisively higher in the cropped waterlogged lysimeters than in the bare ones, which was attributable to the microbiologically catalysed reductive dissolution of poorly ordered iron oxides and secondary minerals. In contrast to warmer climates, Fepw concentrations remained high throughout the experiment, indicating that the reduction was poised in the iron range, while sulphate was not reduced to sulphide. Therefore, the precipitation of iron sulphide was negligible in the environment with a low pH and abundant with poorly ordered Fe oxides. Increased Fe in pore water counteracts the positive effects of waterlogging, when water is flushed from fields to watercourses, where re-oxidation of Fe causes acidity and oxygen depletion. However, waterlogging prevented further oxidation of sulphidic materials and decreased Alpw to one-tenth of the initial concentrations, and even to one-hundredth of the levels in the low water table lysimeters.
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Affiliation(s)
- Seija Virtanen
- Department of Food and Environmental Sciences, P.O. Box 27, Latokartanonkaari 11, Environmental Soil Science, FI-00014 University of Helsinki, Finland; Finnish Drainage Foundation, Simonkatu 12 B 25, 00100 Helsinki, Finland.
| | - Asko Simojoki
- Department of Food and Environmental Sciences, P.O. Box 27, Latokartanonkaari 11, Environmental Soil Science, FI-00014 University of Helsinki, Finland
| | - Helinä Hartikainen
- Department of Food and Environmental Sciences, P.O. Box 27, Latokartanonkaari 11, Environmental Soil Science, FI-00014 University of Helsinki, Finland
| | - Markku Yli-Halla
- Department of Food and Environmental Sciences, P.O. Box 27, Latokartanonkaari 11, Environmental Soil Science, FI-00014 University of Helsinki, Finland
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