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León Ninin JM, Muehe EM, Kölbl A, Higa Mori A, Nicol A, Gilfedder B, Pausch J, Urbanski L, Lueders T, Planer-Friedrich B. Changes in arsenic mobility and speciation across a 2000-year-old paddy soil chronosequence. Sci Total Environ 2024; 908:168351. [PMID: 37939938 DOI: 10.1016/j.scitotenv.2023.168351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 11/03/2023] [Accepted: 11/03/2023] [Indexed: 11/10/2023]
Abstract
Rice accumulates arsenic (As) when cultivated under flooded conditions in paddy soils threatening rice yield or its safety for human consumption, depending on As speciation. During long-term paddy use, repeated redox cycles systematically alter soil biogeochemistry and microbiology. In the present study, incubation experiments from a 2000-year-old paddy soil chronosequence revealed that As mobilization and speciation also change with paddy soil age. Younger paddies (≤100 years) showed the highest total As mobilization, with speciation dominated by carcinogenic inorganic oxyarsenic species and highly mobile inorganic thioarsenates. Inorganic thioarsenates formed by a high availability of reduced sulfur (S) due to low concentrations of reducible iron (Fe) and soil organic carbon (SOC). Long-term paddy use (>100 years) resulted in higher microbial activity and SOC, increasing the share of phytotoxic methylated As. Methylated oxyarsenic species are precursors for cytotoxic methylated thioarsenates. Methylated thioarsenates formed in soils of all ages being limited either by the availability of methylated As in young soils or that of reduced-S in older ones. The present study shows that via a linkage of As to the biogeochemistry of Fe, S, and C, paddy soil age can influence the kind and the extent of threat that As poses for rice cultivation.
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Affiliation(s)
- José M León Ninin
- Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
| | - E Marie Muehe
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research (UFZ), 04318 Leipzig, Germany; Department of Geosciences, University of Tübingen, 72076 Tübingen, Germany
| | - Angelika Kölbl
- Soil Science and Soil Protection, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
| | - Alejandra Higa Mori
- Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
| | - Alan Nicol
- Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
| | - Ben Gilfedder
- Limnological Research Station, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
| | - Johanna Pausch
- Agroecology, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
| | - Livia Urbanski
- Chair of Soil Science, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Emil-Ramann-Str. 2, 85354 Freising, Germany
| | - Tillmann Lueders
- Ecological Microbiology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, 95448 Bayreuth, Germany
| | - Britta Planer-Friedrich
- Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany.
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Kölbl A, Kaiser K, Winkler P, Mosley L, Fitzpatrick R, Marschner P, Wagner FE, Häusler W, Mikutta R. Transformation of jarosite during simulated remediation of a sandy sulfuric soil. Sci Total Environ 2021; 773:145546. [PMID: 33940732 DOI: 10.1016/j.scitotenv.2021.145546] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/23/2021] [Accepted: 01/27/2021] [Indexed: 05/27/2023]
Abstract
Aeration of wetland soils containing iron (Fe) sulfides can cause strong acidification due to the generation of large amounts of sulfuric acid and formation of Fe oxyhydroxy sulfate phases such as jarosite. Remediation by re-establishment of anoxic conditions promotes jarosite transformation to Fe oxyhydroxides and/or Fe sulfides, but the driving conditions and mechanisms are largely unresolved. We investigated a sandy, jarosite-containing soil (initial pH = 3.0, Eh ~600 mV) in a laboratory incubation experiment under submerged conditions, either with or without wheat straw addition. Additionally, a model soil composed of synthesized jarosite mixed with quartz sand was used. Eh and pH values were monitored weekly. Solution concentrations of total dissolved organic carbon, Fe, S, and K as well as proportions of Fe2+ and SO42- were analysed at the end of the experiment. Sequential Fe extraction, X-ray diffraction, and Mössbauer spectroscopy were used to characterize the mineral composition of the soils. Only when straw was added to natural and artificial sulfuric soils, the pH increased up to 6.5, and Eh decreased to approx. 0 mV. The release of Fe (mainly Fe2+), K, and S (mainly SO42-) into the soil solution indicated redox- and pH-induced dissolution of jarosite. Mineralogical analyses confirmed jarosite losses in both soils. While lepidocrocite formed in the natural sulfuric soil, goethite was formed in the artificial sulfuric soil. Both soils showed also increases in non-sulfidized, probably organically associated Fe2+/Fe3+, but no (re-)formation of Fe sulfides. Unlike Fe sulfides, the formed Fe oxyhydroxides are not prone to support re-acidification in the case of future aeration. Thus, inducing moderately reductive conditions by controlled supply of organic matter could be a promising way for remediation of soils and sediments acidified by oxidation of sulfuric materials.
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Affiliation(s)
- Angelika Kölbl
- Soil Science and Soil Protection, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany.
| | - Klaus Kaiser
- Soil Science and Soil Protection, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
| | - Pauline Winkler
- Soil Science and Soil Protection, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
| | - Luke Mosley
- Acid Sulfate Soils Centre, The University of Adelaide, South Australia 5064, Australia
| | - Rob Fitzpatrick
- Acid Sulfate Soils Centre, The University of Adelaide, South Australia 5064, Australia
| | - Petra Marschner
- School of Agriculture, Food and Wine, The University of Adelaide, South Australia 5005, Australia
| | - Friedrich E Wagner
- Physik Department, Technische Universität München, 85747 Garching, Germany
| | - Werner Häusler
- Lehrstuhl für Bodenkunde, Technische Universität München, 85350 Freising, Germany
| | - Robert Mikutta
- Soil Science and Soil Protection, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
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Pohl L, Kölbl A, Werner F, Mueller CW, Höschen C, Häusler W, Kögel-Knabner I. Imaging of Al/Fe ratios in synthetic Al-goethite revealed by nanoscale secondary ion mass spectrometry. Rapid Commun Mass Spectrom 2018; 32:619-628. [PMID: 29465799 DOI: 10.1002/rcm.8088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 02/09/2018] [Accepted: 02/09/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Aluminium (Al)-substituted goethite is ubiquitous in soils and sediments. The extent of Al-substitution affects the physicochemical properties of the mineral and influences its macroscale properties. Bulk analysis only provides total Al/Fe ratios without providing information with respect to the Al-substitution of single minerals. Here, we demonstrate that nanoscale secondary ion mass spectrometry (NanoSIMS) enables the precise determination of Al-content in single minerals, while simultaneously visualising the variation of the Al/Fe ratio. METHODS Al-substituted goethite samples were synthesized with increasing Al concentrations of 0.1, 3, and 7 % and analysed by NanoSIMS in combination with established bulk spectroscopic methods (XRD, FTIR, Mössbauer spectroscopy). The high spatial resolution (50-150 nm) of NanoSIMS is accompanied by a high number of single-point measurements. We statistically evaluated the Al/Fe ratios derived from NanoSIMS, while maintaining the spatial information and reassigning it to its original localization. RESULTS XRD analyses confirmed increasing concentration of incorporated Al within the goethite structure. Mössbauer spectroscopy revealed 11 % of the goethite samples generated at high Al concentrations consisted of hematite. The NanoSIMS data show that the Al/Fe ratios are in agreement with bulk data derived from total digestion and demonstrated small spatial variability between single-point measurements. More advantageously, statistical analysis and reassignment of single-point measurements allowed us to identify distinct spots with significantly higher or lower Al/Fe ratios. CONCLUSIONS NanoSIMS measurements confirmed the capacity to produce images, which indicated the uniform increase in Al-concentrations in goethite. Using a combination of statistical analysis with information from complementary spectroscopic techniques (XRD, FTIR and Mössbauer spectroscopy) we were further able to reveal spots with lower Al/Fe ratios as hematite.
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Affiliation(s)
- Lydia Pohl
- Lehrstuhl für Bodenkunde, Technische Universität München, 85354, Freising, Germany
| | - Angelika Kölbl
- Lehrstuhl für Bodenkunde, Technische Universität München, 85354, Freising, Germany
| | - Florian Werner
- Lehrstuhl für Bodenkunde, Technische Universität München, 85354, Freising, Germany
| | - Carsten W Mueller
- Lehrstuhl für Bodenkunde, Technische Universität München, 85354, Freising, Germany
| | - Carmen Höschen
- Lehrstuhl für Bodenkunde, Technische Universität München, 85354, Freising, Germany
| | - Werner Häusler
- Lehrstuhl für Bodenkunde, Technische Universität München, 85354, Freising, Germany
| | - Ingrid Kögel-Knabner
- Lehrstuhl für Bodenkunde, Technische Universität München, 85354, Freising, Germany
- Institute for Advanced Study, Technische Universität München, 85748, Garching, Germany
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Steffens M, Rogge DM, Mueller CW, Höschen C, Lugmeier J, Kölbl A, Kögel-Knabner I. Identification of Distinct Functional Microstructural Domains Controlling C Storage in Soil. Environ Sci Technol 2017; 51:12182-12189. [PMID: 28954517 DOI: 10.1021/acs.est.7b03715] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The physical, chemical, and biological processes forming the backbone of important soil functions (e.g., carbon sequestration, nutrient and contaminant storage, and water transport) take place at reactive interfaces of soil particles and pores. The accessibility of these interfaces is determined by the spatial arrangement of the solid mineral and organic soil components, and the resulting pore system. Despite the development and application of novel imaging techniques operating at the micrometer and even nanometer scale, the microstructure of soils is still considered as a random arrangement of mineral and organic components. Using nanoscale secondary ion mass spectroscopy (NanoSIMS) and a novel digital image processing routine adapted from remote sensing (consisting of image preprocessing, endmember extraction, and a supervised classification), we extensively analyzed the spatial distribution of secondary ions that are characteristic of mineral and organic soil components on the submicrometer scale in an intact soil aggregate (40 measurements, each covering an area of 30 μm × 30 μm with a lateral resolution of 100 nm × 100 nm). We were surprised that the 40 spatially independent measurements clustered in just two complementary types of micrometer-sized domains. Each domain is characterized by a microarchitecture built of a definite mineral assemblage with various organic matter forms and a specific pore system, each fulfilling different functions in soil. Our results demonstrate that these microarchitectures form due to self-organization of the manifold mineral and organic soil components to distinct mineral assemblages, which are in turn stabilized by biophysical feedback mechanisms acting through pore characteristics and microbial accessibility. These microdomains are the smallest units in soil that fulfill specific functionalities.
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Affiliation(s)
- Markus Steffens
- Lehrstuhl für Bodenkunde, Wissenschaftszentrum Weihenstephan, Technische Universität München , Emil-Ramann-Straße 2, D-85354 Freising, Germany
- Department of Soil Sciences, Research Institute of Organic Agriculture (FiBL) , Ackerstrasse 113, CH-5070 Frick, Switzerland
| | - Derek M Rogge
- Applied Spectroscopy Group, Deutsche Forschungsanstalt für Luft- und Raumfahrt Oberpfaffenhofen , D-82234 Wessling, Germany
| | - Carsten W Mueller
- Lehrstuhl für Bodenkunde, Wissenschaftszentrum Weihenstephan, Technische Universität München , Emil-Ramann-Straße 2, D-85354 Freising, Germany
| | - Carmen Höschen
- Lehrstuhl für Bodenkunde, Wissenschaftszentrum Weihenstephan, Technische Universität München , Emil-Ramann-Straße 2, D-85354 Freising, Germany
| | - Johann Lugmeier
- Lehrstuhl für Bodenkunde, Wissenschaftszentrum Weihenstephan, Technische Universität München , Emil-Ramann-Straße 2, D-85354 Freising, Germany
| | - Angelika Kölbl
- Lehrstuhl für Bodenkunde, Wissenschaftszentrum Weihenstephan, Technische Universität München , Emil-Ramann-Straße 2, D-85354 Freising, Germany
| | - Ingrid Kögel-Knabner
- Lehrstuhl für Bodenkunde, Wissenschaftszentrum Weihenstephan, Technische Universität München , Emil-Ramann-Straße 2, D-85354 Freising, Germany
- Institute of Advanced Study, Technische Universität München , Lichtenbergstraße 2a, D-85748 Garching, Germany
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Schulz S, Kölbl A, Ebli M, Buegger F, Schloter M, Fiedler S. Field-Scale Pattern of Denitrifying Microorganisms and N 2O Emission Rates Indicate a High Potential for Complete Denitrification in an Agriculturally Used Organic Soil. Microb Ecol 2017; 74:765-770. [PMID: 28492990 DOI: 10.1007/s00248-017-0991-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 04/27/2017] [Indexed: 06/07/2023]
Abstract
More than 50% of all anthropogenic N2O emissions come from the soil. Drained Histosols that are used for agricultural purposes are particularly potent sources of denitrification due to higher stocks of organic matter and fertiliser application. However, conditions that favour denitrification can vary considerably across a field and change significantly throughout the year. Spatial and temporal denitrifier dynamics were assessed in a drained, intensely managed Histosol by focusing on the genetic nitrite and N2O reduction potential derived from the abundance of nirK, nirS and nosZ genes. These data were correlated with soil properties at two different points in time in 2013. N2O emissions were measured every 2 weeks over three vegetation periods (2012-2014). Very low N2O emission rates were measured throughout the entire period of investigation in accordance with the geostatistical data that revealed an abundance of microbes carrying the N2O reductase gene nosZ. This, along with neutral soil pH values, is indicative of high microbial denitrification potential. While the distribution of the microbial communities was strongly influenced by total organic carbon and nitrogen pools in March, the spatial distribution pattern was not related to the distribution of soil properties in October, when higher nutrient availability was observed. Different nitrite reducer groups prevailed in spring and autumn. While nirS, followed by nosZ and nirK, was most abundant in March, the latter was the dominant nitrite reductase in October.
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Affiliation(s)
- Stefanie Schulz
- Research Unit Comparative Microbiome Analysis, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Angelika Kölbl
- Department of Ecology and Ecosystem Management, Technical University of Munich, Emil-Ramann-Straße 2, 85354, Freising, Germany
| | - Martin Ebli
- Institute for Geography, Soil Science, Johannes Gutenberg-University Mainz, Johann-Joachim-Becher-Weg 21, 55099, Mainz, Germany
| | - Franz Buegger
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Michael Schloter
- Research Unit Comparative Microbiome Analysis, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Sabine Fiedler
- Institute for Geography, Soil Science, Johannes Gutenberg-University Mainz, Johann-Joachim-Becher-Weg 21, 55099, Mainz, Germany.
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Andergassen U, Kölbl A, Jeschke U, Mahner S. Signaltransduktion als neue therapeutische Option beim triple-negativen Mammakarzinom. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- U Andergassen
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, LMU München, Campus Innenstadt, München
| | - A Kölbl
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, LMU München, Campus Innenstadt, München
| | - U Jeschke
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, LMU München, Campus Innenstadt, München
| | - S Mahner
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, LMU München, Campus Innenstadt, München
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Mumm JN, Kölbl A, Mahner S, Jeschke U, Andergassen U. Triple-negatives Mammakarzinom: Signaltransduktionskaskaden als neue therapeutische Option. Geburtshilfe Frauenheilkd 2016. [DOI: 10.1055/s-0036-1593034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Birk A, Victor LM, Kölbl A, Mahner S, Jeschke U, Andergassen U. Die Rolle von VEGFR und LHCGR beim endometrialen Adenokarzinom. Geburtshilfe Frauenheilkd 2016. [DOI: 10.1055/s-0036-1593033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Hörl M, Victor LM, Birk A, Kölbl A, Mahner S, Jeschke U, Andergassen U. CTCs beim endometroiden Adenokarzinom: Markergene für die Real-Time PCR. Geburtshilfe Frauenheilkd 2016. [DOI: 10.1055/s-0036-1593032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Stempfhuber B, Richter-Heitmann T, Regan KM, Kölbl A, Wüst PK, Marhan S, Sikorski J, Overmann J, Friedrich MW, Kandeler E, Schloter M. Spatial Interaction of Archaeal Ammonia-Oxidizers and Nitrite-Oxidizing Bacteria in an Unfertilized Grassland Soil. Front Microbiol 2016; 6:1567. [PMID: 26834718 PMCID: PMC4722141 DOI: 10.3389/fmicb.2015.01567] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 12/27/2015] [Indexed: 12/18/2022] Open
Abstract
Interrelated successive transformation steps of nitrification are performed by distinct microbial groups - the ammonia-oxidizers, comprising ammonia-oxidizing archaea (AOA) and bacteria (AOB), and nitrite-oxidizers such as Nitrobacter and Nitrospira, which are the dominant genera in the investigated soils. Hence, not only their presence and activity in the investigated habitat is required for nitrification, but also their temporal and spatial interactions. To demonstrate the interdependence of both groups and to address factors promoting putative niche differentiation within each group, temporal and spatial changes in nitrifying organisms were monitored in an unfertilized grassland site over an entire vegetation period at the plot scale of 10 m(2). Nitrifying organisms were assessed by measuring the abundance of marker genes (amoA for AOA and AOB, nxrA for Nitrobacter, 16S rRNA gene for Nitrospira) selected for the respective sub-processes. A positive correlation between numerically dominant AOA and Nitrospira, and their co-occurrence at the same spatial scale in August and October, suggests that the nitrification process is predominantly performed by these groups and is restricted to a limited timeframe. Amongst nitrite-oxidizers, niche differentiation was evident in observed seasonally varying patterns of co-occurrence and spatial separation. While their distributions were most likely driven by substrate concentrations, oxygen availability may also have played a role under substrate-limited conditions. Phylogenetic analysis revealed temporal shifts in Nitrospira community composition with an increasing relative abundance of OTU03 assigned to sublineage V from August onward, indicating its important role in nitrite oxidation.
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Affiliation(s)
- Barbara Stempfhuber
- Environmental Genomics, Helmholtz Zentrum München, German Research Centre for Environmental Health Neuherberg, Germany
| | | | - Kathleen M Regan
- Institute of Soil Science and Land Evaluation, University of Hohenheim Stuttgart-Hohenheim, Germany
| | - Angelika Kölbl
- Lehrstuhl für Bodenkunde, Technische Universität München Freising, Germany
| | - Pia K Wüst
- Leibniz-Institute DSMZ, German Collection of Microorganisms and Cell Cultures Braunschweig, Germany
| | - Sven Marhan
- Institute of Soil Science and Land Evaluation, University of Hohenheim Stuttgart-Hohenheim, Germany
| | - Johannes Sikorski
- Leibniz-Institute DSMZ, German Collection of Microorganisms and Cell Cultures Braunschweig, Germany
| | - Jörg Overmann
- Leibniz-Institute DSMZ, German Collection of Microorganisms and Cell Cultures Braunschweig, Germany
| | | | - Ellen Kandeler
- Institute of Soil Science and Land Evaluation, University of Hohenheim Stuttgart-Hohenheim, Germany
| | - Michael Schloter
- Environmental Genomics, Helmholtz Zentrum München, German Research Centre for Environmental Health Neuherberg, Germany
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Victor LM, Friederike L, Kölbl A, Jeschke U, Andergassen U. Glycosltransferasen als Marker der frühen Phasen der Tumorentstehung. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1555071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Birk A, Liesche F, Kölbl A, Jeschke U, Andergassen U. Die Rolle der N-Acetylgalactosaminyltransferase 6 (GALNT6) in der frühen Phase der Brustkrebsentstehung und der Metastasierung. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1555070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Andergassen U, Liesche F, Kölbl A, Jeschke U, Friese K. Glycosoltransferasen als Marker der frühen Phasen der Tumorentstehung. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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14
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Kölbl A, Liesche F, Jeschke U, Friese K, Andergassen U. Die Rolle der N-acetylgalactosaminyltransferase 6 (GALNT6) in der frühen Phase der Brustkrebsentstehung und der Metastasierung. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Kalbitz K, Kaiser K, Fiedler S, Kölbl A, Amelung W, Bräuer T, Cao Z, Don A, Grootes P, Jahn R, Schwark L, Vogelsang V, Wissing L, Kögel-Knabner I. The carbon count of 2000 years of rice cultivation. Glob Chang Biol 2013; 19:1107-1113. [PMID: 23504888 DOI: 10.1111/gcb.12080] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 10/17/2012] [Indexed: 06/01/2023]
Abstract
More than 50% of the world's population feeds on rice. Soils used for rice production are mostly managed under submerged conditions (paddy soils). This management, which favors carbon sequestration, potentially decouples surface from subsurface carbon cycling. The objective of this study was to elucidate the long-term rates of carbon accrual in surface and subsurface soil horizons relative to those of soils under nonpaddy management. We assessed changes in total soil organic as well as of inorganic carbon stocks along a 2000-year chronosequence of soils under paddy and adjacent nonpaddy management in the Yangtze delta, China. The initial organic carbon accumulation phase lasts much longer and is more intensive than previously assumed, e.g., by the Intergovernmental Panel on Climate Change (IPCC). Paddy topsoils accumulated 170-178 kg organic carbon ha(-1) a(-1) in the first 300 years; subsoils lost 29-84 kg organic carbon ha(-1) a(-1) during this period of time. Subsoil carbon losses were largest during the first 50 years after land embankment and again large beyond 700 years of cultivation, due to inorganic carbonate weathering and the lack of organic carbon replenishment. Carbon losses in subsoils may therefore offset soil carbon gains or losses in the surface soils. We strongly recommend including subsoils into global carbon accounting schemes, particularly for paddy fields.
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Affiliation(s)
- Karsten Kalbitz
- Institute for Biodiversity and Ecosystem Dynamics, Universiteit van Amsterdam, Amsterdam, The Netherlands.
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Andergassen U, Kölbl A, Zebisch M, Neugebauer J, Jäger B, Hutter S, Rack B, Schindlbeck C, Friese K, Jeschke U. 278 Two Methods for the Detection of Breast Cancer Cells in Blood Samples. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)70345-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hecht KJ, Kölbl A, Kraut M, Schubert K. Micromixer Characterization with Competitive-Consecutive Bromination of 1,3,5-Trimethoxybenzene. Chem Eng Technol 2008. [DOI: 10.1002/ceat.200800213] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Pfeifer P, Kölbl A, Schubert K. Kinetic investigations on methanol steam reforming on PdZn catalysts in microchannel reactors and model transfer into the pressure gap region. Catal Today 2005. [DOI: 10.1016/j.cattod.2005.09.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Kölbl A, Pfeifer P, Kraut M, Schubert K, Emig G, Liauw MA, Fichtner M. Untersuchung des externen Stofftransports in einem Mikrostrukturreaktor durch Druckvariation. CHEM-ING-TECH 2004. [DOI: 10.1002/cite.200407018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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22
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Kölbl A, Pfeifer P, Fichtner M, Kraut M, Schubert K, Liauw M, Emig G. Examination of External Mass Transport in a Microchannel Reactor by Pressure Variation. Chem Eng Technol 2004. [DOI: 10.1002/ceat.200401962] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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