21 results on '"Preusser, Sebastian"'
Search Results
2. Differences in organic matter properties and microbial activity between bulk and rhizosphere soil from the top- and subsoils of three forest stands
- Author
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Herre, Michael, Heitkötter, Julian, Heinze, Stefanie, Rethemeyer, Janet, Preusser, Sebastian, Kandeler, Ellen, and Marschner, Bernd
- Published
- 2022
- Full Text
- View/download PDF
3. Root exudation of mature beech forests across a nutrient availability gradient : the role of root morphology and fungal activity
- Author
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Meier, Ina C., Tückmantel, Timo, Heitkötter, Julian, Müller, Karolin, Preusser, Sebastian, Wrobel, Thomas J., Kandeler, Ellen, Marschner, Bernd, and Leuschner, Christoph
- Published
- 2020
4. Factors controlling the variability of organic matter in the top- and subsoil of a sandy Dystric Cambisol under beech forest
- Author
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Heinze, Stefanie, Ludwig, Bernard, Piepho, Hans-Peter, Mikutta, Robert, Don, Axel, Wordell-Dietrich, Patrick, Helfrich, Mirjam, Hertel, Dietrich, Leuschner, Christoph, Kirfel, Kristina, Kandeler, Ellen, Preusser, Sebastian, Guggenberger, Georg, Leinemann, Timo, and Marschner, Bernd
- Published
- 2018
- Full Text
- View/download PDF
5. Biogeochemical limitations of carbon stabilization in forest subsoils
- Author
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Liebmann, Patrick, Mikutta, Robert, Kalbitz, Karsten, Wordell‐Dietrich, Patrick, Leinemann, Timo, Preusser, Sebastian, Mewes, Ole, Perrin, Eike, Bachmann, Jörg, Don, Axel, Kandeler, Ellen, Marschner, Bernd, Schaarschmidt, Frank, Guggenberger, Georg, Liebmann, Patrick, Mikutta, Robert, Kalbitz, Karsten, Wordell‐Dietrich, Patrick, Leinemann, Timo, Preusser, Sebastian, Mewes, Ole, Perrin, Eike, Bachmann, Jörg, Don, Axel, Kandeler, Ellen, Marschner, Bernd, Schaarschmidt, Frank, and Guggenberger, Georg
- Abstract
Background: Soils are important carbon (C) sinks or sources and thus of utmost importance for global carbon cycling. Particularly, subsoils are considered to have a high potential for additional C storage due to mineral surfaces still available for sorptive stabilization. Aims: Little information exists about the extent to which additional litter-derived C is transferred to and stabilized in subsoils. This study aimed at evaluating the role of litter-derived dissolved organic matter (DOM) inputs for the formation of stable mineral-associated C in subsoils. Methods: We carried out a multiple-method approach including field labeling with 13C-enriched litter, exposure of 13C-loaded reactive minerals to top- and subsoils, and laboratory sorption experiments. Results: For temperate forest soils, we found that the laboratory-based C sink capacity of subsoils is unlikely to be reached under field conditions. Surface C inputs via litter leachates are little conducive to the subsoil C pool. Only 0.5% of litter-derived C entered the subsoil as DOM within nearly 2 years and most of the recently sorbed C is prone to fast microbial mineralization rather than long-term mineral retention. Desorption to the soil solution and an adapted microbial community re-mobilize organic matter in subsoils faster than considered so far. Conclusions: We conclude that the factors controlling the current mineral retention and stabilization of C within temperate forest subsoils will likewise limit additional C uptake. Thus, in contrast to their widely debated potential to accrue more C, the role of forest subsoils as future C sink is likely overestimated and needs further reconsideration.
- Published
- 2022
6. Biogeochemical limitations of carbon stabilization in forest subsoils #
- Author
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Liebmann, Patrick, primary, Mikutta, Robert, additional, Kalbitz, Karsten, additional, Wordell‐Dietrich, Patrick, additional, Leinemann, Timo, additional, Preusser, Sebastian, additional, Mewes, Ole, additional, Perrin, Eike, additional, Bachmann, Jörg, additional, Don, Axel, additional, Kandeler, Ellen, additional, Marschner, Bernd, additional, Schaarschmidt, Frank, additional, and Guggenberger, Georg, additional
- Published
- 2021
- Full Text
- View/download PDF
7. Soil texture affects the coupling of litter decomposition and soil organic matter formation
- Author
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Angst, Gerrit, primary, Pokorný, Jan, additional, Mueller, Carsten W., additional, Prater, Isabel, additional, Preusser, Sebastian, additional, Kandeler, Ellen, additional, Meador, Travis, additional, Straková, Petra, additional, Hájek, Tomáš, additional, van Buiten, Gerard, additional, and Angst, Šárka, additional
- Published
- 2021
- Full Text
- View/download PDF
8. Microbial Utilisation of Aboveground Litter-Derived Organic Carbon Within a Sandy Dystric Cambisol Profile
- Author
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Preusser, Sebastian, primary, Liebmann, Patrick, additional, Stucke, Andres, additional, Wirsching, Johannes, additional, Müller, Karolin, additional, Mikutta, Robert, additional, Guggenberger, Georg, additional, Don, Axel, additional, Kalbitz, Karsten, additional, Bachmann, Jörg, additional, Marhan, Sven, additional, Poll, Christian, additional, and Kandeler, Ellen, additional
- Published
- 2021
- Full Text
- View/download PDF
9. Soil texture affects the coupling of litter decomposition and soil organic matter formation
- Author
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Angst, Gerrit, Pokorný, Jan, Mueller, Carsten W., Prater, Isabel, Preusser, Sebastian, Kandeler, Ellen, Meador, Travis, Straková, Petra, Hájek, Tomáš, van Buiten, Gerard, Angst, Šárka, Angst, Gerrit, Pokorný, Jan, Mueller, Carsten W., Prater, Isabel, Preusser, Sebastian, Kandeler, Ellen, Meador, Travis, Straková, Petra, Hájek, Tomáš, van Buiten, Gerard, and Angst, Šárka
- Abstract
Incomplete knowledge on the environmental factors linking litter decomposition and the formation of soil organic matter (SOM) hampers the sustainable management of soil as a carbon (C) sink. Here, we explored the effect of soil texture on the fate of C from decomposing litter (Indiangrass; Sorghastrum nutans (L.) Nash) and the concurrent formation of SOM in mineral soils of different textures (sand- and clay-rich) and forest floor material. We quantified the amount of litter C respired, C remaining in the litter, and litter C retained in the soil/forest floor in a 186-day incubation employing stable isotope analyses (13C). We complemented our isotopic approach with the extraction of microbial biomarkers from the litter and soils/forest floor material and spectroscopic studies into the compositional changes of the incubated materials. We found that soil texture affected both the decomposition of litter and the retention of litter-derived C in the soil. The soil rich in clay provided conditions favorable for a more efficient microbial utilization of the litter material (high pH and high C use efficiency) as compared to the sand-rich soil and the forest floor. This resulted in lower amounts of litter C respired as CO2 (25.0%, vs. 55.6 and 56.1% in clay vs. sand and forest floor material, respectively) and higher amounts of litter C retained in the clay-rich soil (12.6% vs. 3.5 and 5.3% in clay vs. sand and forest floor material, respectively). High contents of silt- and clay-sized mineral particles in the clay-rich soil likely resulted in the ability to stabilize litter C in aggregates and organo-mineral associations, perhaps as microbial residues. This ability was low in the sand-rich soil and virtually absent in the forest floor, where the recalcitrance of the litter and native SOM was probably more relevant, and a larger portion of litter C may have been retained in the soil as relatively untransformed plant compounds. We emphasize that litt
- Published
- 2021
10. Additional carbon stabilization in temperate subsoils impeded by biogeochemical and hydraulic constraints
- Author
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Guggenberger, Georg, primary, Liebmann, Patrick, additional, Mikutta, Robert, additional, Kalbitz, Karsten, additional, Wordell-Dietrich, Patrick, additional, Leinemann, Timo, additional, Preusser, Sebastian, additional, Bachmann, Jörg, additional, Don, Axel, additional, Kandeler, Ellen, additional, Marschner, Bernd, additional, and Schaarschmidt, Frank, additional
- Published
- 2021
- Full Text
- View/download PDF
11. Biogeochemical limitations of carbon stabilization in forest subsoils#.
- Author
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Liebmann, Patrick, Mikutta, Robert, Kalbitz, Karsten, Wordell‐Dietrich, Patrick, Leinemann, Timo, Preusser, Sebastian, Mewes, Ole, Perrin, Eike, Bachmann, Jörg, Don, Axel, Kandeler, Ellen, Marschner, Bernd, Schaarschmidt, Frank, and Guggenberger, Georg
- Subjects
SUBSOILS ,DISSOLVED organic matter ,CARBON cycle ,SOIL solutions ,TEMPERATE forests ,FOREST soils - Abstract
Background: Soils are important carbon (C) sinks or sources and thus of utmost importance for global carbon cycling. Particularly, subsoils are considered to have a high potential for additional C storage due to mineral surfaces still available for sorptive stabilization. Aims: Little information exists about the extent to which additional litter‐derived C is transferred to and stabilized in subsoils. This study aimed at evaluating the role of litter‐derived dissolved organic matter (DOM) inputs for the formation of stable mineral‐associated C in subsoils. Methods: We carried out a multiple‐method approach including field labeling with 13C‐enriched litter, exposure of 13C‐loaded reactive minerals to top‐ and subsoils, and laboratory sorption experiments. Results: For temperate forest soils, we found that the laboratory‐based C sink capacity of subsoils is unlikely to be reached under field conditions. Surface C inputs via litter leachates are little conducive to the subsoil C pool. Only 0.5% of litter‐derived C entered the subsoil as DOM within nearly 2 years and most of the recently sorbed C is prone to fast microbial mineralization rather than long‐term mineral retention. Desorption to the soil solution and an adapted microbial community re‐mobilize organic matter in subsoils faster than considered so far. Conclusions: We conclude that the factors controlling the current mineral retention and stabilization of C within temperate forest subsoils will likewise limit additional C uptake. Thus, in contrast to their widely debated potential to accrue more C, the role of forest subsoils as future C sink is likely overestimated and needs further reconsideration. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
12. Dynamic exchange and remobilization processes as controls of soil organic carbon turnover
- Author
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Guggenberger, Georg, primary, Liebmann, Patrick, additional, Wordell-Dietrich, Patrick, additional, Preußer, Sebastian, additional, Kalks, Fabian, additional, Leinemann, Timo, additional, Cerli, Chiara, additional, Kandeler, Ellen, additional, Don, Axel, additional, Mikutta, Robert, additional, and Kalbitz, Karsten, additional
- Published
- 2020
- Full Text
- View/download PDF
13. Biological regulation of subsoil C-cycling
- Author
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Preußer, Sebastian
- Subjects
Kohlenstoffkreislauf ,Bacteria ,Kohlenstoff ,Unterboden ,Microorganisms ,Fungi ,Agriculture ,Umweltfaktoren ,Bodenprofil ,Carbon ,Bakterien ,Subsoil ,Mikroklima ,Pilze ,ddc:630 ,Mikroorganismengemeinschaft - Abstract
Soils are the largest terrestrial reservoir of organic carbon (OC). Substantial proportions of the stored OC are found in stabilized form in deeper soil layers. Beside the quality and quantity of C input from plant biomass, C storage in soil is primarily controlled by the microbial decomposition capacity. Various physical, chemical and biological factors (e.g., substrate availability, temperature, water content, pH, texture) vary within soil profiles and directly or indirectly influence the abundance, composition and activity of microbial communities and thus the microbial C turnover. While soil microbiological research has so far focused mainly on processes in topsoil, the mechanisms of C storage and turnover in subsoil are largely unknown. The objective of the present thesis was therefore to investigate the specific influence of substrate availability and different environmental factors as well as their interactions on microbial communities and their regulatory function in subsoil C-cycling. This objective was addressed in three studies. In the first and second study, one-year field experiments were established in which microbial communities from different soil depths were exposed to altered habitat conditions to identify crucial factors influencing the spatial and temporal development of microbial abundance and substrate utilization within soil profiles. This was achieved by reciprocal translocation of soils between subsoil horizons (first study) and topsoil and subsoil horizons (second study) in combination with addition of 13C-labelled substrates and different sampling dates. In the third study, a flow cascade experiment with soil columns from topsoil and subsoil horizons and soil minerals (goethite) coated with 13C-labelled organic matter (OM) was established. This laboratory experiment investigated the importance of exchange processes of OM with reactive soil minerals for the quality and quantity of dissolved OM and the influence of these soil micro-habitats on microbial abundance and community composition with increasing soil depth. In the first study, the reciprocal translocation of subsoils from different soil depths revealed that due to comparable micro-climatic conditions and soil textures within the subsoil profile, no changes in microbial biomass, community composition and activity occurred. Moreover, increasing microbial substrate utilization in relation to the quantity of added substrate indicated that deep soil layers exhibit high potential for microbial C turnover. However, this potential was constrained by low soil moisture in interplay with the coarse soil texture and the resulting micro-scale fragmentation of the subsoil environment. The bacterial substrate utilization was more affected by this spatial separation between microorganisms and potentially available substrate than that of fungi, which was further confirmed by the translocation experiment with topsoil and subsoil in the second study. While the absolute substrate utilization capacity of bacteria decreased from the more moist topsoil to the drier subsoil, fungi were able to increase their substrate utilization and thus to partially compensate the decrease in C input from other sources. Furthermore, the addition of root litter as a preferential C source of fungal decomposer communities led to a pronounced fungal growth in subsoil. The third study demonstrated the high importance of reactive soil minerals both in topsoil and in subsoil for microbial growth due to extensive exchange processes of OM and the associated high availability of labile C. In particular copiotrophic bacteria such as Betaproteobacteria benefited from the increased C availability under non-limiting water conditions leading to a pronounced increase in bacterial dominance in the microbial communities of these soil micro-habitats. In conclusion, this thesis showed that subsoil exhibits great potential for both bacterial and fungal C turnover, albeit this potential is limited by various factors. This thesis, however, allowed to determine the specific effects of these factors on bacteria and fungi and their function in subsoil C-cycling and thus to identify those factors of critical importance. The micro-climate in subsoil, in particular soil moisture, was the primary factor limiting bacterial growth and activity, whereas fungi were more strongly restricted by substrate limitations. Böden sind der größte terrestrische Speicher von organischem Kohlenstoff (OC). Ein erheblicher Anteil des gespeicherten OC liegt hierbei in tieferen Bodenschichten in stabilisierter Form vor. Neben der Qualität und Quantität des Eintrages aus pflanzlicher Biomasse wird die C-Speicherung in Böden hauptsächlich durch die mikrobielle Abbauleistung gesteuert. Eine Vielzahl von physikalischen, chemischen und biologischen Faktoren (z.B. Substratverfügbarkeit, Temperatur, Wassergehalt, pH, Textur) variieren innerhalb von Bodenprofilen und beeinflussen direkt oder indirekt die Abundanz, Zusammensetzung und Aktivität mikrobieller Gemeinschaften und somit den mikrobiellen C-Umsatz. Während die bodenmikrobiologische Forschung bisher verstärkt auf Prozesse im Oberboden ausgerichtet war, sind die Mechanismen der Speicherung und des Umsatzes von C im Unterboden weitgehend unbekannt. Das Ziel der vorliegenden Arbeit war es daher, den spezifischen Einfluss von Substratverfügbarkeit und verschiedener Umweltfaktoren sowie ihrer Wechselwirkungen auf die mikrobielle Gemeinschaft und ihre regulierende Funktion im C-Kreislauf des Unterbodens zu untersuchen. Dieses Ziel wurde durch drei Studien angegangen. In der ersten und zweiten Studie wurden jeweils einjährige Feldexperimente etabliert, in denen Mikroorganismengemeinschaften verschiedener Bodentiefen veränderten Habitatbedingungen ausgesetzt wurden, um entscheidende Einflussgrößen auf die räumliche und zeitliche Entwicklung ihrer Abundanz und Substratnutzung innerhalb von Bodenprofilen zu identifizieren. Dies wurde durch eine wechselseitige Translokation von Böden zwischen Unterbodenhorizonten (erste Studie) und Oberboden- und Unterbodenhorizonten (zweite Studie) in Kombination mit Zugabe von 13C-markierten Substraten und mehreren Probennahmezeitpunkten möglich. In der dritten Studie wurde ein Fluss-Kaskaden-Experiment mit Bodensäulen aus Ober- und Unterbodenhorizonten und mit 13C-markiertem organischen Material (OM) belegten Bodenmineralen (Goethit) etabliert. Mit diesem Laborexperiment wurde die Bedeutung von Austauschprozessen von OM mit reaktiven Bodenmineralen für die Qualität und Quantität von gelöstem OM sowie der Einfluss dieser Boden-Mikrohabitate auf die mikrobielle Abundanz und Gemeinschaftszusammensetzung mit zunehmender Bodentiefe untersucht. Durch die wechselseitige Translokation von Unterböden verschiedener Ursprungstiefen in der ersten Studie zeigte sich, dass aufgrund vergleichbarer mikroklimatischer Bedingungen und Bodentexturen innerhalb des Unterbodenprofils keine Veränderungen der mikrobiellen Biomasse, Gemeinschaftszusammensetzung und Aktivität auftraten. Die in Abhängigkeit von der Zugabemenge gesteigerte mikrobielle Substratnutzung verdeutlichte darüber hinaus, dass in tieferen Bodenschichten ein hohes Potential zum mikrobiellen C-Umsatz besteht. Dieses wurde jedoch durch die geringe Bodenfeuchtigkeit im Zusammenspiel mit der groben Bodentextur und einer daraus resultierenden kleinräumigen Fragmentierung im Unterboden stark eingeschränkt. Die bakterielle Substratnutzung war durch diese räumliche Trennung von Mikroorganismen und potentiell verfügbarem Substrat stärker betroffen als die pilzliche, was sich im Translokationsexperiment mit Ober- und Unterböden der zweiten Studie bestätigte. Während die absolute Substratnutzungskapazität der Bakterien vom feuchteren Oberboden zum trockeneren Unterboden abnahm, konnten Pilze diese steigern und somit die Abnahme des C-Eintrages aus anderen Quellen teilweise ausgleichen. Des Weiteren führte die Wurzelstreu-Zugabe als präferentielle C-Quelle pilzlicher Zersetzergemeinschaften zu einem deutlichen Pilzwachstum im Unterboden. Die dritte Studie verdeutlichte, dass reaktive Minerale sowohl im Oberboden als auch im Unterboden aufgrund ausgeprägter Austauschprozesse von OM und einer damit einhergehenden hohen Verfügbarkeit von labilem C von großer Bedeutung für mikrobielles Wachstum sind. Insbesondere profitierten kopiotrophe Bakterien wie Betaproteobacteria unter den nicht wasserlimitierten Bedingungen von der gesteigerten C-Verfügbarkeit, was zu einer deutlichen Steigerung der bakteriellen Dominanz in der mikrobiellen Gemeinschaft dieser Boden-Mikrohabitate führte. Zusammenfassend wurde durch diese Arbeit deutlich, dass in Unterböden ein großes Potential sowohl zu bakteriellem als auch pilzlichem C-Umsatz vorhanden ist. Dieses Potential wird jedoch durch verschiedene Faktoren begrenzt. Es war durch diese Arbeit indes möglich, die spezifische Wirkung dieser Faktoren auf Bakterien und Pilze und ihre Funktion im C-Kreislauf des Unterbodens aufzuzeigen und somit jene von entscheidender Bedeutung zu identifizieren. So war das Mikroklima im Unterboden, insbesondere Bodenfeuchte, der primär limitierende Faktor bakteriellen Wachstums und Aktivität, wohingegen pilzliches Wachstum stärker durch Substratlimitierungen begrenzt wurde.
- Published
- 2019
14. Which are important soil parameters influencing the spatial heterogeneity of 14C in soil organic matter?
- Author
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John, Stephan, Angst, Gerrit, Kirfel, Kristina, Preusser, Sebastian, Mueller, Carsten W., Leuschner, Christoph, Kandeler, Ellen, and Rethemeyer, Janet
- Abstract
Radiocarbon (14C) analysis is an important tool that can provide information on the dynamics of organic matter in soils. Radiocarbon concentrations of soil organic matter (SOM) however, reflect the heterogeneous mixture of various organic compounds and are affected by different chemical, biological, and physical soil parameters. These parameters can vary strongly in soil profiles and thus affect the spatial distribution of the apparent 14C age of SOM considerably. The heterogeneity of SOM and its 14C signature may be even larger in subsoil horizons, which are thought to receive organic carbon inputs following preferential pathways. This will bias conclusions drawn from 14C analyses of individual soil profiles considerably. We thus investigated important soil parameters, which may influence the 14C distribution of SOM as well as the spatial heterogeneity of 14C distributions in soil profiles. The suspected strong heterogeneity and spatial variability, respectively of bulk SOM is confirmed by the variable 14C distribution in three 185 cm deep profiles in a Dystric Cambisol. The 14C contents are most variable in the C horizons because of large differences in the abundance of roots there. The distribution of root biomass and necromass and its organic carbon input is the most important factor affecting the 14C distribution of bulk SOM. The distance of the soil profiles to a beech did not influence the horizontal and vertical distribution of roots and 14C concentrations. Other parameters were found to be of minor importance including microbial biomass-derived carbon and soil texture. The microbial biomass however, may promote a faster turnover of SOM at hot spots resulting in lower 14C concentration there. Soil texture had no statistically significant influence on the spatial 14C distribution of bulk SOM. However, SOM in fine silt and clay sized particles (< 6.3 µm) yields slightly higher 14C concentrations than bulk SOM particularly at greater soil depth, which is in contrast to previous studies where silt and clay fractions contained older SOM stabilized by organo-mineral interaction. 14C contents of fine silt and clay correlate with the microbial biomass-derived carbon suggesting a considerable contribution of microbial-derived organic carbon. In conclusion, 14C analyses of bulk SOM mainly reflect the spatial distribution of roots, which is strongly variable even on a small spatial scale of few meters. This finding should be considered when using 14C analysis to determine SOM.
- Published
- 2018
15. Fungi and bacteria respond differently to changing environmental conditions within a soil profile
- Author
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Preusser, Sebastian, primary, Poll, Christian, additional, Marhan, Sven, additional, Angst, Gerrit, additional, Mueller, Carsten W., additional, Bachmann, Jörg, additional, and Kandeler, Ellen, additional
- Published
- 2019
- Full Text
- View/download PDF
16. Reciprocal soil transfer experiments improve the understanding of biological regulation of subsoil c-cycling
- Author
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Preusser, Sebastian
- Published
- 2016
- Full Text
- View/download PDF
17. Root exudation patterns in a beech forest: Dependence on soil depth, root morphology, and environment
- Author
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Tückmantel, Timo, primary, Leuschner, Christoph, additional, Preusser, Sebastian, additional, Kandeler, Ellen, additional, Angst, Gerrit, additional, Mueller, Carsten W., additional, and Meier, Ina Christin, additional
- Published
- 2017
- Full Text
- View/download PDF
18. Microbial community response to changes in substrate availability and habitat conditions in a reciprocal subsoil transfer experiment
- Author
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Preusser, Sebastian, primary, Marhan, Sven, additional, Poll, Christian, additional, and Kandeler, Ellen, additional
- Published
- 2017
- Full Text
- View/download PDF
19. Supplementary material to "Which are important soil parameters influencing the spatial heterogeneity of <sup>14</sup>C in soil organic matter?"
- Author
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John, Stephan, primary, Angst, Gerrit, additional, Kirfel, Kristina, additional, Preusser, Sebastian, additional, Mueller, Carsten W., additional, Leuschner, Christoph, additional, Kandeler, Ellen, additional, and Rethemeyer, Janet, additional
- Published
- 2016
- Full Text
- View/download PDF
20. Which are important soil parameters influencing the spatial heterogeneity of <sup>14</sup>C in soil organic matter?
- Author
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John, Stephan, primary, Angst, Gerrit, additional, Kirfel, Kristina, additional, Preusser, Sebastian, additional, Mueller, Carsten W., additional, Leuschner, Christoph, additional, Kandeler, Ellen, additional, and Rethemeyer, Janet, additional
- Published
- 2016
- Full Text
- View/download PDF
21. Biogeochemical limitations of carbon stabilization in forest subsoils#.
- Author
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Liebmann, Patrick, Mikutta, Robert, Kalbitz, Karsten, Wordell‐Dietrich, Patrick, Leinemann, Timo, Preusser, Sebastian, Mewes, Ole, Perrin, Eike, Bachmann, Jörg, Don, Axel, Kandeler, Ellen, Marschner, Bernd, Schaarschmidt, Frank, and Guggenberger, Georg
- Subjects
- *
SUBSOILS , *DISSOLVED organic matter , *CARBON cycle , *SOIL solutions , *TEMPERATE forests , *FOREST soils - Abstract
Background: Soils are important carbon (C) sinks or sources and thus of utmost importance for global carbon cycling. Particularly, subsoils are considered to have a high potential for additional C storage due to mineral surfaces still available for sorptive stabilization. Aims: Little information exists about the extent to which additional litter‐derived C is transferred to and stabilized in subsoils. This study aimed at evaluating the role of litter‐derived dissolved organic matter (DOM) inputs for the formation of stable mineral‐associated C in subsoils. Methods: We carried out a multiple‐method approach including field labeling with 13C‐enriched litter, exposure of 13C‐loaded reactive minerals to top‐ and subsoils, and laboratory sorption experiments. Results: For temperate forest soils, we found that the laboratory‐based C sink capacity of subsoils is unlikely to be reached under field conditions. Surface C inputs via litter leachates are little conducive to the subsoil C pool. Only 0.5% of litter‐derived C entered the subsoil as DOM within nearly 2 years and most of the recently sorbed C is prone to fast microbial mineralization rather than long‐term mineral retention. Desorption to the soil solution and an adapted microbial community re‐mobilize organic matter in subsoils faster than considered so far. Conclusions: We conclude that the factors controlling the current mineral retention and stabilization of C within temperate forest subsoils will likewise limit additional C uptake. Thus, in contrast to their widely debated potential to accrue more C, the role of forest subsoils as future C sink is likely overestimated and needs further reconsideration. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
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