Tracing organic carbon and microbial community structure in mineralogically different soils exposed to redox fluctuations

Winkler, Pauline; Kaiser, Klaus; Jahn, Reinhold; Mikutta, Robert; Fiedler, Sabine; Cerli, Chiara; Kölbl, Angelika; Schulz, Stefanie; Jankowska, Martha; Schloter, Michael; Müller-Niggemann, Cornelia; Schwark, Lorenz; Woche, Susanne K.; Kümmel, Steffen; Utami, Sri; Kalbitz, Karsten

doi:10.1007/s10533-019-00548-7

Cited by 17 publications

(10 citation statements)

References 75 publications

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“…After exposure to redox fluctuations mimicking wet rice production with and without addition of rice straw, SOM and microbial community structures have been traced in soils with different mineralogy (Winkler et al, 2019). In comparison to continuously oxic conditions, lower overall mineralization was shown for the samples from redox cycling with a tendency to store more C from straw addition.…”

Section: Interactions With Mineralsmentioning

confidence: 99%

“…In comparison to continuously oxic conditions, lower overall mineralization was shown for the samples from redox cycling with a tendency to store more C from straw addition. Under cycling, more strawderived C was allocated to C-retaining MOM, irrespective of the soil type (Winkler et al, 2019). Dissolution and precipitation of Fe oxides is essential for MOM formation and thus SOM protection, as more MOM was retained in soil with higher amounts of redox reactive minerals and cycling.…”

Section: Interactions With Mineralsmentioning

confidence: 99%

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Microbial Necromass in Soils—Linking Microbes to Soil Processes and Carbon Turnover

Kästner

Miltner

Thiele‐Bruhn

et al. 2021

Front. Environ. Sci.

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The organic matter of living plants is the precursor material of the organic matter stored in terrestrial soil ecosystems. Although a great deal of knowledge exists on the carbon turnover processes of plant material, some of the processes of soil organic matter (SOM) formation, in particular from microbial necromass, are still not fully understood. Recent research showed that a larger part of the original plant matter is converted into microbial biomass, while the remaining part in the soil is modified by extracellular enzymes of microbes. At the end of its life, microbial biomass contributes to the microbial molecular imprint of SOM as necromass with specific properties. Next to appropriate environmental conditions, heterotrophic microorganisms require energy-containing substrates with C, H, O, N, S, P, and many other elements for growth, which are provided by the plant material and the nutrients contained in SOM. As easily degradable substrates are often scarce resources in soil, we can hypothesize that microbes optimize their carbon and energy use. Presumably, microorganisms are able to mobilize biomass building blocks (mono and oligomers of fatty acids, amino acids, amino sugars, nucleotides) with the appropriate stoichiometry from microbial necromass in SOM. This is in contrast to mobilizing only nutrients and consuming energy for new synthesis from primary metabolites of the tricarboxylic acid cycle after complete degradation of the substrates. Microbial necromass is thus an important resource in SOM, and microbial mining of building blocks could be a life strategy contributing to priming effects and providing the resources for new microbial growth cycles. Due to the energy needs of microorganisms, we can conclude that the formation of SOM through microbial biomass depends on energy flux. However, specific details and the variability of microbial growth, carbon use and decay cycles in the soil are not yet fully understood and linked to other fields of soil science. Here, we summarize the current knowledge on microbial energy gain, carbon use, growth, decay, and necromass formation for relevant soil processes, e. g. the microbial carbon pump, C storage, and stabilization. We highlight the factors controlling microbial necromass contribution to SOM and the implications for soil carbon use efficiency (CUE) and we identify research needs for process-based SOM turnover modelling and for understanding the variability of these processes in various soil types under different climates.

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Section: Interactions With Mineralsmentioning

confidence: 99%

Section: Interactions With Mineralsmentioning

confidence: 99%

Microbial Necromass in Soils—Linking Microbes to Soil Processes and Carbon Turnover

Kästner

Miltner

Thiele‐Bruhn

et al. 2021

Front. Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…Because of their fine grain size and special chemical structure, reversible oxidation/reduction of structural Fe in clay minerals contributes to organic carbon preservation/degradation [47,48], nitrogen cycling [33,37] [42,43,49], which have important environmental implications. It could be inferred that alternating oxidation/reduction processes within redox-active minerals potentially occur in sunlight irradiated and anoxic zones (e.g., marsh, shoal area and coastal marine sediment), where dynamic hydrogeological fluctuations drive the metabolic connection with redox-active minerals [50].…”

Section: Significance Of Redox-active Minerals In Controlling Cyclingmentioning

confidence: 99%

“…In these environments, redox-active minerals may contribute to the bioremediation of pollutants and the fate/transport of several biogenic elements. These results from the biotransformation processes of organic pollutants and the cycling of biogenic elements are closely linked to the reactivity of redox-active minerals [9,[47][48][49]. Additionally, the mobilization/solubilization of As(V) can proceed via microbial dissimilatory reduction/detoxification pathways concomitant with reductive dissolution of Fe(III)-containing minerals in anoxic subsurface environments [35,49].…”

Section: Significance Of Redox-active Minerals In Controlling Cyclingmentioning

confidence: 99%

Recent advances in the roles of minerals for enhanced microbial extracellular electron transfer

Dong

Chen

Yan

et al. 2020

Renewable and Sustainable Energy Reviews

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Minerals are ubiquitous in the natural environment and have close contact with microorganisms. In various scenarios, microorganisms that harbor extracellular electron transfer (EET) capabilities have evolved a series of beneficial strategies through the mutual exchange of electrons with extracellular minerals to enhance survival and metabolism. These electron exchange interactions are highly relevant to the cycling of elements in the epigeosphere and have a profound significance in bioelectrochemical engineering applications. In this review, we summarize recent advances related to the effects of different minerals that facilitate the EET process and discuss the underlying mechanisms and outlooks for future applications. The promotional effects of minerals arise from their redox-active ability, electrical conductivity and photocatalytic capability. In mineral-promoted EET processes, various responses have concurrently arisen in microorganisms, such as stretching of electrically conductive pili (e-pili), upregulated expression of outer-membrane cytochromes (Cyts) and production of specific enzymes, and secretion of extracellular polymeric substances (EPSs). This review synthesizes the understanding of electron exchange mechanisms between microorganisms and minerals and highlights potential applications in development of renewable energy production and pollutant remediation, which are topics of particular significance to future exploitation of biotechnology.

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“…At the level of the individual cell, adaptation can refer either to phenotypic or genetic adaption (Poursat et al 2019). Several studies have described the adaptation of microorganisms to chemical stressors, which they then use as energy sources, i.e., growth-linked transformation, or acquire the ability to co-metabolize (Campa et al 2018;Poursat et al 2019;Wagner et al 2018;Winkler et al 2019). In addition, microbes can make a series of adjustments to environmental changes (limited bioavailability of chemicals), involving morphological, physiological, and behavioral adaptation.…”

Section: Enhanced Biotransformationmentioning

confidence: 99%

Natural Purification Through Soils: Risks and Opportunities of Sewage Effluent Reuse in Sub-surface Irrigation

Narain-Ford

Bartholomeus

Dekker

et al. 2020

Reviews of Environmental Contamination and Toxicology

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At global level there are several guidelines, i.e., non-mandatory recommendations, available concerning water reuse (Table 1). In 2006 the World Health Organization (WHO) published guidelines on the safe use of wastewater, intended as a tool for decision-makers and regulators to provide a consistent level of health protection in different settings. The guidelines can be adapted for implementation under specific environmental, sociocultural, and economic conditions at a national level (WHO 2006). The United States Environmental Protection Agency issued the last version of the "Guidelines for Water Reuse" (USEPA 2012). These guidelines include a wide range of reuse applications (e.g., agricultural irrigation and aquifer recharge) and apply similar approaches as described by the WHO (2006) and the Australian Government Initiative (2006) for controlling health and environmental risks. The most recent global guidelines for STP effluent reuse in agricultural irrigation were published in 2015 by the International Organization for Standardization (ISO 2015). These ISO guidelines include water quality requirements for CoECs. Remarkably, the State of California overtakes these global guidelines with specific regulations for CoECs (California Water Boards 2019). Consequently, these California water reuse regulations are being used as a global benchmark for the development of water reuse regulations worldwide. Noteworthy, California recently signed the Senate Bill No. 996 (Legislative Counsel Bureau 2018), which encourages communities to reuse STP effluent on-site. 2.2 Europe At European level the need to address management of water resources to prevent scarcity and droughts was acknowledged in the EU's Blueprint to safeguard Europe's water resources (Table 1). In this Blueprint the need to use STP effluent as an alternative water resource for irrigation purposes is re-emphasized (European Commission 2012). Six EU Member States

show abstract

Tracing organic carbon and microbial community structure in mineralogically different soils exposed to redox fluctuations

Cited by 17 publications

References 75 publications

Microbial Necromass in Soils—Linking Microbes to Soil Processes and Carbon Turnover

Microbial Necromass in Soils—Linking Microbes to Soil Processes and Carbon Turnover

Recent advances in the roles of minerals for enhanced microbial extracellular electron transfer

Natural Purification Through Soils: Risks and Opportunities of Sewage Effluent Reuse in Sub-surface Irrigation

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