Soil organic matter dynamics: a biological perspective derived from the use of compound‐specific isotopes studies

Gleixner, Gerd

doi:10.1007/s11284-012-1022-9

Cited by 200 publications

(159 citation statements)

References 86 publications

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“…Comparing the maps for each element, before and after application, there were a few similarities in the patterns of spatial distribution, indicating that the incorporation of neem cake must have influenced the dynamics of these nutrients in the treated area. The increase in the variability of C-CO 2 evolution rate due to neem cake incorporation possibly results from the influence of the organic matter on the different microbial communities (Gleixner, 2013). For OC (Figures 1F-C1, 1F-C2 and 1F-C3), neem cake application increased the variability and the contents in the soil, showing narrower lines at the end of the study.…”

Section: Resultsmentioning

confidence: 91%

Spatial variability of Regosol chemical atributes in guava management with neem under semi-arid conditions

Castro

Pedrosa

Montenegro

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TConsidering the relevant importance of guava (Psidium guajava) in Northeastern Brazil along with the benefits of neem cake amendments on soil characteristics, this work evaluated the effects of neem cake on chemical attributes of a Regosol under irrigated guava orchard in an alluvial valley of Pernambuco semi-arid region. Evaluations were carried out in two areas (area 1 -with neem cake; area 2 -without neem cake) at three periods: before the first application of neem cake, 90 days after the first application and 90 days after the second application. A regular 8 × 6-point grid was designed in each area and the soil was sampled for total organic carbon, pH, soluble salts (Na + , K + , Ca 2+ and Mg 2+ ) and total nitrogen contents, as well as soil C-CO 2 evolution rate in soil. Geostatistical analysis pointed out the spherical model as the best fit to the studied variables, followed by the Gaussian model, with ranges from 12 to 60.5 m. Neem cake incorporation increased spatial variability and the contents of the evaluated soil chemical attributes.Variabilidade espacial de atributos químicos em Neossolo no manejo da goiabeira com nim no semiárido R E S U M O Considerando a importância do cultivo de goiabeiras (Psidium guajava) para o nordeste do Brasil e os benefícios da aplicação da torta de nim nas características do solo, avaliou-se o efeito da aplicação de torta de nim nos atributos químicos de um Neossolo Regolítico cultivado com goiabeiras irrigadas no semiárido de Pernambuco. Para as avaliações foram usadas duas áreas (área 1 -com nim; área 2 -sem nim) e três períodos, antes da aplicação do nim, 90 dias após a primeira aplicação e 90 dias após a segunda aplicação; assim, 96 amostras de solo foram coletadas em duas malhas regulares de 8 × 6 pontos amostrais e realizadas análises do teor de carbono orgânico total, pH, teores de sais solúveis (Na + , K + , Ca 2+ e Mg 2+ ), nitrogênio total e taxa de evolução C-CO 2 do solo. O modelo esférico foi o que melhor se ajustou às variáveis estudadas seguido pelo gaussiano, com alcances que variaram de 12 a 60,5 m. A incorporação da torta de nim aumentou a variabilidade espacial e a oferta dos atributos de solo estudados.

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Section: Resultsmentioning

confidence: 91%

Spatial variability of Regosol chemical atributes in guava management with neem under semi-arid conditions

Castro

Pedrosa

Montenegro

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…SOM models that include microbial community structure have shown that changes in microbial physiology, often expressed as CUE (defined as the amount of C in microbial biomass relative to C respired and in biomass), have the potential to dramatically impact the fate of C stocks to climate change (Allison et al, 2010;Schimel, 2013;Wieder et al, 2013;Li et al, 2014), and experimental evidence shows that CUE can be altered by substrate quality, temperature, and N availability (Dijkstra et al, 2011;Manzoni et al, 2012;Frey et al, 2013;Tucker et al, 2013). This concept of changes to CUE is of particular importance as a large portion of SOM has been attributed to microbial derived products, which may have a relatively long turnover time (Simpson et al, 2007;Liang and Balser, 2008;Miltner et al, 2012;Gleixner, 2013). It is therefore necessary to determine the underlying mechanisms and the extent that microbial community structure and function impacts C turnover in response to these global change scenarios.…”

Section: Introductionmentioning

confidence: 99%

Microbial community structure mediates response of soil C decomposition to litter addition and warming

Creamer

Menezes

Krull

et al. 2015

Soil Biology and Biochemistry

198

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“…Recent advances in soil science have shown that (1) SOM degradation is rather controlled by physical protection and accessibility of soil microorganisms to SOM rather than the chemical composition, or recalcitrance, of soil organic molecules (Dungait et al 2012;Schmidt et al 2011) and (2) that SOM decomposition leads to a progressive evolution of SOM chemistry toward a more microbial character due to the incorporation of microbial metabolites and microbially reworked plant-derived compounds in the residual SOM (Gleixner 2013;Hobara et al 2014;Malik and Gleixner 2013). Several agricultural practices can potentially affect one of these two features or both.…”

Section: Discussionmentioning

confidence: 99%

“…Several soil management practices such as tillage or organic fertilizer application are known to stimulate the microbial decomposition of SOM (Luo et al 2010;McLauchlan 2006;Pisani et al 2016). Beyond their role as decomposers, microorganisms are a ubiquitous source of OM to soils through recycling of plant and animal-derived OM and synthesis of new products (Dungait et al 2012;Gleixner 2013;Miltner et al 2012). Consequently, SOM decomposition leads to an enrichment in microbial compounds in residual SOM at the expense of plant-derived compounds (Hobara et al 2014;Kaiser and Kalbitz 2012;Malik and Gleixner 2013).…”

Section: Introductionmentioning

confidence: 99%

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

et al. 2017

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The impact of human activities on the concentrations and composition of dissolved organic matter (DOM) and particulate organic matter (POM) was investigated in the Walloon Region of the Meuse River basin (Belgium). Water samples were collected at different hydrological periods along a gradient of human disturbance (50 sampling sites ranging from 8.0 to 20,407 km 2 ) and during a 1.5 year monitoring of the Meuse River at the city of Liège. This dataset was completed by the characterization of the DOM pool in groundwaters. The composition of DOM and POM was investigated through elemental (C:N ratios), isotopic (d 13 C) and optical measurements including excitation emission matrix fluorescence with parallel factor analysis (EEM-PARAFAC). Land use was a major driver on fluvial OM composition at the regional scale of the Meuse Basin, the composition of both fluvial DOM and POM pools showing a shift toward a more microbial/algal and less plant/soil-derived character as human disturbance increased. The comparison of DOM composition between surface and groundwaters demonstrated that this pattern can be attributed in part to the transformation of terrestrial sources by agricultural practices that promote the decomposition of soil organic matter in agricultural lands and subsequent microbial inputs in terrestrial sources. In parallel, human land had contrasting effects on the autochthonous production of DOM and POM. While the in-stream generation of fresh DOM through biological activity was promoted in urban areas, summer autochthonous POM production was not influenced by land use. Finally, soil erosion by agricultural management practices favored the transfer of terrestrial organic matter via the particulate phase. Stable isotope data suggest that the hydrological transfer of terrestrial DOM and POM in humanimpacted catchment are not subject to the same controls, and that physical exchange between these two pools of organic matter is limited.

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Soil organic matter dynamics: a biological perspective derived from the use of compound‐specific isotopes studies

Abstract: Current attempts to explain the persistence of carbon in soils focuses on explanations such as the recalcitrant plant residues and the physical isolation of substrates from decomposers.

Cited by 200 publications

References 86 publications

Spatial variability of Regosol chemical atributes in guava management with neem under semi-arid conditions

Spatial variability of Regosol chemical atributes in guava management with neem under semi-arid conditions

Microbial community structure mediates response of soil C decomposition to litter addition and warming

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

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