Cycling downwards – dissolved organic matter in soils

Kaiser, Klaus; Kalbitz, Karsten

doi:10.1016/j.soilbio.2012.04.002

Cited by 647 publications

(546 citation statements)

References 25 publications

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“…Soil acts towards DOM as a chromatographic system, with the more sorptive compounds being retained and the more mobile ones being leached (Kalbitz and Kaiser, 2012). The decreased DOC concentration down the soil profile might be attributed to the sorption of DOM on reactive surfaces of plant-derived compounds in near surface compartments and the mineral matrix of the horizons (Kaiser and Guggenberger, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…In a forest ecosystem, organic matter in forms of plant litter, soil humus, microbial biomass and root exudates accumulates in the top soil layer (Kalbitz and Kaiser, 2008) and undergoes mineralization and humification with DOM migrating down the soil profile (Corvasce et al, 2006;Kaiser and Kalbitz, 2012). Studies have been carried out to investigate the distribution, biodegradation, physiochemical and biogeochemical properties of DOM along soil profiles (Kalbitz et al, 2005;Corvasce et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical and spectroscopic characteristics of dissolved organic matter in a forest soil profile

Bi¹,

Lu²,

Yuan³

et al. 2013

Journal of Environmental Sciences

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical and spectroscopic characteristics of dissolved organic matter in a forest soil profile

Bi¹,

Lu²,

Yuan³

et al. 2013

Journal of Environmental Sciences

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“…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). In line with this assumption is the observation that DOM in pore-water of agricultural soils can have lower molecular weights and lower aromaticity compared to soils under native vegetation (Accoe et al 2002;Chantigny 2003;Delprat et al 1997;Kalbitz et al 2003).…”

Section: Introductionmentioning

confidence: 97%

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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“…DOC is one of the main sources of subsoil SOC and, at the same time, an important substrate for microorganisms in deep soils, particularly under humid conditions (Kaiser and Kalbitz, 2012;Neff and Asner, 2001;Rumpel and KogelKnabner, 2011). DOC may be strongly retained in mineral soils by adsorption and may thus contribute to SOC sequestration (Schrumpf et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, because soil microbial activity in deep layers is limited by fresh and labile substrates, the input of fresh DOC may stimulate SOC decomposition in deep soils (Fontaine et al, 2007;Rumpel and Kogel-Knabner, 2011). Therefore, besides transport in the soil column by advection and diffusion, two main processes control DOC dynamics: (1) biological production and consumption and (2) adsorption to and desorption from soil minerals, and these processes in turn impact SOC cycling along the soil profile (Dwivedi et al, 2017;Kaiser and Kalbitz, 2012).…”

Section: Introductionmentioning

confidence: 99%

ORCHIDEE-SOM: modeling soil organic carbon (SOC) and dissolved organic carbon (DOC) dynamics along vertical soil profiles in Europe

et al. 2018

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Abstract. Current land surface models (LSMs) typically represent soils in a very simplistic way, assuming soil organic carbon (SOC) as a bulk, and thus impeding a correct representation of deep soil carbon dynamics. Moreover, LSMs generally neglect the production and export of dissolved organic carbon (DOC) from soils to rivers, leading to overestimations of the potential carbon sequestration on land. This common oversimplified processing of SOC in LSMs is partly responsible for the large uncertainty in the predictions of the soil carbon response to climate change. In this study, we present a new soil carbon module called ORCHIDEE-SOM, embedded within the land surface model ORCHIDEE, which is able to reproduce the DOC and SOC dynamics in a vertically discretized soil to 2 m. The model includes processes of biological production and consumption of SOC and DOC, DOC adsorption on and desorption from soil minerals, diffusion of SOC and DOC, and DOC transport with water through and out of the soils to rivers. We evaluated ORCHIDEE-SOM against observations of DOC concentrations and SOC stocks from four European sites with different vegetation covers: a coniferous forest, a deciduous forest, a grassland, and a cropland. The model was able to reproduce the SOC stocks along their vertical profiles at the four sites and the DOC concentrations within the range of measurements, with the exception of the DOC concentrations in the upper soil horizon at the coniferous forest. However, the Published by Copernicus Publications on behalf of the European Geosciences Union. 938M. Camino-Serrano et al.: ORCHIDEE-SOM model was not able to fully capture the temporal dynamics of DOC concentrations. Further model improvements should focus on a plant-and depth-dependent parameterization of the new input model parameters, such as the turnover times of DOC and the microbial carbon use efficiency. We suggest that this new soil module, when parameterized for global simulations, will improve the representation of the global carbon cycle in LSMs, thus helping to constrain the predictions of the future SOC response to global warming.

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Cycling downwards – dissolved organic matter in soils

Cited by 647 publications

References 25 publications

Electrochemical and spectroscopic characteristics of dissolved organic matter in a forest soil profile

Electrochemical and spectroscopic characteristics of dissolved organic matter in a forest soil profile

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

ORCHIDEE-SOM: modeling soil organic carbon (SOC) and dissolved organic carbon (DOC) dynamics along vertical soil profiles in Europe

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