The carbon we do not see—the impact of low molecular weight compounds on carbon dynamics and respiration in forest soils: a review

Hees, Patrick A.W. van; Jones, Davey L.; Finlay, Roger D.; Godbold, Douglas L.; Lundström, Ulla

doi:10.1016/j.soilbio.2004.06.010

Cited by 579 publications

(328 citation statements)

References 59 publications

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“…Dissolved organic compounds are the primary substrates for microorganisms . DHA, commonly used as an index to describe the microbial activity of soils, is related to soil respiration and thus to the decay and formation of DOC compounds (van Hees et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

The dissolved organic matter as a potential soil quality indicator in arable soils of Hungary

Filep

Draskovits

Szabó

et al. 2015

Environ Monit Assess

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Section: Discussionmentioning

confidence: 99%

The dissolved organic matter as a potential soil quality indicator in arable soils of Hungary

Filep

Draskovits

Szabó

et al. 2015

Environ Monit Assess

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“…Another substrate quality-related factor that affects the CUE is that different monomers are metabolized via different metabolic pathways and therefore yield different respiration rates per unit carbon assimilated, i.e. CUE (Gommers et al 1988;Gottschalk 1986;Manzoni et al 2012;van Hees et al 2005). However, in this study the compounds taken up by the microorganisms would have been either monomeric glucose or cellobiose produced by the enzymatic cleavage of cellulose.…”

Section: Discussionmentioning

confidence: 92%

The effect of temperature and substrate quality on the carbon use efficiency of saprotrophic decomposition

et al. 2016

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Background and aims Mineralization of soil organic matter (SOM) constitutes a major carbon flux to the atmosphere. The carbon use efficiency (CUE) of the saprotrophic microorganisms mineralizing SOM is integral for soil carbon dynamics. Here we investigate how the CUE is affected by temperature, metabolic conditions, and the molecular complexity of the substrate. Methods We incubated O-horizon soil samples (with either 13 C-glucose or 13 C-cellulose) from a boreal coniferous forest at 4, 9, 14, and 19°C, and calculated CUEs based on the amount of 13 C-CO 2 and 13 C-labelled microbial biomass produced. The effects of substrate, temperature, and metabolic conditions (representing unlimited substrate supply and substrate limitation) on CUE were evaluated. Results CUE from metabolizing glucose was higher as compared to cellulose. A slight decrease in CUE with increasing temperature was observed in glucose amended samples (but only in the range 9-19°C), but not in cellulose amended samples. CUE differed significantly with metabolic conditions, i.e. CUE was higher during unlimited growth conditions as compared to conditions with substrate limitation. Conclusions We conclude that it is integral to account for both differences in CUE during different metabolic phases, as well as complexity of substrate, when interpreting temperature dependence on CUE in incubation studies.

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“…DOC, DON and DIN are metabolized at variable rates (van Hees et al 2005, Harms and Jones 2012, and DOC and DON can sorb to mineral soil Asner 2001, Kawahigashi et al 2006), transform along surface and subsurface flow paths (Striegl et al 2005, Koch et al 2013, or accumulate in pore waters in poorly drained areas (Wickland et al 2007). Nevertheless, studies of permafrost-impacted ecosystems across the circumpolar region have documented changes in DOC and TDN consistent with our conclusion that near-surface permafrost soils can be important DOC and TDN sources upon thaw (Harms et al 2013, Abbott et al 2015, Loiko et al 2017, Keuper et al 2012, Wauthy et al 2018.…”

Section: Discussionmentioning

confidence: 99%

Dissolved organic carbon and nitrogen release from boreal Holocene permafrost and seasonally frozen soils of Alaska

Wickland

Waldrop

Aiken

et al. 2018

Environ. Res. Lett.

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Permafrost (perennially frozen) soils store vast amounts of organic carbon (C) and nitrogen (N) that are vulnerable to mobilization as dissolved organic carbon (DOC) and dissolved organic and inorganic nitrogen (DON, DIN) upon thaw. Such releases will affect the biogeochemistry of permafrost regions, yet little is known about the chemical composition and source variability of active-layer (seasonally frozen) and permafrost soil DOC, DON and DIN. We quantified DOC, total dissolved N (TDN), DON, and DIN leachate yields from deep active-layer and near-surface boreal Holocene permafrost soils in interior Alaska varying in soil C and N content and radiocarbon age to determine potential release upon thaw. Soil cores were collected at three sites distributed across the Alaska boreal region in late winter, cut in 15 cm thick sections, and deep active-layer and shallow permafrost sections were thawed and leached. Leachates were analyzed for DOC, TDN, nitrate (NO 3 − ), and ammonium (NH 4 + ) concentrations, dissolved organic matter optical properties, and DOC biodegradability. Soils were analyzed for C, N, and radiocarbon ( 14 C) content. Soil DOC, TDN, DON, and DIN yields increased linearly with soil C and N content, and decreased with increasing radiocarbon age. These relationships were significantly different for active-layer and permafrost soils such that for a given soil C or N content, or radiocarbon age, permafrost soils released more DOC and TDN (mostly as DON) per gram soil than active-layer soils. Permafrost soil DOC biodegradability was significantly correlated with soil Δ 14 C and DOM optical properties. Our results demonstrate that near-surface Holocene permafrost soils preserve greater relative potential DOC and TDN yields than overlying seasonally frozen soils that are exposed to annual leaching and decomposition. While many factors control the fate of DOC and TDN, the greater relative yields from newly thawed Holocene permafrost soils will have the largest potential impact in areas dominated by organic-rich soils.

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The carbon we do not see—the impact of low molecular weight compounds on carbon dynamics and respiration in forest soils: a review

Cited by 579 publications

References 59 publications

The dissolved organic matter as a potential soil quality indicator in arable soils of Hungary

The dissolved organic matter as a potential soil quality indicator in arable soils of Hungary

The effect of temperature and substrate quality on the carbon use efficiency of saprotrophic decomposition

Dissolved organic carbon and nitrogen release from boreal Holocene permafrost and seasonally frozen soils of Alaska

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