Changes in dissolved lignin-derived phenols, neutral sugars, uronic acids, and amino sugars with depth in forested Haplic Arenosols and Rendzic Leptosols

Kaiser, Klaus; Guggenberger, Georg; Haumaier, Ludwig

doi:10.1023/b:biog.0000049340.77963.18

Cited by 123 publications

(87 citation statements)

References 37 publications

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“…Aluminosilicate clay minerals and metal oxides/hydroxides in soil selectively retain specific functional groups of organic molecules. Hydrophobic constituents are more strongly sorbed and more slowly transported through soils than hydrophilic molecules (Jardine et al 1989; Gu et al 1995;Kaiser et al 2004). Molecular hydrophobicity is primarily controlled by molecular size, polarity, charge, and bioavailability (Jardine et al 1989;Gu et al 1995;Arnarson and Keil, 2000;Theng 2012).…”

Section: Discussionmentioning

confidence: 99%

“…During infiltration, selective interactions between DOM and soil minerals occur and result in differential retention of certain DOM constituents within the soils. This concept has been described in the regional chromatography model in river systems and is also applicable to groundwater environments (Jardine et al 1989;Qualls and Haines 1992;Kaiser et al 2004). The chemical composition and bioavailability of DOM, which are key factors affecting water quality and diagenetic processes in groundwater, are altered during its transport through the soil column.…”

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Origins and bioavailability of dissolved organic matter in groundwater

et al. 2014

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Dissolved organic matter (DOM) in groundwater influences water quality and fuels microbial metabolism, but its origins, bioavailability and chemical composition are poorly understood. The origins and concentrations of dissolved organic carbon (DOC) and bioavailable DOM were monitored during a long-term (2-year) study of groundwater in a fractured-rock aquifer in the Carolina slate belt. Surface precipitation was significantly correlated with groundwater concentrations of DOC, bioavailable DOM and chromophoric DOM, indicating strong hydrological connections between surface and ground waters. The physicochemical and biological processes shaping the concentrations and compositions of DOM during its passage through the soil column to the saturated zone are conceptualized in the regional chromatography model. The model provides a framework for linking hydrology with the processes affecting the transformation, remineralization and microbial production of DOM during passage through the soil column. Lignin-derived phenols were relatively depleted in groundwater DOM indicating substantial removal in the unsaturated zone, and optical properties of chromophoric DOM indicated lower molecular weight DOM in groundwater relative to surface water. The prevalence of glycine, caminobutyric acid, and D-enantiomers of amino acids indicated the DOM was highly diagenetically altered. Bioassay experiments were used to establish DOCnormalized yields of amino acids as molecular indicators of DOM bioavailability in groundwater. A relatively small fraction (8 ± 4 %) of DOC in groundwater was bioavailable. The relatively high yields of specific D-enantiomers of amino acids indicated a substantial fraction (15-34 %) of groundwater DOC was of bacterial origin.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Origins and bioavailability of dissolved organic matter in groundwater

et al. 2014

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“…7). DOC quality may be changed due to preferential adsorption and mineralisation of specific DOC fractions (Kaiser et al 2004). In contrast, recent studies suggest that DOC is derived from SOC by ''autarkic'' DOC production in each soil horizon with little direct DOC translocation through the soil profile (Fröberg et al 2007;Steinbeiss et al 2008).…”

Section: Soil Disturbance and Doc Leachingmentioning

confidence: 99%

Controls on fluxes and export of dissolved organic carbon in grasslands with contrasting soil types

2008

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Export of dissolved organic carbon (DOC) from grassland ecosystems can be an important C flux which directly affects ecosystem C balance since DOC is leached from the soil to the groundwater. DOC fluxes and their controlling factors were investigated on two grassland sites with similar climatic conditions but different soil types (Vertisol vs. Arenosol) for a 2.5-year period. Parts of both grasslands were disturbed by deep ploughing during afforestation. Contrary to what was expected, ploughing did not increase DOC export but surface soil DOC concentrations decreased by 28% (Vertisol) and 14% (Arenosol). DOC flux from the soil profile was negatively influences by the clay content of the soil with seven times larger DOC export in the clay-poor Arenosol (55 kg C ha -1 a -1 ) than in the clay-rich Vertisol (8 kg C ha -1 a -1 ). At the Arenosol site, highest DOC concentrations were measured in late summer, whereas in the Vertisol there was a time lag of several months between surface and subsoil DOC with highest subsoil DOC concentrations during winter season. DOC export was not correlated with soil organic carbon stocks. Large differences in 14 C concentrations of 22-40 pMC between soil organic carbon and DOC in the subsoil indicated that both C pools are largely decoupled. We conclude that DOC export at both sites is not controlled by the vegetation but by physicochemical parameters such as the adsorption capacity of soil minerals and the water balance of the ecosystem. Only in the acidic sandy Arenosol DOC export was a significant C flux of about 8% of net ecosystem production.

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“…Lignin was a large contributing variable in forest floor leaf litter within our two-block PLS. Even though the biological degradation of lignin-derived phenols is minimal [67], these molecules have a strong tendency to become linked to soil minerals, especially iron and aluminium hydroxides [68][69][70]. In contrast to lignin, which was an important variable only in forest floor leaf litter in the two-block PLS, cellulose was inversely correlated between leaf litter and topsoil.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of Organic Matter in Leaf Litter and Topsoil within an Italian Alder (Alnus cordata (Loisel.) Desf.) Ecosystem

Innangi

Danise

d’Alessandro

et al. 2017

Forests

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Abstract:Forests are the most important land ecosystems that can mitigate the earth's ongoing climate change through their ability to sequester CO 2 as C stock in forest biomass and soil. Short-rotation deciduous hardwoods or N 2 -fixing species are ideal candidates for afforestation and reforestation, given that most of the carbon accumulates in the first 30 years. Alders match both of the above-mentioned features, and Italian alder, which is less dependent on riparian habitats and more drought tolerant, is an ideal candidate. Despite this, few studies exist of this tree species and its effect on soil organic matter. In this study, we focused on litter input and leaf litter decomposition dynamics, forest floor leaf litter and topsoil (0-5 cm) organic matter, and patterns of covariation from litter to topsoil. The leaf litter was rich in nitrogen and decomposed quickly (k = 0.002 day −1 ). There was a large organic carbon stock, which varied in the leaf litter (from 1.7 ± 0.3 Mg/ha in January to 0.4 ± 0.1 Mg/ha in July) and was stable in the topsoil (on average 28.6 ± 1.5 Mg/ha). Stocks for total nitrogen, cellulose, lignin, water and ethanol extractables, and total phenols were also evaluated. In order to investigate patterns of covariation in these stocks from litter to soil, we used two-block partial least squares. The first axis showed that from January to July there was a reduction of total nitrogen, lignin and cellulose in the forest floor leaf litter, while in the topsoil there was a decrease in water extractables and total organic carbon. The second axis showed minor phenomena involving phenols, water and ethanol extractables, and total N. The fast turnover of dissolved organic matter fractions (water and ethanol extractables), linked with cellulose and lignin dynamics, might suggest that within the Italian alder ecosystem there is a reasonably fast formation of stable C compounds in the soil. Thus, Italian alder is an ideal species for afforestation and reforestation, which could be particularly interesting for land-use policies.

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Changes in dissolved lignin-derived phenols, neutral sugars, uronic acids, and amino sugars with depth in forested Haplic Arenosols and Rendzic Leptosols

Cited by 123 publications

References 37 publications

Origins and bioavailability of dissolved organic matter in groundwater

Origins and bioavailability of dissolved organic matter in groundwater

Controls on fluxes and export of dissolved organic carbon in grasslands with contrasting soil types

Dynamics of Organic Matter in Leaf Litter and Topsoil within an Italian Alder (Alnus cordata (Loisel.) Desf.) Ecosystem

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