Kinetics of aerobic decomposition in the leaching phase of allochthonous plant detritus

Fonseca, André Luiz dos Santos; Bianchini, Irineu; Pimenta, Cristiane Marques Monteiro; Mangiavacchi, Norberto; Soares, C. B. P.

doi:10.1590/s2179-975x2014000100010

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…As indicated by this work, as well as others (Grünheid et al, 2005; Fonseca et al, 2014; Liu et al, 2021), portions of recharged terrestrial DOM can be oxidized in hours to weeks. This oxidation limits concentrations of DOC in regions of aquifers far from locations of point recharge, for example where springs reverse flow or proximal to sinking streams.…”

Section: Discussionsupporting

confidence: 81%

Groundwater‐surface water interaction, dissolved organic carbon oxidation and dissolution in carbonate aquifers

Oberhelman,

Martin,

Flint

2024

Earth Surf Processes Landf

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The high primary porosity and permeability of eogenetic karst aquifers permit water recharged through secondary dissolution features to be temporarily stored in aquifer matrix porosity. The recharged water contains elevated dissolved organic carbon (DOC) concentrations that, when oxidized, enhance limestone dissolution and impact carbon cycling. We evaluate the relationship between DOC oxidation and limestone dissolution using observations at a stream sink‐rise system and reversing spring in the Floridan aquifer, north‐central Florida, USA, where subsurface residence times of recharged water are days and months, respectively. We estimate water chemical compositions during surface water‐groundwater interactions at these two systems with mixing models of surface water and groundwater compositions and compare them with measured DOC, dissolved inorganic carbon (DIC), Ca2+ and dissolved organic nitrogen (DON) concentrations. Differences between measured and modelled concentrations represent net changes that can be attributed to calcite dissolution and redox reactions, including DOC oxidation. DOC losses and Ca2+ gains exhibit significant (p < 0.01) inverse linear correlations at both the reversing spring (slope = −0.9, r2 = 0.99) and the sink‐rise system (slope = −0.4, r2 = 0.72). DOC oxidation in both systems was associated with decreases in the molar C:N ratio (DOC:DON). Significant (p < 0.01) positive linear correlations between increases in Ca2+ and DIC concentrations after correcting for DIC derived from calcite dissolution occurred at both the reversing spring (slope = 1.3, r2 = 0.99) and the sink‐rise system (slope = 1.61, r2 = 0.75). Greater deviations from the expected slope of −1 or +1 at the sink‐rise system than at the reversing spring indicate DOC oxidation contributes less dissolution at the sink‐rise system than at the reversing spring, likely from shorter storage in the subsurface. A portion of the deviation from expected slope values can be explained by the dissolution of Mg‐rich carbonate or dolomite rather than pure calcite dissolution. Despite this, slope values reflect kinetic effects controlling incomplete consumption of carbonic acid during dissolution reactions.

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Section: Discussionsupporting

confidence: 81%

Groundwater‐surface water interaction, dissolved organic carbon oxidation and dissolution in carbonate aquifers

Oberhelman,

Martin,

Flint

2024

Earth Surf Processes Landf

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“…e TBI Applied and Environmental Soil Science calculations are also based on green tea leaves going through both phases of biphasic decomposition and reaching a plateau after 90 days incubation, whereas rooibos tea should still be decomposing. Litter decomposition goes through two phases with a fast initial loss of soluble components through leaching into the soil, followed by a more gradual mass loss due to microbial decomposition and mineralization of cellulose and other compounds [21,22]. e mass of the green tea decline was biphasic with rapid decline to 14 d, and loss of soluble tannins, followed by a slower rate to 91 d, while the mass of rooibos tea declined at a slow rate over the whole incubation period.…”

Section: Discussionmentioning

confidence: 99%

Chemical Underpinning of the Tea Bag Index: An Examination of the Decomposition of Tea Leaves

Duddigan

Shaw

Alexander

et al. 2020

Applied and Environmental Soil Science

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Decomposition is a key flux of terrestrial carbon to the atmosphere. Therefore, gaining a better understanding of how plant litter decomposes in soil, and what governs this process, is vital for global climate models. The Tea Bag Index (TBI) was introduced by Keuskamp et al. (2013) as a novel method for measuring litter decomposition rate and stabilisation. The TBI uses two types of tea bags representing fast (green tea) and slow (rooibos tea) decomposition substrates as standardised litter bags. To date, the TBI method has been used in over 2000 locations across the globe. However, before now, there has been no information on how the composition of the tea leaves change during incubation. These data are crucial in determining the validity of the use of the TBI method globally, to ensure the tea leaves decompose in a way that is representative of so-called “native” litters. To provide chemical underpinning of the TBI method, a laboratory incubation of the tea bags was conducted with destructive sampling at 0, 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, and 91 d. The incubated tea was analysed for total C and N. In addition, C was characterised as alkyl, O-alkyl, aromatic, or carbonyl C using solid-state 13C nuclear magnetic resonance spectroscopy with cross-polarization and magic angle spinning (CPMAS NMR). The results suggest that changes in carbon in both tea types are comparable to other litter studies, with a net decrease in total C and relative proportion of O-alkyl C fraction, which contains carbohydrates and cellulose. We conclude that the decomposition of tea leaves in the bags used in the TBI is representative of other litters.

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“…Many studies have demonstrated that the leaching of labile materials is preponderant in the initial stage of decomposition (Baxter ; Aerts & de Caluwe ; Fonseca et al . ), being responsible for the intense loss in detritus mass (Bianchini & Cunha‐Santino ; Fonseca et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…), being responsible for the intense loss in detritus mass (Bianchini & Cunha‐Santino ; Fonseca et al . ). In the initial stage, the hydrostatic pressure could likely force leaching because of the physical action of compressing the detritus, although no significant influence was observed during this stage.…”

Section: Discussionmentioning

confidence: 99%

The effect of hydrostatic pressure on the decomposition of inundated terrestrial plant detritus of different quality in simulated reservoir formation

et al. 2016

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The formation of reservoirs usually incorporates the inundation of terrestrial vegetation in the basin. The decomposition of organic matter from the flooded vegetation may have several implications for reservoir functioning, including eutrophication and dissolved oxygen depletion. The hydrostatic pressure increases with depth in a reservoir, and its influence on the decomposition process has not previously been evaluated. This study was undertaken to evaluate the decomposition of terrestrial plant detritus of different qualities (leaves and branches) under different hydrostatic pressure conditions. Detritus were placed separately in glass bottles in the laboratory and incubated in tight stainless steel pressure vessels, simulating three different depths (surface, 30 and 100 m). The masses (mg) of particulate organic carbon (POC), dissolved organic carbon (DOC) and inorganic carbon (IC) were determined for the 4 months of the detritus decomposition simulated in this study. The mass values were transformed in percentages of the initial detritus carbon. The results of temporal variations of the compounds studied were fitted to a first-order biphasic decay model. The hydrostatic pressure exhibited no significant effects on litter decomposition. On the other hand, the detritus chemical composition (i.e. the presence of labile and refractory compounds) was the determining factor for the decomposition curve shape and for the differences observed between the leaves and branches. The greatest POC loss from leaves, and resulting larger DOC mass, indicated the leaves were more labile than the branches. The results also indicated the branches are the main detritus remaining in a reservoir over time.

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Kinetics of aerobic decomposition in the leaching phase of allochthonous plant detritus

Cited by 6 publications

References 24 publications

Groundwater‐surface water interaction, dissolved organic carbon oxidation and dissolution in carbonate aquifers

Groundwater‐surface water interaction, dissolved organic carbon oxidation and dissolution in carbonate aquifers

Chemical Underpinning of the Tea Bag Index: An Examination of the Decomposition of Tea Leaves

The effect of hydrostatic pressure on the decomposition of inundated terrestrial plant detritus of different quality in simulated reservoir formation

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