Formation and mineralization kinetics of dissolved humic substances from aquatic macrophytes decomposition

Assunção, Argos Willian de Almeida; Souza, Brayan Pétrick de; Bianchini, Irineu

doi:10.1007/s11368-016-1519-x

Cited by 20 publications

(18 citation statements)

References 48 publications

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“…Moreover, FA derived from E. najas was the only FA sample where an increase in the phenolic O-H content was not observed (∼1400 cm -1 ). This agrees with the fact that E. najas has more labile content and presents higher mass decay than the other studied species [36]. However, this fact seems to not influence FA mass loss [36].…”

Section: Discussionsupporting

confidence: 89%

“…E. azurea and E. najas dissolved fraction showed higher values of C/N compared to O. cubense and S. molesta (Figure 1). This was an expected result since E. azurea and E. najas have higher contents of the labile/soluble fraction [36]. Besides that emergent macrophytes (e.g.…”

Section: Discussionsupporting

confidence: 53%

“…In a previous study [36], it became clear that O. cubense and S. molesta detritus are more recalcitrant than E. azurea and E. najas detritus. These recalcitrant detritus generated less DOC and promoted higher contents of dissolved HS, mainly under aerobic conditions.…”

Section: Discussionmentioning

confidence: 94%

“…Besides, dissolved humic compounds represented a small fraction of the total detritus of each plant. However, due to their recalcitrance, the dissolved HS can accumulate in aquatic environments [36].…”

Section: Discussionmentioning

confidence: 99%

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Molecular changes of aquatic humic substances formed from four aquatic macrophytes decomposed under different oxygen conditions

Assunção

Souza

Silva

et al. 2017

Chemistry and Ecology

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Aquatic macrophytes' decomposition is a source of recalcitrant carbon in the long term contributing to humic substances (HS) formation. Understanding the influence of plant detritus quality and oxygen availability over molecular changes of these compounds provides ecological information related to their cycling. This study described the molecular variation of dissolved HS from Eichhornia azurea, Egeria najas, Oxycaryum cubense and Salvinia molesta decomposition under aerobic and anaerobic conditions. The aquatic HS formed from the four aquatic macrophytes showed similar features (e.g. molecular weight and aromaticity). This fact indicates little influence of the detritus quality or availability of oxygen on the fulvic acids (FA) and humic acid characteristics. Under aerobic condition a decrease in the polysaccharides content in FA occurred. HS from E. najas were related to less-recalcitrant features, while HS from S. molesta were related to recalcitrant.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Molecular changes of aquatic humic substances formed from four aquatic macrophytes decomposed under different oxygen conditions

Assunção

Souza

Silva

et al. 2017

Chemistry and Ecology

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show abstract

“…In the third article of the special issue, Assunção et al (2018) evaluated the role of aquatic macrophytes in the formation and mineralization kinetics of dissolved HS under aerobic and anaerobic conditions. They observed an increase of HA and FA concentrations in water, with differences in formation rate due to the presence or absence of oxygen.…”

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confidence: 99%

Preface—special issue in memory of Frank J. Stevenson

2018

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Changes in Soil Organic C Fractions and C Pool Stability Are Mediated by C-Degrading Enzymes in Litter Decomposition of Robinia pseudoacacia Plantations

Zhi

Jian

et al. 2022

Microb Ecol

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Litter decomposition is the main source of soil organic carbon (SOC) pool, regarding as an important part of terrestrial ecosystem C dynamics. The turnover of SOC is mainly regulated by extracellular enzymes secreted by microorganisms. However, the response mechanism of soil C-degrading enzymes and SOC in litter decomposition remains unclear. To clarify how SOC fraction dynamics respond to C-degrading enzymes in litter decomposition, we used eld experiments to collect leaf litter and SOC fractions from the underlying layer in Robinia pseudoacacia plantations on the Loess Plateau. Our results showed that soil SOC, easily oxidizable organic C, soluble organic C and microbial biomass C increased signi cantly during the decomposition process. Litter decomposition signi cantly decreased soil hydrolase activity, but slightly increased oxidase activity. Correlation analysis results showed that SOC fractions were signi cantly positively correlated with the litter mass, lignin, soil moisture, and oxidase activity, but signi cantly negatively correlated with cellulose content and soil pH. Partial least squares path models revealed that the most direct factors affecting the SOC fractions of topsoil during litter decomposition were litter lignin and cellulose degradation, soil pH, and C-degrading enzymes. Furthermore, regression analysis showed that the decrease of SOC stability in litter decomposition was closely related to the decrease of soil hydrolase: oxidase ratio. These results highlighted that litter degradation-induced changes in C-degrading enzyme activity signi cantly affected SOC fractions. Furthermore, the distribution of soil hydrolase and oxidase modulated the stability of SOC during litter decomposition. These ndings provided a theoretical framework for a more comprehensive understanding of C turnover and stabilization mechanisms between plant and soil.

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Formation and mineralization kinetics of dissolved humic substances from aquatic macrophytes decomposition

Cited by 20 publications

References 48 publications

Molecular changes of aquatic humic substances formed from four aquatic macrophytes decomposed under different oxygen conditions

Molecular changes of aquatic humic substances formed from four aquatic macrophytes decomposed under different oxygen conditions

Preface—special issue in memory of Frank J. Stevenson

Changes in Soil Organic C Fractions and C Pool Stability Are Mediated by C-Degrading Enzymes in Litter Decomposition of Robinia pseudoacacia Plantations

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