Concentrations of monosaccharides in humic substances in the early stages of humification

Koivula, Niina; Hänninen, Kari

doi:10.1016/s0045-6535(00)00167-3

Cited by 31 publications

(14 citation statements)

References 15 publications

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“…Koivula and Hanninen (2001) showed that the nitrogen content was higher in all humic fractions of the old bale and could be an indicator of microbial enrichment. As…”

Section: Evaluation Of the Composting Process By Ft-ir Spectramentioning

confidence: 96%

Evaluation of sewage sludge-based compost by FT-IR spectroscopy

et al. 2006

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“…Koivula and Hanninen (2001) showed that the nitrogen content was higher in all humic fractions of the old bale and could be an indicator of microbial enrichment. As…”

Section: Evaluation Of the Composting Process By Ft-ir Spectramentioning

confidence: 96%

Evaluation of sewage sludge-based compost by FT-IR spectroscopy

et al. 2006

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“…3), which further indicates that POM is mainly derived from allochthonous material originating from soils or litter in the drainage area. The carbohydrates in this allochthonous POM are probably associated with humic substances (Koivula and Hänninen, 2001;Fischer et al, 2007) or derived from highly degraded cellulosic material (Moran and Hodson, 1989). Although high phytoplanktonic production occurs in the spring, the flood events observed in this period generally diminish the production of autochthonous material because of the reduced light penetration to the river (Thurman, 1985).…”

Section: Seasonal and Interannual Variability Of Bulk Carbohydratesmentioning

confidence: 99%

The composition and flux of particulate and dissolved carbohydrates from the Rhone River into the Mediterranean Sea

et al. 2012

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Abstract.Carbohydrates are important components of the carbon cycle and may be used as indicators of the origin and the diagenetic status of marine and terrestrial organic matter. Nevertheless, comprehensive studies of both particulate (PCHO) and dissolved (DCHO) carbohydrates in rivers are scarce, and the seasonal and interannual variability of these compounds in relationship to the bulk particulate (POM) and dissolved organic matter (DOM) is largely unknown. For the period 2007-2009, we sampled once per month POM and DOM and measured the total suspended matter (TSM), POM, DOM, PCHO, and DCHO for the Rhône River, which flows into the Mediterranean Sea. Using these measurements, we estimated for the above parameters annual fluxes for the period 2007-2009. The estimated carbohydrate fluxes averaged 0.064 ± 0.026 × 10 10 moles C yr −1 for PCHO and 0.042 ± 0.008 × 10 10 moles C yr −1 DCHO, representing 6 % and 7 % of the annual flux of POC and DOC, respectively. During flood and low-water periods, POM variations were reflected into the PCHO pool, whereas this was not observed for DOC and DCHO, indicating a decoupling between particulate and dissolved organic matter. Our results also showed that flood and low-water periods may be differentiated using the ratios PCHO/DCHO and POC/DOC, which had a significant relationship.Based on the carbohydrate abundances in both the PCHO and DCHO pools, we conclude that this material mainly derives from allochthonous sources (vascular plants, bacteria and soils). Moreover, during flood events, an enrichment in mannose in POM was observed, probably reflecting an angiosperm source (leaves or grasses). By expanding our results to the northwestern Mediterranean Sea (Gulf of Lions), we found that the total organic carbon (TOC) fluxes of the Rhône River accounted for ∼1 % of the standing stock of seawater TOC. Considering that glucose is the most abundant carbohydrate in both particulate and dissolved organic matter pools (∼33 %), its annual flux in the northwestern Mediterranean Sea was estimated to 3.8 × 10 8 moles glucose.

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“…In fact, one possible route for formation of humic compounds is polysaccharides condensation with amines that originate the melanoidins (Stevenson, 1994). According to Koivula & Hä nninen (2001), the humus arises not only from degradation of refractory compounds but also from microbial synthesis.…”

Section: Introductionmentioning

confidence: 99%

Glucose uptake and extracellular polysaccharides (EPS) produced by bacterioplankton from an eutrophic tropical reservoir (Barra Bonita, SP–Brazil)

2007

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We have studied the production of polysaccharides by bacterioplankton in an eutrophic tropical reservoir (Barra Bonita, SP-Brazil) through a decay experiment using glucose as carbon source. The temporal evolution was monitored by measuring the total organic carbon and the contents of monosaccharides. The glucose added to the reservoir sample water was consumed at higher rates within the first hours of incubation, and after 30 days 94.4% of the carbon contents were mineralized; 4.2% remained as particulate organic carbon (POC) form and 1.5% as dissolved organic carbon (DOC) form. The production of polysaccharides occurred in two stages: within the first 48 h, there was intense glucose consumption with small POC increment (ca. 16%) and release of small quantities of dissolved polysaccharide. In the second, more intense stage production was accelerated after the 9th day of incubation, with the highest polysaccharide concentration measured on the 20th day. Such formation of polysaccharides was related to the excretion of capsules and sheaths by bacterioplankton, mainly in the senescence of heterotrophic populations, with release of reserve and structural intracellular materials.

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Concentrations of monosaccharides in humic substances in the early stages of humification

Cited by 31 publications

References 15 publications

Evaluation of sewage sludge-based compost by FT-IR spectroscopy

Evaluation of sewage sludge-based compost by FT-IR spectroscopy

The composition and flux of particulate and dissolved carbohydrates from the Rhone River into the Mediterranean Sea

Glucose uptake and extracellular polysaccharides (EPS) produced by bacterioplankton from an eutrophic tropical reservoir (Barra Bonita, SP–Brazil)

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