An evaluation of some oxidative degradation methods of humic substances applied to carbohydrate‐derived humic‐like polymers

Almendros, G.; Leal, J.A.

doi:10.1111/j.1365-2389.1990.tb00044.x

Cited by 13 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously at this study site, higher rates of respiration have been observed under SR treatments, in line with greater concentrations of total SOC and thus substrate availability [29,36]. This is similar to many other results recorded worldwide, where stubble burning is typically observed to reduce soil respiration [37][38][39][40]. However, in the current study, there was no significant difference in the total soil organic C content in SB and SR treatments [37], and the main stubble effect did not have a significant impact on total cumulative respiration.…”

Section: Microbial Respirationsupporting

confidence: 90%

Effect of 50 Years of No-Tillage, Stubble Retention, and Nitrogen Fertilization on Soil Respiration, Easily Extractable Glomalin, and Nitrogen Mineralization

et al. 2022

View full text Add to dashboard Cite

In subtropical regions, we have an incomplete understanding of how long-term tillage, stubble, and nitrogen (N) fertilizer management affects soil biological functioning. We examined a subtropical site managed for 50 years using varying tillage (conventional till (CT) and no-till (NT)), stubble management (stubble burning (SB) and stubble retention (SR)), and N fertilization (0 (N0), 30 (N30), and 90 (N90) kg ha−1 y−1) to assess their impact on soil microbial respiration, easily extractable glomalin-related soil protein (EEGRSP), and N mineralization. A significant three-way tillage × stubble × N fertilizer interaction was observed for soil respiration, with NT+SB+N0 treatments generally releasing the highest amounts of CO2 over the incubation period (1135 mg/kg), and NT+SR+N0 treatments releasing the lowest (528 mg/kg). In contrast, a significant stubble × N interaction was observed for both EEGRSP and N mineralization, with the highest concentrations of both EEGRSP (2.66 ± 0.86 g kg−1) and N mineralization (30.7 mg/kg) observed in SR+N90 treatments. Furthermore, N mineralization was also positively correlated with EEGRSP (R2 = 0.76, p < 0.001), indicating that EEGRSP can potentially be used as an index of soil N availability. Overall, this study has shown that SR and N fertilization have a positive impact on soil biological functioning.

show abstract

Section: Microbial Respirationsupporting

confidence: 90%

Effect of 50 Years of No-Tillage, Stubble Retention, and Nitrogen Fertilization on Soil Respiration, Easily Extractable Glomalin, and Nitrogen Mineralization

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The onset of fruiting body development correlates with the nutritional exhaustion of the growth substrates (Kües and Liu, 2000). The C/N ratios of soil after burning are usually lower than in the original soils, a phenomenon frequently cited in several types of post-fire soils (Almendros and Leal, 1990;González-Pérez et al, 2004), and nutrient depletion is an essential trigger for fruiting body initiation (Sakamoto, 2018;Almási et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Comparative genomics of pyrophilous fungi reveals a link between fire events and developmental genes

Steindorff

Carver

Calhoun

et al. 2020

Environmental Microbiology

View full text Add to dashboard Cite

Summary Forest fires generate a large amount of carbon that remains resident on the site as dead and partially ‘pyrolysed’ (i.e. burnt) material that has long residency times and constitutes a significant pool in fire‐prone ecosystems. In addition, fire‐induced hydrophobic soil layers, caused by condensation of pyrolysed waxes and lipids, increase post‐fire erosion and can lead to long‐term productivity losses. A small set of pyrophilous fungi dominate post‐fire soils and are likely to be involved with the degradation of all these compounds, yet almost nothing is currently known about what these fungi do or the metabolic processes they employ. In this study, we sequenced and analysed genomes from fungi isolated after Rim fire near Yosemite National Park in 2013 and showed the enrichment/expansion of CAZymes and families known to be involved in fruiting body initiation when compared to other basidiomycete fungi. We found gene families potentially involved in the degradation of the hydrophobic layer and pyrolysed organic matter, such as hydrophobic surface binding proteins, laccases (AA1_1), xylanases (GH10, GH11), fatty acid desaturases and tannases. Thus, pyrophilous fungi are important actors to restate the soil's functional capabilities.

show abstract

“…During forest fires, soil temperatures at the soil surface usually vary between 200 and 300°C, and even low temperatures of 40-70°C cause degradation of biological material (Knicker 2007). Temperatures reaching 300°C may cause structural changes in SOM, resulting in the formation of pyrogenic compounds (Almendros and Leal 1990;Knicker et al 1996). Macromolecules, such as cellulose and lignin, may go through transformations during fire even at lower temperatures, leading to the formation of compounds, which are more recalcitrant and thus become unrecognisable to certain enzymes (Almendros and González-Vila 2012).…”

Section: Introductionmentioning

confidence: 99%

Forest fires in Canadian permafrost region: the combined effects of fire and permafrost dynamics on soil organic matter quality

Aaltonen

Köster

et al. 2019

Biogeochemistry

View full text Add to dashboard Cite

Wildfires burn approximately 1% of boreal forest yearly, being one of the most significant factors affecting soil organic matter (SOM) pools. Boreal forests are largely situated in the permafrost zone, which contains half of global soil carbon (C). Wildfires advance thawing of permafrost by burning the insulating organic layer and decreasing surface albedo, thus increasing soil temperatures. Fires also affect SOM quality through chemical and physical changes, such as the formation of resistant C compounds. The long-term post-fire effects on SOM quality, degradability and isotopic composition are not well known in permafrost forests. We studied the effect of forest fires on the proportional sizes of SOM pools with chemical fractionation (extracting with water, ethanol and acid) of soil samples (5, 30 and 50 cm depths) collected from a fire chronosequence in the upland mineral soils of the Canadian permafrost zone. We also determined the 13 C and 15 N isotopic composition of soil after fire. In the topsoil horizon (5 cm) recent fire areas contained a smaller fraction of labile SOM and were slightly more enriched with 15 N and 13 C than older fire areas. The SOM fraction ratios reverted towards pre-fire status with succession. Changes in SOM were less apparent deeper in the soil. Best predictors for the size of recalcitrant SOM

show abstract

An evaluation of some oxidative degradation methods of humic substances applied to carbohydrate‐derived humic‐like polymers

Cited by 13 publications

References 29 publications

Effect of 50 Years of No-Tillage, Stubble Retention, and Nitrogen Fertilization on Soil Respiration, Easily Extractable Glomalin, and Nitrogen Mineralization

Effect of 50 Years of No-Tillage, Stubble Retention, and Nitrogen Fertilization on Soil Respiration, Easily Extractable Glomalin, and Nitrogen Mineralization

Comparative genomics of pyrophilous fungi reveals a link between fire events and developmental genes

Forest fires in Canadian permafrost region: the combined effects of fire and permafrost dynamics on soil organic matter quality

Contact Info

Product

Resources

About