Biochemical stabilization of soil organic matter in straw-amended, anaerobic and aerobic soils

Chen, Xi; Xu, Yujun; Gao, Hongjian; Mao, Jingdong; Chu, Wenying; Thompson, Michael L.

doi:10.1016/j.scitotenv.2017.12.293

Cited by 45 publications

(28 citation statements)

References 55 publications

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“…Accumulation of nonpolar organic coatings and development of SWR on sand-based growing media can be mitigated by wetting agents (Cisar et al, 2000;Kostka, 2000). Most wetting agents are nonionic surfactants, which have amphiphilic structures consisting of polar hydrophilic heads and nonpolar hydrophobic tails.…”

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confidence: 99%

“…Most wetting agents are nonionic surfactants, which have amphiphilic structures consisting of polar hydrophilic heads and nonpolar hydrophobic tails. Due to the high affinity among nonpolar structures, once wetting agents are watered in through irrigation/precipitation, these amphiphilic surfactants attach their nonpolar tails onto nonpolar hydrophobic surfaces, and subsequently increase the overall soil wettability by facing the polar heads toward the by-passing water (Cisar et al, 2000;Dekker et al, 2005;Kostka, 2000). Addition of wetting agents can hence reduce the surface tension of water from 73 to 32 mN m -1 or lower depending on the wetting agent selected and rate used, ultimately facilitating spontaneous wetting and water infiltration into hydrophobic sand (Song et al, 2014a).…”

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confidence: 99%

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Surfactant Chemistry Effects on Organic Matter Removal from Water Repellent Sand

Song¹,

Goyne²,

Kremer³

et al. 2018

Soil Science Soc of Amer J

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Soil surfactants, which represent a wide range of wetting agent chemistries, have been used as the primary tool for mitigating drought issues caused by soil water repellency (SWR). However, the residual effects of soil surfactants are often short-lived, requiring repeated applications. Alternatively, certain groups of wetting agents may remove hydrophobic organic matter for extended control of SWR. This laboratory study investigated the effects of selected wetting agent chemistries, including products of alkyl block polymer (ABP), nonionic surfactant + acidifiers (NIS), and polyoxyalkylene polymer (PoAP), for removing organic matter and reducing SWR. Naturally-occurring hydrophobic sand was packed into sand columns and subjected to wetting agent application. The treated columns were then washed three times with deionized water, and the volume of the leachates from each wash event was determined. Sand treated by PoAP showed enhanced water-holding capacity, although the effect diminished after the second wash. In comparison, ABP resulted in 2.3-fold greater output of combined dissolved organic carbon (DOC) and particulate organic carbon (POC) in the leachates than PoAP, and made the hydrophobic sand completely wettable. Alternatively, NIS showed similar effects compared with the control. Although PoAP reduced SWR to a minimum level, it was sorbed strongly to the sand, which resulted in 27% greater solid phase organic carbon (SOC) in treated sand, compared with the untreated control. However, the exact mechanisms underlying surfactant effects on DOC and POC are unclear and the long-term effects of surfactants following repeated application in the field are yet to be determined.

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confidence: 99%

mentioning

confidence: 99%

Surfactant Chemistry Effects on Organic Matter Removal from Water Repellent Sand

Song¹,

Goyne²,

Kremer³

et al. 2018

Soil Science Soc of Amer J

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“…Enzymes rule the biological catabolism of organic and mineral components in the soil. This process is closely related to organic matter, physical properties, and microbial activity and biomass; therefore, it is widely used to assess the quality of the soil, since it indicates changes in microbial activity and the presence of pollutants in the soil [14,20,21].…”

Section: Biological Indicatorsmentioning

confidence: 99%

Ecotoxicological Tests as a Tool to Assess the Quality of the Soil

Clasen¹,

Lisbôa²

2019

Soil Contamination and Alternatives for Sustainable Development

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Terrestrial ecotoxicology is used to evaluate the effects of substances that, whenever added to the soil, have impact on organisms and help measuring the responses from changes in the lethality, reproduction, development, and behavior of standardized soil organisms. Terrestrial ecotoxicology is a new tool that has been introduced in many countries, including Brazil, and yet little used. However, it is already widely used in Europe, besides being mandatory in research to indicate the toxicity of waste discharged in the soil. The aim of this chapter is to emphasize the importance and need of developing studies focused on the use of terrestrial ecotoxicology as a tool to assess fast and reliable responses from the toxicity of substances incorporated to the soil.

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“…Six et al (2000) and Garcia-Franco et al (2015) reported that O-alkyl C groups (such as carbohydrates) in SOC play a critical role in the formation of POM. As an effective indicator of soil quality, POM is closely linked to aggregation and its decomposition can enhance soil microbial activity and consequently the production of transient binding agents (Chen et al 2018). Soil microorganisms also play an important role in the formation of soil aggregates and the C sequestration, and their effects are mainly in the following two aspects.…”

Section: Introductionmentioning

confidence: 99%

Changes in soil fungal community on SOC and POM accumulation under different straw return modes in dryland farming

Fan

2021

Ecosyst Health Sustain

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We conducted a 2.5 year's field experiment to test the effects of straw incorporated evenly into the soil (EIS) on soil fungal community, SOC chemical composition, and particulate organic matter fractions via comparing with no straw returning (CK), straw mulching (SM), straw plowed into the soil (SP), and identified the linkages between soil fungal community as well as organic C accumulation and POM formation. Our results showed that EIS treatment significantly increased the concentrations of SOC and the proportion of Carbohydrate C, Di-O-alkyl C, and O-alkyl C in SOC structure, increased the mass proportion and OC contents of MA(c)POM and mM-POM in the upper 40 cm of soil. Meanwhile, EIS treatment increased the relative abundance of Ascomycota, Zygomycota, Chytridiomycota, and Dothideomycetes in 0-20 cm depths, and also had the highest relative abundance of Glomeromycetes and Dothideomycetes in the 20-40 cm soil Also, our study suggests that straw return enhanced the relative abundances of fungi involved in the carbon cycle and sequestration, including Zygomycota, Chytridiomycota, and Glomeromycota, and Ascomycota. The shifts in fungal community structure can accelerate organic C accumulation and the formation of soil particulate organic matter, especially in EIS treatment.

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Biochemical stabilization of soil organic matter in straw-amended, anaerobic and aerobic soils

Cited by 45 publications

References 55 publications

Surfactant Chemistry Effects on Organic Matter Removal from Water Repellent Sand

Surfactant Chemistry Effects on Organic Matter Removal from Water Repellent Sand

Ecotoxicological Tests as a Tool to Assess the Quality of the Soil

Changes in soil fungal community on SOC and POM accumulation under different straw return modes in dryland farming

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