Biochar amendment to soil changes dissolved organic matter content and composition

Smebye, Andreas Botnen; Alling, Vanja; Vogt, Rolf D.; Gadmar, Tone Charlotte; Mulder, Jan; Cornelissen, Gerard; Hale, Sarah E.

doi:10.1016/j.chemosphere.2015.04.087

Cited by 243 publications

(80 citation statements)

References 31 publications

(46 reference statements)

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“…This phenomenon may be associated with soil pH change under biochar addition. A previous study reported that increases in pH led to higher DOC solubility and desorption of DOC from mineral sites (Smebye et al, 2016). Higher pH promotes deprotonation of weak acid functional groups in the DOC molecules, which increase the hydrophilicity and thus the solubility of DOC (de Wit et al, 2001).…”

Section: Soil C Decompositionmentioning

confidence: 98%

Interactions between biochar and soil organic carbon decomposition: Effects of nitrogen and low molecular weight carbon compound addition

Jiang

Haddix

Cotrufo

2016

Soil Biology and Biochemistry

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Section: Soil C Decompositionmentioning

confidence: 98%

Interactions between biochar and soil organic carbon decomposition: Effects of nitrogen and low molecular weight carbon compound addition

Jiang

Haddix

Cotrufo

2016

Soil Biology and Biochemistry

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“…Analyses of benzenecarboxylic acids as molecular markers suggest that aromatic compounds derived from pyrogenic organic matter are transported within soil profiles and bind to mineral surfaces (Haumaier, 2010). The quantitative contribution of pyrogenic organic matter to DOM in soil is, however, still poorly studied (Smebye et al, 2016). Bulk analyses of aromatic matter used in most research on DOM fluxes (i.e., UV absorption) cannot distinguish whether the compounds derive from plant litter or from pyrogenic organic matter.…”

Section: Limits In Process Understandingmentioning

confidence: 99%

Gone or just out of sight? The apparent disappearance of aromatic litter components in soils

Klotzbücher

Kalbitz

Cerli

et al. 2016

SOIL

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Abstract. Uncertainties concerning stabilization of organic compounds in soil limit our basic understanding on soil organic matter (SOM) formation and our ability to model and manage effects of global change on SOM stocks. One controversially debated aspect is the contribution of aromatic litter components, such as lignin and tannins, to stable SOM forms. In the present opinion paper, we summarize and discuss the inconsistencies and propose research options to clear them.Lignin degradation takes place stepwise, starting with (i) depolymerization and followed by (ii) transformation of the water-soluble depolymerization products. The long-term fate of the depolymerization products and other soluble aromatics, e.g., tannins, in the mineral soils is still a mystery. Research on dissolved organic matter (DOM) composition and fluxes indicates dissolved aromatics are important precursors of stable SOM attached to mineral surfaces and persist in soils for centuries to millennia. Evidence comes from flux analyses in soil profiles, biodegradation assays, and sorption experiments. In contrast, studies on composition of mineral-associated SOM indicate the prevalence of non-aromatic microbial-derived compounds. Other studies suggest the turnover of lignin in soil can be faster than the turnover of bulk SOM. Mechanisms that can explain the apparent fast disappearance of lignin in mineral soils are, however, not yet identified.The contradictions might be explained by analytical problems. Commonly used methods probably detect only a fraction of the aromatics stored in the mineral soil. Careful data interpretation, critical assessment of analytical limitations, and combined studies on DOM and solid-phase SOM could thus be ways to unveil the issues.

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“…The most applied biochar nutrient functionalization process appears to be the blending with compost or a co-composting procedure [16,17]. In both cases, the porous biochar adsorptive surface sites are charged with nutrients [18,19], thereby stimulating microbial colonization [20], improving biochar surface reactivity through accelerated oxidative aging [21,22] and promoting dissolved organic carbon (DOC) adsorption and coating [18,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Fourfold Increase in Pumpkin Yield in Response to Low-Dosage Root Zone Application of Urine-Enhanced Biochar to a Fertile Tropical Soil

Schmidt¹,

Pandit²,

et al. 2015

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A widely abundant and invasive forest shrub, Eupatorium adenophorum, was pyrolyzed in a cost-efficient flame curtain kiln to produce biochar. The resulting biochar fulfilled all the requirements for premium quality, according to the European Biochar Certificate. The biochar was either applied alone or mixed with fresh cow urine (1:1 volume) to test its capacity to serve as slow release fertilizer in a pumpkin field trial in Nepal. Treatments included cow-manure compost combined with (i) urine-only; (ii) biochar-only or (iii) urine-loaded biochar. All materials were applied directly to the root zone at a biochar dry matter content of 750 kg·ha with the treatment where only urine was applied, and an 85% increase compared with the biochar-only treatment. This study showed for the first time that a low-dosage root zone application of urine-enhanced biochar led to substantial yield increases in a fertile silt loam soil. This was tentatively explained by the formation of organic coating of inner pore biochar surfaces by the urine impregnation, which improved the capacity of the biochar to capture and exchange plant nutrients.

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Biochar amendment to soil changes dissolved organic matter content and composition

Cited by 243 publications

References 31 publications

Interactions between biochar and soil organic carbon decomposition: Effects of nitrogen and low molecular weight carbon compound addition

Interactions between biochar and soil organic carbon decomposition: Effects of nitrogen and low molecular weight carbon compound addition

Gone or just out of sight? The apparent disappearance of aromatic litter components in soils

Fourfold Increase in Pumpkin Yield in Response to Low-Dosage Root Zone Application of Urine-Enhanced Biochar to a Fertile Tropical Soil

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