Mechanisms for Increasing the pH Buffering Capacity of an Acidic Ultisol by Crop Residue-Derived Biochars

Shi, Renyong; Hong, Zhineng; Li, Jiu-yu; Jiang, Jun; Baquy, M. Abdulaha-Al; Xu, Runsheng; Qian, Wei

doi:10.1021/acs.jafc.7b02266

Cited by 108 publications

(52 citation statements)

References 43 publications

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“…The higher pH in each organic acid treatment with added biochar, relative to that in its no-added biochar counterpart, may be attributed to this effect though acid neutralization by the alkaline materials contained in the biochar might also be important. The protonation of biochar surfaces was likely to drive the change of the biochar surfaces from a negatively charged-dominated status to a neutral-or positively chargeddominated status (Qian et al, 2016;Shi et al, 2017;Mia et al, 2018). As such, the biochar surfaces were no longer attractive to the cationic heavy metals and this explains why the heavy metals mobilized by LMWOAs were not removed from the solution in the presence of the biochar.…”

Section: Discussionmentioning

confidence: 99%

Biochar immobilizes soil-borne arsenic but not cationic metals in the presence of low-molecular-weight organic acids

Alozie

Heaney

Lin

2018

Science of The Total Environment

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A batch experiment was conducted to examine the effects of biochar on the behaviour of soil-borne arsenic and metals that were mobilized by three low-molecular-weight organic acids. In the presence of citric acid, oxalic acid and malic acid at a molar concentration of 0.01M, the surface of biochar was protonated, which disfavours adsorption of the cationic metals released from the soil by organic acid-driven mobilization. In contrast, the oxyanionic As species were re-immobilized by the protonated biochar effectively. Biochar could also immobilize oxyanionic Cr species but not cationic Cr species. The addition of biochar increased the level of metals in the solution due to the release of the biochar-borne metals under attack by LMWOAs via cation exchange. Biochar could also have the potential to enhance reductive dissolution of iron and manganese oxides in the soil, leading to enhanced release of trace elements bound to these oxides. The findings obtained from this study have implications for evaluating the role of biochar in immobilizing trace elements in rhizosphere. Adsorption of cationic heavy metals on biochar in the presence of LMWOAs is unlikely to be a mechanism responsible for the impeded uptake of heavy metals by plants growing in heavy metal-contaminated soils.

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Section: Discussionmentioning

confidence: 99%

Biochar immobilizes soil-borne arsenic but not cationic metals in the presence of low-molecular-weight organic acids

Alozie

Heaney

Lin

2018

Science of The Total Environment

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“…The rebound of pyOM pH back to more circumneutral conditions (pH 6.0-7.2) by the end of the study was congruent with eventual loss of acidic exogenous materials via their neutralization through the ingress of basic cations mobilized by root exudates into the pyOM. The difference in the absolute magnitudes of pH declines and subsequent rebound observed across fire history can be reasonably explained as a fire-induced soil buffering effect; where previous burning imparts a higher soil buffering capacity to soils in the burnt zone (Mukherjee et al, 2014;Wang et al, 2014;Shi et al, 2017Shi et al, , 2018. The source of this buffering would be increased cation exchange capacity and basic cation content arising from higher soil carbon and ash-contained basic cations contents accumulating over progressive burns.…”

Section: Dynamics Of Pyom Ph and Stabilitymentioning

confidence: 98%

Physical Processes Dictate Early Biogeochemical Dynamics of Soil Pyrogenic Organic Matter in a Subtropical Forest Ecosystem

et al. 2018

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Quantifying links between pyOM dynamics, environmental factors and processes is central to predicting ecosystem function and response to future perturbations. In this study, changes in carbon (TC), nitrogen (TN), pH, and relative recalcitrance (R 50 ) for pineand cordgrass-derived pyOM were measured at 3-6 weeks intervals throughout the first year of burial in the soil. Objectives were to (1) identify key environmental factors and processes driving early-stage pyOM dynamics, and (2) develop quantitative relationships between environmental factors and observed changes in pyOM properties. The study was conducted in sandy soils of a forested ecosystem within the Longleaf pine range of the United States with a focus on links between changes in pyOM properties, fire history (FH), cumulative precipitation (P cum ), average temperature (T avg ) and soil residence time (SRT). P cum , SRT and T avg were the main factors controlling TC and TN accounting for 77-91% and 64-96% of their respective variability. Fire history, along with P cum , SRT and T avg , exhibited significant controlling effects on pyOM pH and R 50 -accounting for 48-91% and 88-93% of respective variability. Volatilization of volatiles and leaching of water-soluble components (in summer) and the sorption of exogenous organic matter (fall through spring) were most plausibly controlling pyOM dynamics in this study. Overall, our results point to climatic and land management factors and physicochemical process as the main drivers of pyOM dynamics in the pine ecosystems of the Southeastern US.

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“…Accordantly, in four amendment biochars produced from corn-straw, canola-straw, rice-straw, and peanut-straw, pH could increase from 4.96 to 6.69, 6.78, 7.45 and 8.40 and soil pH buffering capacity from 12.52 to 23.33, 23.14, 30.49 and 37.37mmol kg−1 pH−1, respectively. The increase in pH buffer capacity mainly due to the increased cations exchange capacity (CECs) after biochar application [49]. Meanwhile, the release of cations (K, Ca, Mg and Na) from biochar was the major cause of the increase in pH.…”

Section: Chemical Properties Improvementmentioning

confidence: 99%

Effects of Biochar Amendment on Soil Problems and Improving Rice Production under Salinity Conditions

Anwari¹,

Mandozai

Jin

2019

Adv. J. Grad. Res.

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Soil with poor physio-chemical and biological properties prevent plant growth. These poor characteristics may be due to soil creation processes, but also include largely inappropriate agricultural practices and/or anthropogenic pollution. During the last 4 decades, the world has lost one-third of its cropland due to pollution and erosion. Therefore, a series of operations is required to improve and recover the soil. Biochar is a new multifunctional carbon material extensively used as a modifier to improve soil quality and crop production. Previous studies have discussed the properties of biochar with varying soil pollutants and their effects on soil productivity and carbon sequestration. Comparatively, little attention has been paid to the effects of biochar application on rice growth in the problem of soils, especially in the saline-sodic soils. A comprehensive review of the literature with a high focusing on the effects of biochar application on problem soils and rice-growing under salinity conditions is needed. The present review gives an overview of the soil's problem, biochar amendment effects on physicochemical properties of soil, and how the biochar amendment could interact in soil microbes and root with remediation under salinity conditions for improving rice productivity. The findings of this review showed that biochar application can improve soil quality, reduce soil's problem and increase rice production under salinity conditions. It is anticipated that further researches on the biochar amendment will increase our understanding of the interactions of biochar with soil components, accelerate our attempts on soil remediation, and improve rice production under salinity conditions.

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Mechanisms for Increasing the pH Buffering Capacity of an Acidic Ultisol by Crop Residue-Derived Biochars

Cited by 108 publications

References 43 publications

Biochar immobilizes soil-borne arsenic but not cationic metals in the presence of low-molecular-weight organic acids

Biochar immobilizes soil-borne arsenic but not cationic metals in the presence of low-molecular-weight organic acids

Physical Processes Dictate Early Biogeochemical Dynamics of Soil Pyrogenic Organic Matter in a Subtropical Forest Ecosystem

Effects of Biochar Amendment on Soil Problems and Improving Rice Production under Salinity Conditions

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