2018
DOI: 10.1002/jpln.201800261
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Historical charcoal additions alter water extractable, particulate and bulk soil C composition and stabilization

Abstract: The objective of this work was to investigate the chemical composition and the quantitative changes in soil organic matter (SOM) fractions in response to multiple historical inputs of charcoal that ceased > 60 years ago. The topsoil (0–5 cm) and subsoil (5–20 cm) samples of charcoal enriched soils and the unamended reference soils were assessed for C and N contents in bulk soil, particulate organic matter (POM) fractions and water extractable organic matter (WEOM). The SOM molecular characteristics were invest… Show more

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Cited by 20 publications
(10 citation statements)
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References 61 publications
(93 reference statements)
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“…Comparison of our fractionation results 4 years after biochar application to biochar allocation in soil fractions over much longer timescales provides insights into the legacy effects of biochar. So far, our results corroborate experimental findings 60 years after charcoal application, also in Germany ( Abdelrahman et al., ): in both cases, additions of biochar/charcoal resulted in significant increases in the OC content of particulate and physically stabilized SOC fractions, but biochar/charcoal disproportionally increased OC content in fractions with no to weak physical protection and decreased the proportion of total SOC held in more highly physically stabilized fractions. However, in the long‐term, the effects of biochar on the distribution of SOM across fractions may differ between the forest soil of Abdelrahman et al.…”
Section: Discussionsupporting
confidence: 91%
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“…Comparison of our fractionation results 4 years after biochar application to biochar allocation in soil fractions over much longer timescales provides insights into the legacy effects of biochar. So far, our results corroborate experimental findings 60 years after charcoal application, also in Germany ( Abdelrahman et al., ): in both cases, additions of biochar/charcoal resulted in significant increases in the OC content of particulate and physically stabilized SOC fractions, but biochar/charcoal disproportionally increased OC content in fractions with no to weak physical protection and decreased the proportion of total SOC held in more highly physically stabilized fractions. However, in the long‐term, the effects of biochar on the distribution of SOM across fractions may differ between the forest soil of Abdelrahman et al.…”
Section: Discussionsupporting
confidence: 91%
“…However, in the long‐term, the effects of biochar on the distribution of SOM across fractions may differ between the forest soil of Abdelrahman et al. () and our soil due to frequent mechanical disturbance in agricultural contexts, causing a decrease in biochar particle size ( Joseph et al., ) but also the destruction of soil aggregates.…”
Section: Discussionmentioning
confidence: 92%
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“…It is known that biochar can undergo a maturation process after application as a product of various processes. Maturation involves surface oxidation [49,50], sorption of soil organic matter rich in oxygen-containing groups [51,52] and increase its surface area while decreasing the pore diameter, relative to fresh biochar [53]. Another possible cause for the different performances of the New vs. Old plots might be related to the initial water repellency characteristics of biochar [54,55], which change with aging [56,57].…”
Section: Measured Swc and Transformationmentioning
confidence: 99%
“…This could lead to conditions sufficient for nitrification in SA soil leading to the slightly higher nitrate levels, or alternatively, the reduction of denitrification conditions which would lead to reduced nitrate losses as N2O gas. In addition, charcoal added to soil has been found to alleviate factors that inhibit nitrification (Abdelrahman et al, 2018), suggesting there may be benefits for nitrate levels from the anthropogenic additions of charcoal to the SA soil. As seen in our findings, soil nutrient dynamics within sealed soils remain largely unknown, highlighting the importance of further research into sealed soil processes and the potential effects of anthropogenic materials on these important soil functions.…”
Section: Anthropogenic Additions Influence Nutrient Dynamicsmentioning
confidence: 99%