Vol 4: Long-term influence of biochar on native organic carbon mineralisation in a low-carbon clayey soil.Report as inadecuate



 Vol 4: Long-term influence of biochar on native organic carbon mineralisation in a low-carbon clayey soil.


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This article is from Scientific Reports, volume 4.AbstractBiochar can influence native soil organic carbon SOC mineralisation through -priming effects-. However, the long-term direction, persistence and extent of SOC priming by biochar remain uncertain. Using natural 13C abundance and under controlled laboratory conditions, we show that biochar-stimulated SOC mineralisation -positive priming- caused a loss of 4 to 44 mg C g−1 SOC over 2.3 years in a clayey, unplanted soil 0.42% OC. Positive priming was greater for manure-based or 400°C biochars, cf. plant-based or 550°C biochars, but was trivial relative to recalcitrant C in biochar. From 2.3 to 5.0 years, the amount of positively-primed soil CO2-C in the biochar treatments decreased by 4 to 7 mg C g−1 SOC. We conclude that biochar stimulates native SOC mineralisation in the low-C clayey soil but that this effect decreases with time, possibly due to depletion of labile SOC from initial positive priming, and-or stabilisation of SOC caused by biochar-induced organo-mineral interactions.



Author: Singh, Bhupinder Pal; Cowie, Annette L.

Source: https://archive.org/







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