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|Title:||Long-term influence of biochar on native organic carbon mineralisation in a low-carbon clayey soil||Contributor(s):||Singh, Bhupinder Pal (author); Cowie, Annette (author)||Publication Date:||2014||Open Access:||Yes||DOI:||10.1038/srep03687||Handle Link:||https://hdl.handle.net/1959.11/14957||Abstract:||Biochar 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.||Publication Type:||Journal Article||Source of Publication:||Scientific Reports, v.4, p. 1-9||Publisher:||Nature Publishing Group||Place of Publication:||United Kingdom||ISSN:||2045-2322||Field of Research (FOR):||050301 Carbon Sequestration Science||Socio-Economic Outcome Codes:||961499 Soils not elsewhere classified||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 173
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