Partitioning of carbon sources among functional pools to investigate short-term priming effects of biochar in soil: A (13)C study

The Science of the Total Environment
Bart KerréErik Smolders

Abstract

Biochar sequesters carbon (C) in soils because of its prolonged residence time, ranging from several years to millennia. In addition, biochar can promote indirect C-sequestration by increasing crop yield while, potentially, reducing C-mineralization. This laboratory study was set up to evaluate effects of biochar on C-mineralization with due attention to source appointment by using (13)C isotope signatures. An arable soil (S) (7.9 g organic C, OC kg(-1)) was amended (single dose of 10 g kg(-1) soil) with dried, grinded maize stover (leaves and stalks), either natural (R) or (13)C enriched (R*), and/or biochar (B/B*) prepared from the maize stover residues (450 °C). Accordingly, seven different combinations were set up (S, SR, SB, SR*, SB*, SRB*, SR*B) to trace the source of C in CO2 (180 days), dissolved organic-C (115 days) and OC in soil aggregate fractions (90 days). The application of biochar to soil reduced the mineralization of native soil organic C but the effect on maize stover-C mineralization was not consistent. Biochar application decreased the mineralization of the non-enriched maize stover after 90 days, this being consistent with a significant reduction of dissolved organic C concentration from 45 to 18 mg L(-1). ...Continue Reading

References

May 15, 2007·Nature·Johannes Lehmann
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Apr 30, 2013·The Science of the Total Environment·Mark FarrellJeff A Baldock
Jan 22, 2014·Scientific Reports·Bhupinder Pal Singh, Annette L Cowie

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Citations

Apr 8, 2016·The Science of the Total Environment·Fuxia PanHuaiying Yao
Sep 8, 2020·Global Change Biology·Bertrand GuenetFeng Zhou
Oct 19, 2019·Water Research·Toon van DaelErik Smolders

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