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

Kerre, Bart, Hernandez-Soriano, Maria C. and Smolders, Erik (2016) Partitioning of carbon sources among functional pools to investigate short-term priming effects of biochar in soil: A 13C study. Science of the Total Environment, 547 30-38. doi:10.1016/j.scitotenv.2015.12.107


Author Kerre, Bart
Hernandez-Soriano, Maria C.
Smolders, Erik
Title Partitioning of carbon sources among functional pools to investigate short-term priming effects of biochar in soil: A 13C study
Formatted title
Partitioning of carbon sources among functional pools to investigate short-term priming effects of biochar in soil: A 13C study
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 0048-9697
1879-1026
Publication date 2016-03-15
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2015.12.107
Open Access Status Not Open Access
Volume 547
Start page 30
End page 38
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted 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 13C 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 13C 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. However, no significant effect was observed for the enriched maize stover, presumably due to differences between the natural and enriched materials. The combined addition of biochar and enriched maize stover significantly increased (twofold) the presence of native soil organic C or maize derived C in the free microaggregate fraction relative to soil added only with stover. Although consistent effects among C sources and biochar materials remains elusive, our outcomes indicate that some biochar products can reduce mineralization and solubilization of other sources of C while promoting their physical protection in soil particles.
Keyword Biochar
Priming
Soil organic carbon
Soil aggregates
Stable Isotopes
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
 
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Created: Sun, 10 Jan 2016, 18:39:23 EST by Maria Hernandez-soriano on behalf of School of Agriculture and Food Sciences