Interactions between biochar stability and soil organisms: review and research needs

European Journal of Soil Science - Tập 64 Số 4 - Trang 379-390 - 2013
Nele Ameloot1, Ellen R. Gräber2, Frank Verheijen3, Stefaan De Neve1
1Research Group of Soil Fertility and Nutrient Management, Department of Soil Management, Ghent University, Coupure Links 653, 9000 Gent, Belgium
2Institute of Soil, Water and Environmental Sciences The Volcani Center, Agricultural Research Organization POB 6, 50250 Bet Dagan Israel
3Department of Environment and Planning Centre for Environmental and Marine Studies, University of Aveiro 3810‐193 Aveiro Portugal

Tóm tắt

Summary

The stability of biochar in soils is the cornerstone of the burgeoning worldwide interest in the potential of the pyrolysis/biochar platform for carbon (C) sequestration. While biochar is more recalcitrant in soil than the original organic feedstock, an increasing number of studies report greater C‐mineralization in soils amended with biochar than in unamended soils. Soil organisms are believed to play a central role in this process. In this review, the variety of interactions that occur between soil micro‐, meso‐ and macroorganisms and biochar stability are assessed. In addition, different factors reported to influence biochar stability, such as biochar physico‐chemical characteristics, soil type, soil organic carbon (SOC) content and agricultural management practices are evaluated. A meta‐analysis of data in the literature revealed that biochar‐C mineralization rates decreased with increasing pyrolysis temperature, biochar‐C content and time. Enhanced release of CO2 after biochar addition to soil may result from (i) priming of native SOC pools, (ii) biodegradation of biochar components from direct or indirect stimulation of soil organisms by biochar or (iii) abiotic release of biochar‐C (from carbonates or chemi‐sorbed CO2). Observed biphasic mineralization rates suggest rapid mineralization of labile biochar compounds by microorganisms, with stable aromatic components decomposed at a slower rate. Comparatively little information is available on the impact of soil fauna on biochar stability in soil, although they may decrease biochar particle size and enhance its dispersion in the soil. Elucidating the impacts of soil fauna directly and indirectly on biochar stability is a top research priority.

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European Journal of Soil Science

Tập 64 Số 4

379-390

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