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Title of Journal: J Soils Sediments

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Abbravation: Journal of Soils and Sediments

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Springer Berlin Heidelberg

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DOI

10.1002/chin.200548143

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1614-7480

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Effect of biochar addition on C mineralisation and

Authors: Christophe Naisse Cyril Girardin Bernard Davasse Abad Chabbi Cornelia Rumpel
Publish Date: 2014/11/06
Volume: 15, Issue: 4, Pages: 825-832
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Abstract

The impact of biochar on subsoil organic carbon mineralisation has never been assessed despite its susceptibility to downward transport after soil amendment In this study we analysed the potential mineralisation of biochar and plant material as well as their effect on native soil organic matter SOM decomposition in subsoil horizonsWe used 13Clabelled biochar and plant material to allow disentangling substrate mineralisation and priming effects The substrates were added to two mountain subsoils under different land use and incubated for 1 year under optimum conditions We analysed for physical parameters and C mineralisation in the two soils Moreover microbial communities were assessed by phospholipid fatty acid PLFA analysesOur results indicated contrasting potential C mineralisation of subsoils under different land use probably related to sampling depth contribution of stabilised organic matter compounds carbon content as well as quality In general very low proportions of biochar were mineralised in the two soils as compared to plant material The mineralisation of each of the added substrates biochar and plant material was slightly but significantly different in the two soils Native C mineralisation was much higher after plant material addition than after biochar addition Subsoil type influenced the kind and magnitude of priming effects for both added substratesBiochar mineralisation and its priming effects in subsoil are small as compared to uncharred plant litter We suggest that substrate mineralization and priming effects induced on subsoil organic matter are dependent on the composition of the added substrate as well as soil parameters rather than microbial community characteristicsOur research was funded by the European Community under the framework of the EuroChar project FP7ENV478 2010ID265179 We thank the Observatoire HommeMilieux Pyrenees HautVicdessos CNRSINEE for access to the sampling sites and the Poznan radiocarbon laboratory for the 14C activity analyses

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