Decreased soil microbial biomass and nitrogen mineralisation with Eucalyptus biochar addition to a coarse textured soil
Journal Title: | Plant and soil 2012-01-01, Vol.354 (1-2), p.311-324 |
Main Author: | Dempster, D. N |
Other Authors: | Gleeson, D. B , Solaiman, Z. M , Jones, D. L , Murphy, D. V |
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English |
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Publisher: | Dordrecht: Springer |
ID: | ISSN: 0032-079X |
Link: | http://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=25844851 |
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recordid: | cdi_proquest_miscellaneous_1014105545 |
title: | Decreased soil microbial biomass and nitrogen mineralisation with Eucalyptus biochar addition to a coarse textured soil |
format: | Article |
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ispartof: | Plant and soil, 2012-01-01, Vol.354 (1-2), p.311-324 |
description: | Background and Aims Biochar has been shown to aid soil fertility and crop production in some circumstances. We investigated effects of the addition of Jarrah (Eucalyptus marginata) biochar to a coarse textured soil on soil carbon and nitrogen dynamics. Methods Wheat was grown for 10 weeks, in soil treated with biochar (0, 5, or 25 t ha−1) in full factorial combination with nitrogen (N) treatments (organic N, inorganic N, or control). Samples were analysed for plant biomass, soil microbial biomass carbon (MBC) and nitrogen (MBN), N mineralisation, CO2 evolution, community level physiological profiles (CLPP) and ammonia oxidising bacterial community structure. Results MBC significantly decreased with biochar addition while MBN was unaltered. Net N mineralisation was highest in control soil and significantly decreased with increasing addition of biochar. These findings could not be attributed to sorption of inorganic N to biochar. CO2 evolution decreased with 5 t ha−1 biochar but not 25 t ha−1. Biochar addition at 25 t ha−1 changed the CLPP, while the ammonia oxidising bacterial community structure changed only when biochar was added with a N source. Conclusion We conclude that the activity of the microbial community decreased in the presence of biochar, through decreased soil organic matter decomposition and N mineralisation which may have been caused by the decreased MBC. |
language: | eng |
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identifier: | ISSN: 0032-079X |
fulltext: | no_fulltext |
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