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UID:20250815T193314EDT-0389guHrc8@132.216.98.100
DTSTAMP:20250815T233314Z
DESCRIPTION:PhD Oral Defence of Franziska Srocke\, Plant Science\n\nThis Ph
 .D. project investigated the use of wood-derived biochars as carriers for 
 bacterial inoculants for bioaugmentation of petroleum hydrocarbon-contamin
 ated soil. Biochar is a carbonaceous solid produced by pyrolysis of biomas
 s and has a highly porous structure suitable for microbial attachment. Usi
 ng synchrotron X-ray microtomography and multifractal analysis\, we demons
 trated that the internal structure of softwood pellet biochars consisted o
 f a highly connected\, homogenous and isotropic network of pores. Furtherm
 ore\, the diversity\, structure and dynamics of a biochar-immobilized comm
 unity of hydrocarbon-degrading bacteria was assessed using 16S rRNA gene s
 equencing. The results showed that biochar properties can cause a signific
 ant shift in biochar-associated communities. Biochar particle size also af
 fected community structures (alpha and beta diversity) over time. A soil m
 icrocosm experiment revealed that neither biochar amendment nor inoculatio
 n with a hydrocarbon-degrading Rhodococcus sp. enhanced the dissipation of
  petroleum hydrocarbons compared to the control soil after 70 days. Howeve
 r\, biochar significantly increased alpha diversity in soil communities\, 
 and some biochars caused significant shifts in community composition. Bact
 erial assemblages on the biochar particles were enriched in Xanthomonadace
 ae\, Flavobacteriaceae and Sphingobacteriaceae\, and had higher proportion
 s of Rhodococcus\, suggesting that the inoculant persisted on biochar surf
 aces. This work contributed novel insights into biochar effects on soil mi
 crobial communities in contaminated soil. Although these effects did not l
 ead to an improved hydrocarbon degradation\, the findings provided evidenc
 e that biochars may be used for the purpose of stimulating specific microb
 ial taxa.\n\nEveryone in the 9IÖÆ×÷³§Ãâ·Ñ community is welcome to attend a PhD O
 ral Defence. Please join us in celebrating the accomplishments of our PhD 
 candidates.\n
DTSTART:20200108T141500Z
DTEND:20200108T141500Z
LOCATION:MS2-022\, Macdonald-Stewart Building\, CA\, QC\, St Anne de Bellev
 ue\, H9X 3V9\, 21111 Lakeshore Road
SUMMARY:PhD Oral Defence: Biochar impacts on soil microbiota and potential 
 application of biochar  as an inoculant carrier for bioremediation of petr
 oleum hydrocarbon contaminated soil
URL:/macdonald/channels/event/phd-oral-defence-biochar
 -impacts-soil-microbiota-and-potential-application-biochar-inoculant-carri
 er-303834
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