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Title:   Author  item
                                            Bolster, Carlitem
                                            ABIT, SERGIO - Oklahoma State Universityitem
                                            Cantrell, Keriitem
                                            QUIJANO, JESSAMINE - University Of Californiaitem
                                            WALKER, SHARON - University Of California
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 6/12/2014
                                    Publication  Date: 10/7/2014
                                    Citation: Bolster, C.H., Abit, S., Cantrell, K.B., Quijano, J., Walker, S. 2014. Factors affecting transport of bacteria and microspheres through biochar-amended soils. Meeting Abstract. Abstract.Interpretive Summary:
                                Technical Abstract: We have investigated the role of biochar feedstock type (poultry litter extract and pine chips), biochar pyrolysis temperature (350 and 700 oC), biochar application rate (1, 2, and 10%), soil moisture content (saturated and 50% saturation), soil texture (1 and 12 % clay content), and surface properties on the transport of bacteria and microspheres through biochar-amended soils. Under most conditions we found that biochar addition to soils could significantly reduce bacterial and microsphere transport – in some cases up to five-orders-of-magnitude reduction in transport was observed. In general pine chip biochars were much more effective than poultry litter biochars at increasing microbial retention in our columns. Indeed, in some cases we observed an increase in microbial transport following addition of poultry litter biochars. High temperature biochars were generally more effective at increasing microbial retention in soils than low temperature biochars. Biochar addition to soils was observed to be more effective in partially saturated soils than fully saturated soils. We also found that bacteria with contrasting surface properties responded to biochar additions differently. Our results show that the addition of biochar can affect the retention and transport behavior of bacteria and that biochar application rate, biochar feedstock source, biochar pyrolysis temperature, soil moisture content, soil texture, and bacterial surface characteristics were all important factors determining the transport of bacteria through soil. Our results also suggest that the interactions between biochar and bacteria are complicated and need further investigations to determine the mechanisms involved.


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