Effects of combination of plant and microorganism on degradationof simazine in soil
LIAO Min , XIE Xiaomei
DOI:
Received April 20, 2007,Revised July 19, 2007, Accepted , Available online
Volume 20,2008,Pages 195-198
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The degradative characteristics of simazine (SIM), microbial biomass carbon, plate counts of heterotrophic bacteria and most
probably number (MPN) of SIM degraders in uninoculated non-rhizosphere soil, uninoculated rhizosphere soil, inoculated nonrhizosphere
soil, and inoculated rhizosphere soil were measured. At the initial concentration of 20 mg SIM/kg soil, the half-lives
of SIM in the four treated soils were measured to be 73.0, 52.9, 16.9, and 7.8 d, respectively, and corresponding kinetic data fitted firstorder
kinetics. The experimental results indicated that higher degradation rates of SIM were observed in rhizosphere soils, especially
in inoculated rhizosphere soil. The degradative characteristics of SIM were closely related to microbial process. Vegetation could
enhance the magnitude of rhizosphere microbial communities, microbial biomass content, and heterotrophic bacterial community, but
did little to influence those community components responsible for SIM degradation. This suggested that rhizosphere soil inoculated
with microorganisms-degrading target herbicides was a useful pathway to achieve rapid degradation of the herbicides in soil.
