Competitive biodegradation of dichlobenil and atrazine coexisting in soil amended with a char and citrate.
The role of char nutrients in the biodegradation of coexisting dichlobenil and atrazine in a soil by their respective bacterial degraders, DDN and ADP, was evaluated. Under growing conditions, their degradation in soil extract was slow with <40% and <20% degraded within 64 h, respectively. The degradation in extracts and slurries of char-amended solids increased with increasing char content, due to nutritional stimulation on microbial activities. By supplementing soil extract with various major nutrients, the measured degradation demonstrated that P was the exclusive limiting nutrient. The reduction in the degradation of coexisting dichlobenil and atrazine resulted apparently from the competitive utilization of P by DDN and ADP. With a shorter lag phase, ADP commenced growing earlier than DDN with the advantage of utilizing P first in insufficient supply. This resulted in an inhibition on the growth of DDN and thus suppression on dichlobenil degradation.
Qiu
Yuping
Y
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, China.
Pang
Hui
H
Zhou
Zunlong
Z
Zhang
Ping
P
Feng
Yucheng
Y
Sheng
G Daniel
GD
D001280:Atrazine / Q000378:metabolism*; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002606:Charcoal / Q000737:chemistry; D002951:Citrates / Q000737:chemistry; D006540:Herbicides / Q000378:metabolism; D009570:Nitriles / Q000378:metabolism*; D012987:Soil / Q000032:analysis; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D013045:Species Specificity; D014908:Triticum / Q000737:chemistry
D002951:Citrates; D006540:Herbicides; D009570:Nitriles; D012987:Soil; D012989:Soil Pollutants; D002606:Charcoal; C055869:dichlobanil; D001280:Atrazine