[Effects of Bacillus mucilaginosus on the Cd content of rhizosphere soil and enzymes in soil of Brassica juncea].
The effects of two inoculation concentrations of Bacillus mucilaginosus (1 x 10(10) (treatment A), 2 x 10(10) (treatment C) CFU x kg(-1)) on the Cd content of rhizosphere soil and enzymes in soil were investigated when Brassica as a hyperaccumulator grew in the pots experiment. The results showed that the removal rate of rhizosphere soil Cd in treatment A and C were 37.62% and 38.27%, respectively, which were 1.54 and 1.56 times as high as that of the control (24.47%). The activities of urease, phosphatase and catalase in rhizosphere were higher than those in non-rhizosphere. The urease, catalase and dehydrogenase activities increased firstly and then decreased, while the phosphatase activity increased gradually with time. However, the dehydrogenase activity in non-rhizophere was higher than that in rhizosphere. Correlation analysis showed negative correlation between content of Cd and urease and phosphatase in the control treatment and significantly negative correlation between content of Cd and activities urease and phosphatase in treatment A and C in rhizosphere. The results indicated that inoculation of Bacillus mucilaginosus not only had some positive effect on urease, phosphatase, catalase and dehydrogenase in soil but also improved the purification effect of hyperaccumulator on soil Cd. This study provides theoretical guidance for the further mechanism study of Microbe-Phytoremediation.
College of Resources & Environmental Science, Agricultural University of Hebei, Baoding 071001, China. yangrong2011@163.com
Rong
R
Yang
Bo-Wen
BW
Li
Wei
W
Liu
D001407:Bacillus / Q000145:classification / Q000378:metabolism* / Q000502:physiology; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000302:isolation & purification* / Q000378:metabolism; D052918:Environmental Restoration and Remediation / Q000379:methods*; D009149:Mustard Plant / Q000235:genetics / Q000378:metabolism*; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D058441:Rhizosphere; D012989:Soil Pollutants / Q000302:isolation & purification* / Q000378:metabolism; D014510:Urease / Q000378:metabolism
D012989:Soil Pollutants; D002104:Cadmium; D010744:Phosphoric Monoester Hydrolases; D014510:Urease