矿化(土壤科学)
微生物种群生物学
环境化学
化学
土壤水分
有机质
微生物
微生物降解
动力学
生态学
生物
细菌
有机化学
遗传学
物理
量子力学
标识
DOI:10.1016/0038-0717(93)90069-n
摘要
We tried to assess the dynamic behaviour of the soil microbial community that degrades 2,4-dichlorophenoxyacetic acid (2,4-d) either by comparing the kinetics of mineralization of 14C-2,4-d applied at concentrations between 0.16 and 20 mg kg−1 or by determining the 2,4-d mineralization potential that develops in soils amended with the herbicide in the same range of concentrations. For that purpose a mixing procedure that allows determination of the rate of herbicide mineralization independently of its residual concentration was applied. Kinetics of mineralization of 14C-2,4-d revealed that in the soil at least two different microbial groups are responsible for the degradation of the herbicide. They probably differ in their tolerance to the bioactivity of the herbicide as well as their capacity to metabolize it. The time variations of the 2,4-D mineralization potential showed a delayed period of 2,4-d degradation that was attributed to a possible shift in the degrading species. Exhaustion of labile C-sources was thought to be responsible for the strengthening of the role of microorganisms currently living from the consumption of the more recalcitrant aromatic structures of the soil organic matter.
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