Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 21, Issue 3, Pages 380-386Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(08)62280-9
Keywords
Biolog; chlorpyrifos; community-level physiological profile; microbial functional diversity
Categories
Funding
- National M-Tech Research and Development Program (863) of China [2006AA06Z386, 2007AA06Z306]
- China Postdoctoral Science Foundation [20070421174]
- National Natural Science Foundation of China [30771254]
- Zhejiang Provincial Natural Science Foundation [Z306260]
- National Key Technologies R&D Program of China [2006BAI09B03]
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Degradation of chlorpyrifos at different concentrations in soil and its impact on soil microbial functional diversity were investigated under laboratory condition. The degradation half-live of chlorpyrifos at levels of 4, 8, and 12 mg/kg in soil were calculated to be 14.3, 16.7, and 18.0 d, respectively. The Biolog study showed that the average well color development (AWCD) in soils was significantly (P < 0.05) inhibited by chlorpyrifos within the first two weeks and thereafter recovered to a similar level as the control. A similar variation in the diversity indices (Simpson index 1/D and McIntosh index U) was observed, but no significant difference among the values of the Shannon-Wiener index H' was found in chlorpyrifos-treated soils. With an increasing chlorpyrifos concentration, the half-life of chlorpyrifos was significantly (P < 0.05) extended and its inhibitory effect on soil microorganisms was aggravated. It is concluded that chlorpyrifos residues in soil had a temporary or short-term inhibitory effect on soil microbial functional diversity.
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