Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time / 浙江大学学报(英文版)(B辑:生物医学和生物技术)
Journal of Zhejiang University. Science. B
;
(12): 250-260, 2008.
Article
in English
| WPRIM
| ID: wpr-277277
ABSTRACT
Effects of cadmium (Cd) on microbial biomass, activity and community diversity were assessed in a representative variable charge soil (Typic Aquult) using an incubation study. Cadmium was added as Cd(NO3)(2) to reach a concentration range of 0-16 mg Cd/kg soil. Soil extractable Cd generally increased with Cd loading rate, but decreased with incubation time. Soil microbial biomass was enhanced at low Cd levels (0.5-1 mg/kg), but was inhibited consistently with increasing Cd rate. The ratio of microbial biomass C/N varied with Cd treatment levels, decreasing at low Cd rate (<0.7 mg/kg available Cd), but increasing progressively with Cd loading. Soil respiration was restrained at low Cd loading (<1 mg/kg), and enhanced at higher Cd levels. Soil microbial metabolic quotient (MMQ) was generally greater at high Cd loading (1-16 mg/kg). However, the MMQ is also affected by other factors. Cd contamination reduces species diversity of soil microbial communities and their ability to metabolize different C substrates. Soils with higher levels of Cd contamination showed decreases in indicator phospholipids fatty acids (PLFAs) for Gram-negative bacteria and actinomycetes, while the indicator PLFAs for Gram-positive bacteria and fungi increased with increasing levels of Cd contamination.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pharmacology
/
Phospholipids
/
Soil Microbiology
/
Time Factors
/
Cadmium
/
Carbon
/
Biomass
/
Microbial Viability
/
Fatty Acids
/
Metabolism
Language:
English
Journal:
Journal of Zhejiang University. Science. B
Year:
2008
Type:
Article
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