Impacts of Aluminum and Cadmium Pollution on Latosol Soil Microbial and Soil Respiration

A pot experiment was conducted to study the impacts of aluminum(Al) and cadmium(Cd) pollution on the soil microbes and soil respiration. The results indicated that the pollution effects of Al and Cd on the biochemistry processes were different, The lower concentration of Al, ≤100 mg/kg and ≤50 mg/kg could promote the growth of bacteria and actinomycete, but the higher concentrations of Al could reducd bacteria and actinomycetes number. The number of fungi was gradually reducing with the increasing of the concentration of Al.While, the influence degree of Cd on the soil microbe and soil respiration was weaker than that of Al. The influence of Cd on bacteria fluctuated very much, and the Cd under the concentration of 5-100 mg/kg promoted the fungi growth, and inhibited the growth of the actinomycetes. The Al inhibition on the soil respiration was according to the concentration of Al. However, the influence of Cd on soil respiration was less than that of Al.Synergistic effect on the population of bacteria and fungi under the compound pollution of Al and Cd, and antagonistic effect on the population of actinomycete.