铝和镉污染对砖红壤土壤微生物及土壤呼吸的影响

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

通过室内模拟土壤盆栽试验,研究铝、镉对砖红壤土壤微生物及土壤呼吸的影响。结果表明：铝和镉对土壤生化过程有不同的效应。铝浓度≤100 mg/kg和≤50 mg/kg分别对细菌和放线菌有一定促进作用,高浓度则产生抑制作用,土壤真菌数量随土壤铝浓度的增加而逐渐减少。而镉对土壤微生物及土壤呼吸作用的影响比铝小。镉对细菌生长影响波动幅度大,镉浓度在5~100 mg/kg时,对真菌生长有促进作用,而抑制放线菌的生长。铝对土壤呼吸作用抑制效果随铝处理浓度增加而增加,而不同镉处理浓度对土壤呼吸作用影响较铝的作用小。铝镉复合污染对土壤细菌和真菌的影响表现出协同效应,对土壤放线菌的影响表现出拮抗效应。

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.