镉芘单-污染和复合污染对土壤微生物生态效应的影响

以土壤微生物数量和酶活性为指标,通过室内模拟试验,分别研究了镉芘单一和复合污染条件下对土壤微生物的生态效应。结果表明,镉-芘复合污染对细菌数量具有协同抑制作用,而对真菌和放线菌数量具有拮抗抑制作用;镉单一污染及镉-芘复合污染对土壤微生物数量的抑制率大小依次为:放线菌>细菌>真菌,而芘单一污染为:放线菌>真菌>细菌。镉-芘复合污染对土壤蔗糖酶、脲酶、脱氢酶、多酚氧化酶均具有协同抑制作用,抑制率大小依次为脱氢酶>多酚氧化酶>蔗糖酶>脲酶。

Eco-toxicological Effect of Cadium and Pyrene Combined and Simplex Pollution on Soil Microbe

The effects of cadmium and pyrene combined and simplex pollution on soil enzyme activities (sucrase, urease, dehydrogenase, polyphenol oxidase) and microbial population were studied by simulative experiment. The results showed that there existed synergistic inhibiting effect on the population of soil bacterium, sucrase, urease, dehydrogenase and polyphenol oxidase activities, and antagonistic inhibiting effect on the population of fungi and actinomyces under the compound pollution of cadmium and pyrene. The order of inhibiting rate of soil microbial population under cadmium simplex pollution and the compound pollution of cadmium and pyrene were proved to be: actinomyces>bacteria>fungi, while, the order under pyrene simplex pollution was actinomyces>fungi>bacteria. The order of inhibiting rate of soil enzyme activities under the combined pollution of cadmium and pyrene were proved be: dehydrogenase>polyphenol oxidase> sucrase>urease.