稀土元素钇对土壤微生物活性的影响  

Effect of Yttrium on Activity of Microbes in Soil

作　　者：陈小攀[1] 冯秀娟[1] 孙峰[1] 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000

出　　处：《环境科学与技术》2013年第8期41-44,64,共5页Environmental Science & Technology

基　　金：国家自然科学基金项目资助(21067003);江西省自然基金项目(20114BAB203024)

摘　　要：通过室内培养实验研究了稀土元素钇对土壤中细菌、真菌、放线菌三大微生物数量和土壤酶活性的影响。结果表明:在低浓度的情况下,钇对细菌、真菌、放线菌均表现为刺激作用,最大刺激率,细菌为16.8%,真菌为31.1%,放线菌为41.8%,在高浓度下表现为抑制作用,外源稀土对三大微生物起抑制作用的临界浓度分别为1 000 mg/kg、500 mg/kg、500 mg/kg。而在土壤酶活方面,钇对过氧化氢酶的作用只表现为抑制作用,并且在低浓度时下降的更为显著;钇对蛋白酶活性的影响表现为低浓度促进,最大刺激率达到了54.8%,而在高浓度抑制,最大抑制率为23.3%,且产生抑制作用的临界浓度为1 000 mg/kg;而钇对脲酶的影响不是很明显。因此微生物指标可以用作稀土环境风险的判断指标。Lab experiments were conducted in a research on effects of Yttrium （Y） on activity of soil microbes such as soil bacteria, fungi and actinomyces in terms of number of microbes and enzyme activity. It was found that there existed obvious stimulative effects by Y of low concentrations on bacteria, fungi and actinomyces, and the maximum stimulation rate of bacteria was 16.8%, of fungi 32.1%, and of actinomyces 41.8%, while Y of high concentration inhibited activity of microbes. In respect of enzyme activity in soil, Y caused inhibitory effect on catalase, at the same time stimulative effect on protease at low concentration, no significant effect was showed on urease. In conclusion, microbial indicators could be used as an index for judging the environmental risk of rare earth, for instance Y.

关 键 词：稀土 钇 土壤 微生物 酶活性 

分 类 号：X172[环境科学与工程—环境科学]