铬耐性菌对土壤中六价铬的还原作用

发布时间：2018-05-15 10:08

本文选题：六价铬 + 铬耐性菌　；参考：《中国环境科学》2017年03期

【摘要】：选择7种全国性典型土壤(黄壤、红壤、石灰性紫色土、青紫泥、黑土、砖红壤和潮土),研究微生物群落对铬胁迫的响应以及土著铬耐性菌对土壤中六价铬的还原作用.结果表明,在重金属铬的胁迫作用下,铬耐性菌成为土壤中的优势菌群,在黄壤、红壤、石灰性紫色土、青紫泥、黑土、砖红壤和潮土中丰度依次为75.2%、89.9%、77.3%、65.3%、72.8%、65.4%、92.8%,并在六价铬还原过程中发挥了重要的作用,7种土壤中微生物对六价铬还原的贡献率分别为14.4%、44.0%、20.6%、34.9%、21.9%、21.7%、22.0%.微生物对六价铬还原的贡献率主要受土壤中亚铁含量和颗粒组成影响.采用PCR-DGGE-克隆测序技术鉴定了这7种土壤中铬耐性菌的种类,主要为芽孢杆菌(Bacillus sp.)、埃希氏菌(Escherichia sp.)、异常球菌(Deinococcus sp.)、小单胞菌(Micromonospora sp.)、甲基杆菌(Methylobacterium sp.)、马赛菌(Massilia sp.)、酸杆菌(Acidobacterium sp.)、丛毛单胞菌(Comamonas sp.)、慢生根瘤菌(Bradyrhizobium sp.)和节杆菌(Arthrobacter sp.).
[Abstract]:Seven national typical soils (yellow soil, red soil, calcareous purple soil, bluish mud, black soil, latosol and tidal soil) were selected to study the response of microbial communities to chromium stress and the reduction of hexavalent chromium in soils by native chromium tolerant bacteria. The results showed that, under the stress of heavy metal chromium, chromium-tolerant bacteria became the dominant flora in soil, such as yellow soil, red soil, calcareous purple soil, bluish mud and black soil. The abundance in lateritic soil and aquic soil was 75.2and 89.9in turn, and 75.33.72.8and 72.80.65.4and 92.8, respectively, and played an important role in the reduction of hexavalent chromium. The contribution rate of microbes to the reduction of hexavalent chromium in seven soils was 14.44.020.20.634.934. 9and 21.92.7.The contribution rate of microorganisms to hexavalent chromium reduction was 14.44.00.20.634.9and 21.95.90.The percentage of microbes contributing to the reduction of hexavalent chromium was 14.44.020.634.9and 21.92.7. The contribution of microorganisms to hexavalent chromium reduction was mainly affected by the Fe content and particle composition of soil. Using PCR-DGGE-clone sequencing technique, the species of chromium-tolerant bacteria in these seven kinds of soils were identified. Mainly Bacillus sp., Escherichia sp., Deinococcus sp., Micromonospora sp., Methylobacterium sp., Massilia sp., Acidobacterium sp., Comamonas sp., Bradyrhizobium sp.) And Arthrobacter sp.
【作者单位】：浙江省农业科学院农产品质量标准研究所;
【基金】：浙江省农业科学院青年人才培养项目资助
【分类号】：X172;X53

【相似文献】