三株嗜盐古菌诱导形成白云石
发布时间：2019-06-12 02:35
【摘要】：白云石成因问题是地质学上长期悬而未决的难题之一.近年来,微生物诱导白云石沉淀逐渐成为白云石成因的重要理论之一,但其中微生物的作用机理远未探明.现生白云石主要分布于高盐环境,该环境中的优势菌群为嗜盐菌,包括嗜盐细菌和嗜盐古菌.因而此次选取三株嗜盐古菌Natrinema sp.J7-1、Natrinema sp.J7-3和Natrinema sp.LJ7,研究其诱导白云石沉淀的能力,并对比不同细胞浓度对白云石沉淀的影响,以期更深入地了解微生物在白云石形成中的作用.通过X射线衍射(XRD)检测沉淀物的物相,利用扫描电子显微镜(SEM)观察所得矿物形态,同时辅以能量色散谱分析(EDS)分析矿物的元素组成.实验结果表明三株嗜盐古菌皆可诱导球型、哑铃型、花椰菜型以及球形聚集体等白云石的形成,且在较高细胞浓度下诱导形成的矿物中白云石含量增多.分析表明细胞浓度的增加会导致细胞表面羧基含量的增加,从而为白云石的沉淀提供更多的成核位点,有利于Mg进入矿物晶格,从而诱导白云石沉淀,本结果进一步提高了对微生物白云石成因机理的认识.
[Abstract]:The genesis of dolomite is one of the outstanding geological problems for a long time. In recent years, microbial induced dolomite precipitation has gradually become one of the important theories of dolomite genesis, but the mechanism of microbial action is far from clear. The present dolomite is mainly distributed in high salt environment, and the dominant flora in this environment is halophilic bacteria, including halophilic bacteria and halophilic archaea. Therefore, three strains of halophilic archaea Natrinema sp.J7-1,Natrinema sp.J7-3 and Natrinema sp.LJ7, were selected to study their ability to induce dolomite precipitation, and the effects of different cell concentrations on dolomite precipitation were compared in order to understand the role of microorganisms in dolomite formation. The phase of precipitates was detected by X-ray diffraction (XRD), and the mineral morphology was observed by scanning electron microscope (SEM). At the same time, the elemental composition of minerals was analyzed by energy dispersion spectroscopy (EDS). The results showed that all three halophilic archaea could induce the formation of dolomite such as ball type, dumbbell type, cauliflower type and spherical aggregate, and the content of dolomite in the minerals induced by high cell concentration increased. The analysis shows that the increase of cell concentration will lead to the increase of carboxy content on the cell surface, thus providing more nucleation sites for dolomite precipitation, which is beneficial for Mg to enter the mineral lattice and induce dolomite precipitation. This result further improves the understanding of the genetic mechanism of microbial dolomite.
【作者单位】： 中国地质大学生物地质与环境地质国家重点实验室;中国地质大学环境学院;
【基金】：国家自然科学基金项目(Nos.41502317,41572323,41130207)
【分类号】：P571
本文编号：2497653
[Abstract]:The genesis of dolomite is one of the outstanding geological problems for a long time. In recent years, microbial induced dolomite precipitation has gradually become one of the important theories of dolomite genesis, but the mechanism of microbial action is far from clear. The present dolomite is mainly distributed in high salt environment, and the dominant flora in this environment is halophilic bacteria, including halophilic bacteria and halophilic archaea. Therefore, three strains of halophilic archaea Natrinema sp.J7-1,Natrinema sp.J7-3 and Natrinema sp.LJ7, were selected to study their ability to induce dolomite precipitation, and the effects of different cell concentrations on dolomite precipitation were compared in order to understand the role of microorganisms in dolomite formation. The phase of precipitates was detected by X-ray diffraction (XRD), and the mineral morphology was observed by scanning electron microscope (SEM). At the same time, the elemental composition of minerals was analyzed by energy dispersion spectroscopy (EDS). The results showed that all three halophilic archaea could induce the formation of dolomite such as ball type, dumbbell type, cauliflower type and spherical aggregate, and the content of dolomite in the minerals induced by high cell concentration increased. The analysis shows that the increase of cell concentration will lead to the increase of carboxy content on the cell surface, thus providing more nucleation sites for dolomite precipitation, which is beneficial for Mg to enter the mineral lattice and induce dolomite precipitation. This result further improves the understanding of the genetic mechanism of microbial dolomite.
【作者单位】： 中国地质大学生物地质与环境地质国家重点实验室;中国地质大学环境学院;
【基金】：国家自然科学基金项目(Nos.41502317,41572323,41130207)
【分类号】：P571
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