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Microbial properties of soil aggregates created by earthworms and other factors: spherical and prismatic soil aggregates from unreclaimed post-mining sites

机译:earth和其他因素造成的土壤团聚体的微生物特性:未开垦的采后地点的球形和棱柱形土壤团聚体

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Soil aggregates between 2 and 5 mm from 35- and 45-year-old unreclaimed post-mining sites near Sokolov (Czech Republic) were divided into two groups: spherical and prismatic. X-ray tomography indicated that prismatic aggregates consisted of fragments of claystone bonded together by amorphous clay and roots while spherical aggregates consisted of a clay matrix and organic fragments of various sizes. Prismatic aggregates were presumed to be formed by plant roots and physical processes during weathering of Tertiary mudstone, while earthworms were presumed to contribute to the formation of spherical aggregates. The effects of drying and rewetting and glucose addition on microbial respiration, microbial biomass, and counts of bacteria in these aggregates were determined. Spherical aggregates contained a greater percentage of C and N and a higher C-to-N ratio than prismatic ones. The C content of the particulate organic matter was also higher in the spherical than in the prismatic aggregates. Although spherical aggregates had a higher microbial respiration and biomass, the growth of microbial biomass in spherical aggregates was negatively correlated with initial microbial biomass, indicating competition between bacteria. Specific respiration was negatively correlated with microbial biomass. Direct counts of bacteria were higher in spherical than in prismatic aggregates. Bacterial numbers were more stable in the center than in the surface layers of the aggregates. Transmission electron microscopy indicated that bacteria often occurred as individual cells in prismatic aggregates but as small clusters of cells in spherical aggregates. Ratios of colony forming units (cultivatable bacteria) to direct counts were higher in spherical than in prismatic aggregates. Spherical aggregates also contained faster growing bacteria.
机译:来自Sokolov(捷克共和国)附近35岁和45岁未开垦的采后地点的2到5 mm的土壤聚集体分为两组:球形和棱柱形。 X射线断层扫描显示,棱柱状聚集体由通过无定形粘土和根部粘结在一起的黏土碎片组成,而球形聚集体由黏土基质和各种大小的有机碎片组成。据推测,棱柱状聚集体是在第三纪泥岩风化过程中由植物根系和物理过程形成的,而earth被认为是有助于球形聚集体形成的。确定了干燥,再湿润和添加葡萄糖对这些聚集体中微生物呼吸,微生物生物量以及细菌数量的影响。球形聚集体比棱柱形聚集体包含更高的C和N百分比,以及更高的C / N比。球形颗粒有机物的碳含量也高于棱柱状聚集体。尽管球形团聚体具有较高的微生物呼吸和生物量,但球形团聚体中微生物量的增长与初始微生物量呈负相关,表明细菌之间存在竞争。特定呼吸与微生物生物量负相关。球形细菌的直接计数高于棱柱聚集体。中心的细菌数量比聚集体的表面层更稳定。透射电子显微镜表明,细菌通常以棱柱状聚集体中的单个细胞出现,但以球形聚集体中的小细胞簇形式出现。球形菌落形成单位(可培养细菌)与直接计数的比率高于棱柱状聚集体。球形聚集体还包含生长较快的细菌。

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  • 来源
    《Folia Microbiologica》 |2011年第1期|p.36-43|共8页
  • 作者单位

    Biology Center of the Academy of Sciences of the Czech Republic, v.v.i. – Institute of Soil Biology, 370 05, České Budějovice, Czech Republic;

    Biology Center of the Academy of Sciences of the Czech Republic, v.v.i. – Institute of Soil Biology, 370 05, České Budějovice, Czech Republic;

    Department of Ecosystem Biology, South Bohemia University, 370 05, České Budějovice, Czech Republic;

    UGCT-Center for X-ray Tomography of Ghent University, 9000, Ghent, Belgium;

    Department of Geology and Soil Science, Ghent University, 9000, Ghent, Belgium;

    UGCT-Center for X-ray Tomography of Ghent University, 9000, Ghent, Belgium;

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