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

摘要: Soil aggregates between 2 and 5 mm from 35- 45-year-old unreclaimed post-mining sites near Sokolov (Czech Republic) were divided into two groups: spherical prismatic. X-ray tomography indicated that prismatic consisted of fragments claystone bonded together by amorphous clay roots while a matrix organic various sizes. Prismatic presumed to be formed plant physical processes during weathering Tertiary mudstone, earthworms contribute the formation aggregates. The effects drying rewetting glucose addition on microbial respiration, biomass, counts bacteria in these determined. Spherical contained greater percentage C N higher C-to-N ratio than ones. content particulate matter was also Although had respiration growth biomass negatively correlated with initial indicating competition bacteria. Specific biomass. Direct Bacterial numbers more stable center surface layers Transmission electron microscopy often occurred as individual cells but small clusters Ratios colony forming units (cultivatable bacteria) direct faster growing