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SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
卷 69, 期 4, 页码 1069-1077出版社
SOIL SCI SOC AMER
DOI: 10.2136/sssaj2004.0271
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The early years of soil genesis during mine spoil reclamation are critical for vegetative establishment and may help predict reclamation success. Mine spoils in the Halle-Leipzig region of Germany were analyzed for microbial changes following a hay mulch-seeding treatment without topsoil or fertilizer application. Microbial biomass carbon (C-mic) and dehydrogenase activity (DHA) of spoils were measured each year in the first 3 yr after treatment. In the third year, bacterial community DNA fingerprints were compared with those from a reference soil. Microbial indicators were measured at three depths in the upper 10 cm of spoils at three sites with contrasting parent materials: glacial till (sandy loam), limnic tertiary sediments (high-lignite sandy clay loam), and quaternary sand and gravel (loamy sand). Before reclamation, C-mic means and standard deviations of surface spoils (0-1 cm) were 9 +/- 6, 39 +/- 11, and 38 +/- 16 mg kg(-1) for the loamy sand, high-lignite sandy clay loam, and sandy loam spoils, respectively. Within one year, mean C-mic at the surface increased to 148 +/- 70, 229 +/- 64, and 497 +/- 167 mg kg(-1), respectively, and was significantly higher at 0 to 1 cm than at lower depths. Highest DHA and DNA yields were obtained in the 0- to 1-cm depth of the sandy loam spoils. Microbial biomass C values exhibited significant correlations with DHA, DNA yield, and extractable C for all three mine spoils. Soil microbial indices were more responsive than plant measurements to differences in parent materials.
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