退化喀斯特植被恢复对土壤微生物数量及群落功能多样性的影响

采集不同恢复阶段的土壤样品,采用微生物培养法研究了退化喀斯特植被恢复对土壤微生物数量、群落功能多样性的影响。研究结果表明随着退化喀斯特植被的恢复,土壤微生物数量增加,表现为乔木群落阶段灌木群落阶段草本群落阶段裸地阶段。土壤微生物群落代谢功能分析表明:植被恢复往往导致较高的平均颜色变化率、物种丰富度和功能多样性。乔木群落阶段的平均诱导底物利用率最高,明显地与其他3个恢复阶段不同。总之,植被恢复使得土壤微生物数量增加,碳源平均利用率增强。因此,创造了更好的土壤条件更有利于退化喀斯特植被的恢复。

Effects of degraded karst vegetation restoration on soil microbial amount and functional diversity

Soil samples were collected at different restoration stages in a study area. By using microbial incubation methods the effects of vegetation restoration of degraded karst on soil microbial amount and community functional diversity were studied. The results showed the amount of soil microbes increased with vegetation restoration in an order of arboreal community stage>shrubby community stage>herbaceous community stage>bare land stage. Themetabolic functional diversity of soil microbial community analyses indicated that vegetation restoration tended to result in higher average well color development, substrate richness and functional diversity. Average utilization of specific substrate guilds was highest in arboreal community stage. Arboreal community stage was significantly different from other three recovery stages. In conclusion, vegetation restoration improved the amount of soil microbes and utilization of carbon sources, thus created better soil conditions, which in turn were more conducive to vegetation restoration of degraded karst.