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以广西典型峰丛洼地草地和原生林深层土壤(70～100cm)为对象,利用微生物交叉接种培养试验,研究不同土地利用类型、土壤微生物群落和通气条件对深层土壤有机碳矿化的影响。在124d的培养期内,微生物接种改变了0～28d原生林和0～81d草地深层土壤有机碳矿化速率,而通气条件变化对这一过程没有明显影响。3因素方差分析结果显示,深层土壤有机碳累积矿化率受土地利用类型、微生物群落和通气条件的影响显著(P<0.01),且存在3因素间交互效应。研究结果对于深入认识喀斯特深层土壤有机碳稳定机制和评估碳储量及其周转具有重要意义。
In order to study the effects of different land use types, soil microbial communities and aeration conditions on the mineralization of soil organic carbon in the typical grassland and grassland deep furrows (70 ~ 100cm) in Guangxi, China, cross-inoculation culture experiments were conducted. Microbial inoculation changed soil organic carbon mineralization rate in 0 ~ 28d primary forest and 0 ~ 81d grassland during the 124d incubation period, while the change of aeration condition had no obvious effect on this process. The result of ANOVA showed that the accumulative mineralization rate of soil organic C in deep soil was significantly affected by land use type, microbial community and aeration conditions (P <0.01), and there were three interaction effects. The results of this study are of great significance for understanding the mechanism of deep soil organic carbon stability in karst and assessing carbon storage and its turnover.