【摘要】 基于野外调查采样和室内分析,研究辽河保护区3种土壤类型(草甸土、潮土和沼泽土)、4种土地利用方式(旱田、水田、林地和草地)下土壤总有机碳、溶解性有机碳和微生物生物量碳的含量特征。结果表明,辽河保护区不同土地利用方式下土壤的总有机碳、溶解性有机碳和微生物生物量碳含量差异显著(P<0.05),旱田和水田土壤的总有机碳和微生物生物量碳含量均显著高于林地和草地的,草地土壤溶解性有机碳含量显著高于旱田、水田和林地的。草甸土不同土地利用方式下土壤的总有机碳含量、溶解性有机碳含量和微生物生物量碳含量均随剖面深度(0~60 cm)的增加呈逐渐降低的趋势。相关性分析结果表明,土壤总有机碳含量与微生物生物量碳含量呈极显著正相关(P<0.01),二者与土壤溶解性有机碳含量的相关性无统计学意义。结果表明土地利用方式的改变将影响到辽河流域土壤有机碳的存在形态和含量。更多还原

【Abstract】 Field investigations and lab experiments were carried out to study characteristics of soil total organic carbon(TOC), dissolved organic carbon(DOC) and microbial biomass carbon(MBC) in reserve of Liaohe River. Three soil types(including meadow soil, moisture soil and boggy soil) and four land use patterns(including cropland, paddy land, forestland and grassland) were included in this study. Significant differences in TOC, DOC and MBC concentrations were observed among different land use patterns(P<0.05). The average concentrations of TOC and MBC were much higher in the cropland and paddy land than those in forestland and grassland. However, the DOC was the highest in the grassland among all land uses. In the meadow soil, the average concentrations of TOC, DOC and MBC presented a gradual reduction trend with depth increase. According to Pearson correlation analysis, the concentrations of TOC showed a significant positive relationship with that of MBC(P<0.01), while there were no significant correlation among TOC, MBC and DOC. The results showed that land use change could significantly affect the quantity and quality of soil carbon pools in this research zone.更多还原