【摘要】 为了探讨流域岩溶生态系统土壤碳酸酐酶(CA)活性、有机碳含量及CA固碳之间的潜在关系,选取长江流域干流及支流沿岸不同地质生态环境下的10个样地,比较长江流域不同地质生态环境下表层土壤(0~20cm)中的碳酸酐酶(CA)活性与土壤有机碳(SOC)含量,并分析二者之间的关系。结果表明:(1)长江流域岩溶区的表层土壤CA活性要高于非岩溶区(P<0.01),土壤CA活性的差异与样地的地质类型及植被类型不同有关;(2)位于岩溶区高场(GC)样地的年平均SOC含量最高(1.09%),而位于非岩溶区外洲(WZ)样地的年平均SOC含量最低(0.29%),而且总体比较而言,长江流域冬季表层土壤的平均SOC含量显著高于夏季(P<0.01);(3)相关性分析结果显示,不同季节长江流域岩溶区表层土壤CA活性与SOC含量呈一定的正相关。研究结果为进一步研究流域岩溶生态系统土壤CA与土壤固碳能力之间的关系奠定了基础。更多还原

【Abstract】 Ten sampling plots in different geological eco-environments were selected along the main stream and tributaries of the Changjiang River basin.Carbonic Anhydrase(CA)activity and Soil Organic Carbon(SOC)content in surface soils(0~20cm)were studied and relationships between CA activity and SOC content were discussed.The results were as follows.(1)The CA activities in surface soils of karst areas were higher than those in non-karst areas(P<0.01).Different geological types and vegetation types resulted in different CA activities.(2)The plot GC in karst areas had the highest annual average SOC content(1.09%)while the plot WZ in non-karst area had the lowest annual average SOC content(0.29%).Moreover,the average surface SOC content in winter was significantly higher than that in summer(P<0.01).(3)Correlation analysis showed that CA activities in karst surface soils correlated positively with SOC contents in all seasons.The result of this paper lays a foundation for further studies on the role of soil CA in carbon sequestration in karst ecosystems of river basins.更多还原