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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。
In order to discuss the potential of soil carbonic anhydrase (CA) activity, organic carbon content and carbon sequestration in the karst ecosystem of the river basin, 10 sample plots in different geo-ecological environments along the mainstream of the Yangtze River and the tributaries were selected to compare the differences in the Yangtze River Basin The activities of carbonic anhydrase (CA) and soil organic carbon (SOC) in the surface soil (0 ~ 20cm) under the geo-ecological environment were analyzed. The results showed as follows: (1) The CA activity of surface soil in the karst area of the Yangtze River was higher than that in the non-karst area (P <0.01), and the difference of soil CA activity was related to the geological type and vegetation types of the sample. (2) The average annual SOC content of the GC samples was the highest (1.09%), while that of the WZ samples located in the non-karst regions was the lowest (0.29%). In general, the winter in the Yangtze River Basin The average SOC content of surface soil was significantly higher than that of summer (P <0.01). (3) The correlation analysis showed that there was a positive correlation between CA activity and SOC content of surface soil in the karst area in different seasons. The results laid the foundation for further study on the relationship between soil CA and soil carbon sequestration in the karst ecosystem.