黔中岩溶区不同土层厚度土壤碳、氮、磷含量及其转化酶的活性

Carbon,Nitrogen and Phosphorus Content and Invertase Activity in Soil with Different Soil Thickness in Karst Area of Central Guizhou

为了解喀斯特地区不同土层厚度下土壤营养元素的含量及转化过程,以不同土层厚度的土壤为对象,采用野外采样及室内分析方法,研究不同土层厚度土壤碳、氮、磷含量及其转化酶活性。结果表明:随着土层厚度的增加,喀斯特地区土壤有机碳含量逐渐增加,白云岩发育土壤有机碳含量差异较大;速效磷含量依次为中土>厚土>薄土,中土的速效磷含量最高;而碱解氮则在薄土中含量最高。随着土层厚度的增加,土壤中微生物量碳、氮、磷及其转化酶活性逐渐增加。

The carbon, nitrogen and phosphorus content and invertase activity of soil with different soil thickness were analyzed by flied sampling and indoor analysis to discuss the content and transformation process of nutrient elements of soil with different soil thickness in karst area. Results： Soil organic carbon content gradually increases with increase of soil thickness and there is an obvious difference in organic carbon content of soil developed from dolomite. The rapidly available phosphorus content of different soil thickness is moderate soil thickness ~ higher soil thickness 〉 lower soil thickness. The rapidly available phosphorus content of soil with moderate soil thickness is the highest but available nitrogen content of soil with lower soil thickness is the highest. Soil microbial biomass C, N, P and invertase activity increase with increase of soil thickness gradually.