免耕稻草覆盖种植红薯对稻田土壤碳库及微生物数量的影响

Effects of no-tillage and straw covering for sweet potato on paddy soil carbon pool and quantity of soil microorganism

以传统栽培为对照,探讨免耕稻草覆盖种植红薯对土壤总有机碳、活性有机碳、碳库以及微生物数量的影响。结果表明,免耕稻草覆盖能提高0～10 cm耕层土壤的总有机碳、活性有机碳含量及各项碳库指数,而对10～20 cm土层的影响不明显;免耕稻草覆盖0～10 cm、10～20 cm土层的细菌、真菌、放线菌数量均明显高于传统栽培,说明免耕稻草覆盖可以提高土壤微生物的数量。生产上长期采用免耕稻草覆盖栽培措施,将更有利于提高土壤活性有机碳含量,改善土壤微生物生存环境,培肥土壤。

The present experiment was conducted to analyze the effect of no-tillage and straw covering for sweet potato on the soil total organic carbon content, active organic carbon, carbon pool and the quantity of microorganism using conventional cultivation as the control. The results indicated that the no-tillage cultivation with straw covering enhanced the total organic carbon and active organic carbon contents and the carbon pool indices in 0-10cm depth of soil layer, while it had no significant effects on 10-20 cm depth of soil layer. It was found that the quantity of bacteria, fungi and actinomyces in 0-10 and 10-20 cm depth of soil layer was higher than that of conventional cultivation, which demonstrated that notillage with straw covering could increase the quantity of soil microorganism. Therefore, applying no-tillage with straw coveting for a long time would be beneficial for enhancing the soil fertility, and improves environment for soil microorganisms.