秸秆覆盖还田对黄瓜土壤碳氮比和微生物的影响

Effect of Straw Coverage on C/N and Microorganisms of Cucumber Soil

以“津春改良2号”黄瓜为试材,研究了秸秆覆盖及地膜覆盖处理对温室黄瓜结果期土壤有机碳、碳氮比和微生物的影响,以期探讨秸秆还田的效果和内在机制。结果表明：覆盖0.72kg·m-2秸秆量和地膜处理最为理想,可显著提高黄瓜结果初期和后期土壤有机碳含量和碳氮比,能显著提高黄瓜结果初期土壤5种微生物数量和后期细菌数;土壤中细菌数与0-20cm处有机碳含量、碳氮比呈显著正相关,土壤20-40cm碳氮比与纤维分解菌数呈显著负相关,而与固氮菌数呈显著正相关。

Cucumber was used as material,the effect of different cover of plastic film and straw on soil organic carbon,C/ N and microorganisms in greenhouse were studied, to explore the best treatment and internal mechanism. The results showed that treatment of 0. 72 kg · m^-2 straw with plastic film mulching was ideal, which significantly improved soil organic carbon content and C/N in the early and late stage,and improved the number of five kinds of microorganisms of early and late stage and bacteria of early stage. The number of soil bacteria was significantly positive correlated with the organic carbon content and C/N of 0-20 cm,and the C/N of 20-40 cm was negatively correlated with the number of fiber decomposing bacteria but positive correlated with that of nitrogen fixing bacteria.