湖北保康不同海拔高度烟田土壤微生物分析

Effect of Elevation on the Soil Microbe Quantity in Tobacco-Growing Region of Baokang in Hubei Province

对不同海拔高度的烟田土壤中微生物进行测定和分析。结果表明,在不同海拔高度烟田土壤中,烟草采收期细菌和固氮菌数量随海拔高度的增加而增加。固氮菌变化速率和细菌变化速率高于放线菌变化速率和真菌变化速率,细菌和固氮菌变化速率随海拔高度的增加而增加,采收期细菌和固氮菌变化速率高于旺长期。细菌、固氮菌和放线菌根土比随海拔高度的增加呈增加趋势,在海拔高度为1 095 m,细菌、固氮菌和放线菌根土比最高。不同海拔高度烟田土壤中采收期细菌与真菌数量的比值(B/F)高于旺长期,海拔为746 m的烟田土壤中细菌与真菌数量的比值小于海拔933和1 095 m。

The effect of elevation on the soil microbe quantity in tobacco-growing region of Baokang in Hubei province was studied.The results showed that the quantity of soil bacteria and nitrogen-fixing bacteria in harvest period increased with the increasing of elevation in tobacco field soil.The change speed of nitrogen-fixing bacteria and bacteria were higher than that of actinomyces and fungi,and the change speed of bacteria and nitrogen-fixing bacteria increased with the increasing of elevation.The change speeds of bacteria and nitrogen-fixing bacteria in harvest period were higher than that in growing period.The quantity ratio of soil bacteria,nitrogen-fixing bacteria and actinomyces in rhizosphere soil to that in non-rhizosphere soil increased with the increasing of elevation,and the ratio at the elevation of 1 095 m was the highest.The quantity ratio of bacteria to fungus(B/F) in growing period was higher than that in harvest period at different elevations and the ratio at the elevation of 746 m was lower than that at the elevation of 933 m and 1 095 m.