Effects of lying fallow on enzyme activities and bacterial community structures in tobacco-planting soils with continuous cropping obstacles
To investigate possible mechanisms of lying fallow on the microecological environment of soils with continuous cropping obstacles, the effects of lying fallow on the enzyme activities and bacterial community structure in soils was studied in continuous tobacco cropping fields with severe bacterial wilt. The results showed that lying fallow effectively promoted the contents of organic matter, alkali-hydrolyzed nitrogen and enzyme activities in soils. Especially after two fallow years, soil invertase and catalase activities increased by 147.85% and 64.13% respectively, as compared with continuous tobacco cropping. Lying fallow was beneficial to promote the abundance of bacterial community in soils. With the increase of fallow years, Chao index and Shannon index increased, while Simpson index decreased. The relative abundances of beneficial bacteria Acidobacteria and Roseiflexus were significantly higher, while that of pathogenic bacteria Ralstonia was significantly lower in the fields after lying fallow than in continuous tobacco cropping fields. The incidence of bacterial wilt in tobacco fields lying fallow for one or two years was lower by 22.62% or 32.55% than that in continuous tobacco cropping fields, respectively. Therefore, lying fallow improves the microecological environment and fertility of tobacco-growing soils with continuous cropping obstacles and reduces the incidence of bacterial wilt.
Tobacco-planting soilLying fallowContinuous cropping obstacleBacterial wiltMicroecologyEnzyme activityBacterial community structure
国家科技期刊平台
NSTL
万方数据
维普
