蚯蚓粪与贝莱斯芽孢杆菌混合改良对土壤微生物群落结构的影响

利用蚯蚓粪和贝莱斯芽孢杆菌对辰山植物园的粉砂质壤土进行了改良,结果显示：与单独施加蚯蚓粪相比,蚯蚓粪与贝莱斯芽孢杆菌的混合处理可以更好地提高土壤酶活性及微生物量. 特别要注意的是：在土壤的微生物群落菌种数量,以及群落的多样性、丰富度、均匀度上,混合处理都优于两者的单独处理,分别提升了5.35%与13.81%,1.02%与2.35%,2.48%与16.68%,25.22%与11.99%. 实验结果也表明：混合改良处理有利于土壤优势菌群的形成,可以对抗相对较弱的病原菌种群,破坏或削弱病原菌,从而减少或避免作物病害. 这些研究结果为进一步探究微生物群落结构的变化对土壤肥力的影响,利用生物方法改良城市绿地土壤提供了借鉴.

Effects of amendments vermicompost and Bacillus velezensis on soil microbial community structure

In this paper, we improved the silty loam of Chenshan Botanical Garden with vermicompost and Bacillus velezensis. The results showed that, compared with the application of vermicompost alone, the mixed treatment of vermicompost and Bacillus velezensis could improve soil enzyme activity and microbial biomass better. In particular, the combination of vermicompost and Bacillus velezensis improved the soil microbial community more significantly. In terms of the number of bacteria and the diversity, richness and evenness of the community, the mixed treatment was superior to the two single treatments, which increased by 5.35% and 13.81%, 1.02% and 2.35%, 2.48% and 16.68%, 25.22% and 11.99%, respectively. The experimental results also show that the mixed improvement is conducive to the formation of soil beneficial microbial community, and the formation of soil dominant bacterial community can fight against relatively weak pathogen population, destroy or weaken the pathogen, so as to reduce or avoid crop diseases. These results are useful for further exploring the effects of changes in microbial community structure on soil fertility, and provide a reference for improving urban green soil by biological methods.