Effects of Biochar Addition on Soil Physicochemical Properties and Rhizosphere Microbial Community Structure in Cotton Fields
Focusing on the effects of biochar application on soil physicochemical properties and the microbial community in the rhizosphere of cotton fields in Xinjiang,cotton rhizosphere soils were collected from four treatments:Control(CK),biochar 3 t/hm2(BC1),6 t/hm2(BC2)and 9 t/hm2(BC3).The changes in soil properties and rhizosphere soil microbial community structure and composition were analyzed.After biochar application,soil pH and electrical conductivity(EC)decreased by 5.58%-9.18%and 5.38%-18.04%,respectively.Compared with CK,biochar application significantly increased soil organic matter contents(SOM),total nitrogen(TN),total phosphorus(TP),alkali hydrolyzed nitrogen(AN),and available phosphorus(AP),among of which,BC3 had the best effects,but biochar application significantly reduced soil potassium content.Biochar application significantly reduced the relative abundance of Planctomycetota,Gemmatimonadota,Firmicutes and Mortierellomycota.However,the relative abundance of Ascomycota,Skermanella,Bryobacter,Chaetomium,Cephalotrichum,Chrysosporium,and Pyrenochaetopsis were increased.In addition,biochar application reduced microbial diversity and bacterial richness but increased fungal richness in the rhizosphere soils.Applying biochar significantly affected the community structure of rhizosphere soil microorganisms,especially fungi.Soil EC,available potassium(AK),and pH were the main factors affecting the rhizosphere soil microbial community.In conclusion,biochar application can improve the physicochemical properties of cotton field soil,thereby affecting the composition and structure of rhizosphere soil microbial communities,and 9 t/hm2 biochar application is recommended in this experiment.
万方数据
维普
