垄沟覆盖集雨模式对玉米根际土壤微生物多样性的影响OA北大核心CSTPCD

This study used Dengyi No.2 maize as the experimental material to assess the effects of furrow cover rainfall collection mode on the microbial community structure and diversity of maize rhizosphere soil.A single-factor completely-randomized experimental design was adopted,and conventional plain planting without mulch-ing was used as the control(CK).Soil microbial community composition and diversity were analyzed using Illu-mina high-flux sequencing technology.Six treatments comprising ridges covered with the following were set:or-dinary black mulch(HL),liquid mulch(YL),straw(NJ),liquid mulch(YJ),and ordinary black mulch(HJ).The results showed that:(1)The rain-harvesting mode of ridge and furrow mulching was beneficial in increasing corn yield and water use efficiency.Among the six treatments,the number of rows per ear,1000-grain weight,yield,and water use efficiency of treated HJ were the highest:11.22%,31.31%,88.02%,and 79.83%higher than that of control CK,respectively.There were significant differences between the NJ treatment and CK(P<0.05);howev-er,the yield and water use efficiency of NJ treatment were lower than those of the CK treatment.(2)Each treat-ment of ridge and furrow mulching except for NJ significantly increased microbial community diversity and changed the microbial structure.(3)The microbial community composition of each treatment was affected by the precipitation harvesting mode at the phyla and class levels.The main bacterial phyla in the soil microbial commu-nity were discovered to be Proteobacteria,Acidobacteria,Gemmatimonadetes,and Bacteroidetes.The main domi-nant Bacteroidia were Gammaproteobacteria(25.8%),Bacteroidia(8.4%),and Alphaproteobacteria(7.7%).Therefore,ridge mulching can improve soil microbial richness,diversity,and evenness index.In other words,the corrugation and rain-harvesting modes can change the structure and composition of the soil microbial at the phyla and class levels to increase corn yield.