Geographical Pattern Of Soil Bacteria Biodiversity In Soil Profile Along With Precipitation Gradient In Farmland,Jilin Province,Northeastern China

Soil bacteria are ubiquitous and very important community in the soil.The bio-geographical pattern of soil microbial diversity is driven by key global change that play a critical role in soil functioning of biologically diverse ecosystems.Previous studies discovered the biogeographical distribution pattern of soil bacteria communities along a temperature gradient transect in surface layer of black soil zone in northeastern China.In this study,we selected a precipitation gradient transect to investigate the large-scale distribution pattern of soil bacteria biodiversity and its driving effects on ecosystem of cropland in soil profile.In total,897,776803 optimized sequencings were obtained from using the quantitative PCR and Illumina Mi Seq and 16 S r RNA sequencing methods and soil bacteria community distribution was estimated through the 54 soil samples.These sequencing belonged to Northeast China Transect(NECT)were across all soil samples of cropland,the dominant bacteria were classified into sub-groups and these groups across all the soil samples of cropland(>1% of all sequences)were Proteobacteria,Acidobacteria,Actinbacteria,Chloroflexi.The distribution and diversity of the soil bacteria were dominantly affected stronger by precipitation gradient.PCA analysis based on OTUs showed that the geographical distribution of community variables 38.12% similarity between them overall and the soil environmental factors explained approximately 20.71% of the variations.The relative abundance of community on phylum level,diversity of soil bacteria distribution increasing with the low precipitation gradient from west to east.Consequently,these findings may have important suggestions for understanding the effects of global change(e.g.,precipitation)on the large scale of the biodiversity pattern had significant effect on ecosystem.Our understanding of how soil bacterial diversity patterns may respond to future global change effects in different regions to improve the biogeographic pattern in soil profile along a precipitation gradient.