Impacts of Cropping Systems and Long-Term Tillage on Soil Microbial Population Levels and Community Composition in Dryland Agricultural Setting

Table 1

Summary of bacterial operational taxonomic unit (OTU) richness and diversity estimates in soil under different long-term tillage and rotation treatments.

Treatment^a	Sequence library size	Number of OTUs detected	Shannon’s diversity (𝐻^′)	Chao I richness
CT-CW	236	177	5.06	527
CT-RW	234	155	4.86	381
NT-CW	225	166	4.96	584
NT-RW	228	165	4.91	577
Total	923	541	—	—

^aNT: no tillage; CT: conventional tillage; CW: continuous wheat; RW: sorghum-wheat-soybean rotation.