Goss-Souza Dennis, Mendes Lucas William, Borges Clovis Daniel, Baretta Dilmar, Tsai Siu Mui, Rodrigues Jorge L M
Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, 13400-970, Brazil.
Applied Ecology Graduate Program, Luiz de Queiroz School of Agriculture, University of São Paulo, Piracicaba, SP, 13418-900, Brazil.
FEMS Microbiol Ecol. 2017 Oct 1;93(10). doi: 10.1093/femsec/fix109.
We evaluated the bacterial and archaeal community dynamics and assembly in soils under forest, grassland and no-till cropping, using a high-throughput shotgun metagenomics approach. No significant alterations in alpha diversity were observed among different land uses, but beta diversity in grassland was lower than that observed in forest and no-till soils. Grassland communities showed assembly that predominantly followed the neutral model, i.e. high homogenizing selection with moderate dispersion, leading to biotic homogenization. Both no-till and forest soil communities were found to have assembly that predominantly followed a niche model, i.e. low rates of dispersal and weak homogenizing selection, resulting in maintenance of higher beta diversity relative to grasslands, indicating niche specialization or variable selection. Taken together, our results indicate that the patterns of assembly and their governing processes are dependent on the land use employed after deforestation, with consequences for taxa turnover and microbial functional potential.
我们采用高通量鸟枪法宏基因组学方法，评估了森林、草地和免耕种植土壤中的细菌和古菌群落动态及组装情况。不同土地利用方式间未观察到α多样性的显著变化，但草地的β多样性低于森林和免耕土壤。草地群落的组装主要遵循中性模型，即具有适度扩散的高同质化选择，导致生物同质化。免耕和森林土壤群落的组装主要遵循生态位模型，即低扩散率和弱同质化选择，相对于草地而言，这导致更高的β多样性得以维持，表明生态位特化或可变选择。综上所述，我们的结果表明，组装模式及其控制过程取决于森林砍伐后的土地利用方式，这对分类群周转和微生物功能潜力具有影响。
