Abstract
Limited knowledge about the variation patterns of bacterial community composition in the sand and vegetative ecosystems confines our understanding regarding the contribution of the sand dune to desert areas. In this study, 454 pyrosequencing platforms were adopted to determine the community structure of bacteria and diversity of sand dunes in northeastern Qinghai-Tibet Plateau, China: 50 cm deep, rhizosphere, physical crusts, and biological crusts representing sand and vegetative ecosystems, respectively. The findings revealed significant variation in bacterial diversities and the structure of communities in the sand and vegetative ecosystems. The dominant bacterial phyla of sand and vegetative ecosystems were Firmicutes (47%), Actinobacteria (21%), Proteobacteria (16%), and Bacteroidetes (13%), while Lactococcus (50%) was found to be the dominant genus. Furthermore, samples with high alpha-diversity indices (Chao 1 and Shannon) for the vegetative ecosystem have the lowest modularity index and the largest number of biomarkers, with some exceptions. Redundancy analysis exhibited that environmental factors could explain 72% (phyla) and 67% (genera) of the bacterial communities, with EC, TC, and TOC being the major driving factors. This study expands our understanding of bacterial community composition in the desert ecosystem. The findings suggest that variations in the sand and vegetative ecosystems, such as those predicted by environmental factors, may reduce the abundance and diversity of bacteria, a response that likely affects the provision of key ecosystem processes by desert regions.
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This work was supported by grants from the National Science Foundation of China (31870479) and the Scientific Project of Gansu Province (20JR5RA548, 18JR2TA019). The CAS-President’s International Fellowship Initiative (PIFI) Postdoctoral Fellowship (2021PB0072).
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AB, WS, and FN designed the study, GZ and WZ collected soil samples, AB, WS, and WZ analyzed the data. AB wrote the manuscript, GL and TC supervised.
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Bahadur, A., Zhang, W., Sajjad, W. et al. Bacterial diversity patterns of desert dunes in the northeastern Qinghai-Tibet Plateau, China. Arch Microbiol 203, 2809–2823 (2021). https://doi.org/10.1007/s00203-021-02272-z
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DOI: https://doi.org/10.1007/s00203-021-02272-z