Characterizations and functions of microbial communities in lakes in the Qaidam Basin
Received date: 2025-03-18
Revised date: 2025-06-18
Online published: 2025-11-24
Assessments of microbial community structure and function in lake sediments are critical for understanding the stability of lake ecosystems and biogeochemical cycles. This study applied high-throughput sequencing technology to analyze the structural characteristics, driving factors, interactions, assembly processes, and potential functions of bacterial and fungal communities in sediments from four typical lakes in the Qaidam Basin, Qinghai Province, China. The results showed: (1) The diversity and abundance of bacterial and fungal communities were highest in the sediments of Keluke Lake. However, the Kruskal-Wallis test illustrated that the differences in the alpha diversity indices of bacterial and fungal communities in the lake sediments were not significant (P>0.05). (2) The dominant bacterial phylum in the sampled lake sediments was Firmicutes (3.06%-57.58%), whereas the dominant fungal phylum was Ascomycota (10.12%-97.51%). Total Phosphorus was the most significant driving factor for bacterial community structure, whereas longitude was the most significant driving factor for fungal community structure. The interactions between bacterial and fungal communities were predominantly positive (96.05%). (3) The assembly process of bacterial communities was dominated by dispersal limitation (59.09%), whereas that of fungal communities was dominated by drift and other processes (80.10%). Functional prediction indicated that bacterial communities were mainly involved in amino acid transport and metabolism, whereas fungal communities mainly participated in degrading organic matter and decomposing dead host cells. This study provides basic data support for the excavation of lake microbial resources in the Qaidam Basin and offers a scientific basis for the ecological environment protection and restoration of lakes in this region.
XIE Yanqin , WANG Dandan , HUANG Yuefei , JIA Haichao , YIN Hengzhi , LI Borong , GAO Yinxuan . Characterizations and functions of microbial communities in lakes in the Qaidam Basin[J]. Arid Zone Research, 2025 , 42(8) : 1437 -1450 . DOI: 10.13866/j.azr.2025.08.08
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