关键词: 原生动物, 群落多样性, 植被类型, 群落构建

Abstract

Abstract：Aims: Protozoa are important components of soil microbial communities, playing dual roles as decomposers and reducers in ecosystems, and responsible for maintaining ecosystem balance, health, and energy flow hubs. Plant type was an important ecological factor affecting the characteristics of soil microbial communities, and the diversities of microbial communities were also varied under different plant types. In present, most of the studies focused on soil bacterial and fungal communities, and there were relatively few studies on the assembly mechanisms of protozoan community under different plant types.Meanwhile, the trade-offs in the community assembly processes were closely related to biological attributes and habitat conditions. It was of great significance for exploring the characteristics and construction processes of soil protozoan communities under different plant types, which could strengthen understanding the assembly mechanisms of protozoan community diversities in various ecosystems and strengthening biodiversity conservation.

Method: This study used high-throughput sequencing techniques to explore the diversity of soil protozoan communities under forest, shrub and grassland in the Luya Mountain. We aimed to reveal the soil protozoa community assembly mechanisms.

Results: The results showed that soil protozoan communities were divided into 9 kingdoms, 23 phyla, 58 classes, 117 orders, 215 families, 335 genera, and 1979 operational taxonomic units in the Luya Mountain. There were no significant differences in α diversity of soil protozoan communities among forest, grassland, and shrub in Luya Mountain. The structures of protozoan communities were varied among different plant types. The redundancy analysis results showed that soil total phosphorus and water content were the key environmental factors in determining the structures of protozoan communities in different plant types. The null model analysis results found that the assembly processes of soil protozoan communities in different plant types of Luya Mountain was dominated by random processes. Molecular ecological network analysis showed that the complexities of soil protozoan communities decreased from grassland to shrub and forest.

Key words: Protozoa, community diversity, plant type, community assembly