Zhang Xingming, Wang Bin, Chen Ting, Guo Yili, Li Xiankun
Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, China.
College of Urban Construction, Wuchang Shouyi University, Wuhan, China.
Front Microbiol. 2023 Apr 17;14:1103550. doi: 10.3389/fmicb.2023.1103550. eCollection 2023.
Rhizosphere microbes have an extremely close relationship with plants and the study on the relationship between rhizosphere microorganisms and their influencing factors is conducive to the protection of vegetation and the maintenance of biodiversity. Here we investigated how plant species, slope positions and soil types affect the rhizosphere microbial community. Slope positions and soil types were collected from northern tropical karst and non-karst seasonal rainforests. The results indicated that soil types played a predominant role in the development of rhizosphere microbial communities (28.3% of separate contribution rate), more than plant species identity (10.9% of separate contribution rate) and slope position (3.5% of separate contribution rate). Notably, environmental factors closely related to soil properties were the major influence factors that controlling the rhizosphere bacterial community structure in the northern tropical seasonal rainforest, especially pH. Additionally, plant species also influenced the rhizosphere bacterial community. In low nitrogen content soil environments, rhizosphere biomarkers of dominant plant species were often nitrogen-fixing strains. It suggested that plants might have a selective adaptation mechanism to rhizosphere microorganisms to obtain the advantages of nutrient supply. Overall, soil types exerted the biggest influence on rhizosphere microbial community structure, followed by plant species and finally slope positions.
根际微生物与植物有着极其密切的关系，研究根际微生物与其影响因素之间的关系有助于保护植被和维持生物多样性。在此，我们调查了植物种类、坡位和土壤类型如何影响根际微生物群落。坡位和土壤类型取自北热带喀斯特和非喀斯特季节性雨林。结果表明，土壤类型在根际微生物群落的发育中起主要作用（单独贡献率为28.3%），超过植物种类（单独贡献率为10.9%）和坡位（单独贡献率为3.5%）。值得注意的是，与土壤性质密切相关的环境因素是控制北热带季节性雨林根际细菌群落结构的主要影响因素，尤其是pH值。此外，植物种类也影响根际细菌群落。在低氮含量的土壤环境中，优势植物种类的根际生物标志物通常是固氮菌株。这表明植物可能对根际微生物具有选择性适应机制，以获得养分供应优势。总体而言，土壤类型对根际微生物群落结构的影响最大，其次是植物种类，最后是坡位。
