The Impact of Sodium Selenite Applied to the Root System on the Diversity of Soil Microorganisms in the Rhizosphere of Large-leaf Tea Tree
This study aimed to investigate the effects of varying concentrations of sodium selenite on the rhizosphere microbial community structure of Yunnan large-leaf tea plants.A pot experiment was conducted,and after selenium-enriched soil treatment,changes in the rhizosphere soil microbial communities were analyzed.The results demonstrated that the application of sodium selenite significantly influences the health and stability of the soil ecosystem,exhibiting a"low-dose promotion,high-dose suppression"effect on microbial diversity.Specifically,the application of sodium selenite at a dosage of 0.9 mg/kg was most beneficial for the richness of bacterial and fungal communities,whereas a dosage of 3.0 mg/kg significantly reduced microbial richness and diversity,disrupting the sustainable development of the soil.The increase in sodium selenite concentration may lead to the reorganization of microbial community structure by altering soil nutrient conditions or microbial interactions.At application dosages between 0.30 and 1.50 mg/kg,the higher-order taxonomic structure of soil bacterial and fungal communities remained undisturbed.Moreover,the fungal and bacterial community structures in the rhizosphere soil of large-leaf tea plants exhibited considerable resilience,and the impact of the rational application of sodium selenite on community diversity and evenness was limited.Bacteria were more widely distributed in the rhizosphere soil across all treatment groups,while fungi were more sensitive to changes in sodium selenite concentration.The findings provide scientific evidence for the rational application of selenium fertilizers and the sustainable development of tea garden soil ecosystems.
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