ArticleWorld journal of microbiology & biotechnology2026
Age-related changes in Populus euphratica forests alter the structure and function of rhizosphere bacterial communities.
Article in World journal of microbiology & biotechnology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
As a key constructive tree species in arid ecosystems, Populus euphratica plays a vital role in maintaining desert ecological stability. The rhizosphere microorganisms of P. euphratica are crucial for supporting its adaptation to extreme environments. However, the dynamic changes and ecological functions of rhizosphere bacterial communities across its growth stages remain poorly understood. In our study, P. euphratica forests across stand ages, including young forest, middle-aged forest, near-mature forest, mature forest, over-mature forest, and senescent stages were used as research objects. Based on Illumina MiSeq high-throughput sequencing technology, the dynamic changes in the rhizosphere bacterial communities were analyzed. The results indicated that the bacterial alpha-diversity showed an initial increase followed by a decrease, and the middle-aged and over-mature forests exhibited higher diversity. Salinimicrobium, Nitrolancea, and unidentified_Alphaproteobacteria were the dominant genera across all growth stages. Additionally, there were forest age-specific genera. Soil available nitrogen was positively correlated with the richness of generalist bacteria, but negatively correlated with that of specialist bacteria. This suggests that ecological niche differentiation may occur between them due to their distinct nitrogen utilization strategies. Co-occurrence network analysis revealed that the interactions among bacteria were predominantly positive, and the mature forest exhibited more modules and higher connectivity strength. This suggests that the community at the mature forest may develop stronger integrity through closer interspecific interactions, thereby enabling better adaptation to the rhizospheric microenvironment. The predicted abundance of primary metabolic pathways, such as nucleotide metabolism and amino acid metabolism, was higher for the young forests. The results provide data support for understanding the plant-microbial interaction and the stability of forest ecosystems in arid areas.
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