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<p> The ecological environment of the sandy areas in western Liaoning is fragile, and plant rhizosphere microorganisms play a crucial role in regulating soil nutrient cycling and enhancing plant drought resistance. <i>Syringa oblata</i> is one of the key afforestation tree species in these sandy areas. Revealing the dynamic interactions between the diversity and functions of its rhizosphere microorganisms and soil nutrients is significant for improving soil quality in semiarid sandy areas, enhancing plant drought resistance, and increasing stand stability.<i> Syringa oblata </i>growing in sandy areas were selected as the study subjects. Soil samples were collected from the 0–20 cm root zone depth, with surface weeds and litter thoroughly removed prior to sampling. Through highthroughput sequencing (16S rRNA) combined with soil Physical and Chemical Properties, this study inv estigated the structure, diversity, function, and nutrient interactions of rhizosphere microbial communities during the growing season (May-September). Results indicated that a total of 1737 OTUs were annotated in the <i>Syringa oblata</i> rhizosphere, belongingto 29 phyla and 55 classes. Dominant microbial groups included <i>Chloroflexi</i>,<i> Gemmatimonadetes</i>,<i> Nitrospirae</i>,<i> Thaumarchaeota</i>,<i> Myxomycota</i>,<i> Bacteroides</i>, and <i>Proteobacteria</i>. During the early growth phase, the experimental group exhibited increased abundance of <i>Chloroflexi</i>, <i>Alphaproteobacteria</i>,<i> Rubrob acteria</i>,<i> Dehalococcoides</i>, and <i>Thermoanaerobaculi compared</i> to the control group. During the vigorous growth phase, increases were observed in <i>Actinobacteria</i>,<i> Myxomycota</i>, and <i>Methylomirabilota;</i> In the late growth phase, increases were noted in <i>Actinobacteria</i>,<i> Acidobacteria</i>,<i> Acidimicrobia</i>, and <i>Holophagae.</i> Alpha diversity analysis indicated that species richness peaked during the late growth stage, followed by the early growth stage, and was lowest during the vigorous growth stage. These findings reveal that the root zone microbial community exhibits differences in major microbial groups at the phylum, class, and genus levels between the experimental and control groups across different growth stages. Soil factors influencing the <i>Syringa oblata</i> rhizosphere microbial community primarily included pH, organic carbon, total nitrogen, and available phosphorus. During the early growth stage and vigorous growth stage, the phylum <i>Gemmatimonadetes</i> showed a significant positive correlation with available phosphorus. During the vigorous growth stage and late growth stage, the class <i>Gammaproteobacteria</i> exhibited significant negative correlations with total nitrogen, pH, organic carbon, and available phosphorus. This study provides crucial scientific evidence for elucidating the molecular mechanisms underlying rhizosphere microbial soil interactions.</p>

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Study on the Interaction Relationship between the Diversity andFunction of Rhizosphere Microorganisms and Soil Nutrients during the Growing Season of Syringa Oblata in Sandy and Windy Areas of Western Liaoning

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Mengxuan He,
  • Sinan Gao,
  • Bingyu Zhang,
  • Jiao Deng,
  • Ping Liu

摘要

The ecological environment of the sandy areas in western Liaoning is fragile, and plant rhizosphere microorganisms play a crucial role in regulating soil nutrient cycling and enhancing plant drought resistance. Syringa oblata is one of the key afforestation tree species in these sandy areas. Revealing the dynamic interactions between the diversity and functions of its rhizosphere microorganisms and soil nutrients is significant for improving soil quality in semiarid sandy areas, enhancing plant drought resistance, and increasing stand stability. Syringa oblata growing in sandy areas were selected as the study subjects. Soil samples were collected from the 0–20 cm root zone depth, with surface weeds and litter thoroughly removed prior to sampling. Through highthroughput sequencing (16S rRNA) combined with soil Physical and Chemical Properties, this study inv estigated the structure, diversity, function, and nutrient interactions of rhizosphere microbial communities during the growing season (May-September). Results indicated that a total of 1737 OTUs were annotated in the Syringa oblata rhizosphere, belongingto 29 phyla and 55 classes. Dominant microbial groups included Chloroflexi, Gemmatimonadetes, Nitrospirae, Thaumarchaeota, Myxomycota, Bacteroides, and Proteobacteria. During the early growth phase, the experimental group exhibited increased abundance of Chloroflexi, Alphaproteobacteria, Rubrob acteria, Dehalococcoides, and Thermoanaerobaculi compared to the control group. During the vigorous growth phase, increases were observed in Actinobacteria, Myxomycota, and Methylomirabilota; In the late growth phase, increases were noted in Actinobacteria, Acidobacteria, Acidimicrobia, and Holophagae. Alpha diversity analysis indicated that species richness peaked during the late growth stage, followed by the early growth stage, and was lowest during the vigorous growth stage. These findings reveal that the root zone microbial community exhibits differences in major microbial groups at the phylum, class, and genus levels between the experimental and control groups across different growth stages. Soil factors influencing the Syringa oblata rhizosphere microbial community primarily included pH, organic carbon, total nitrogen, and available phosphorus. During the early growth stage and vigorous growth stage, the phylum Gemmatimonadetes showed a significant positive correlation with available phosphorus. During the vigorous growth stage and late growth stage, the class Gammaproteobacteria exhibited significant negative correlations with total nitrogen, pH, organic carbon, and available phosphorus. This study provides crucial scientific evidence for elucidating the molecular mechanisms underlying rhizosphere microbial soil interactions.