林下大百合根际土壤微生物及化学特征分析.

This study aimed to provide a theoretical basis for selection of a suitable upper canopy tree species for a community hosting Cardiocrinum giganteum. Soil microbes in the rhizosphere soil of C. giganteum, planted under Cunninghamia lanceolate, Phyllostachys edulis, and P. edulis×C. lanceolata×Eucommia ulmoides canopies, were sequenced using the Illumina-MiSeq high throughput sequencing technology. Soil microbial community structure differences and relationships with soil chemical characteristics were analyzed. The rhizosphere soil under C. lanceolata exhibited the lowest pH value(4.91)and highest organic matter content(51.67 g·kg-1). These conditions were conducive to the enrichment of bacteria genera with high relative abundance, including Candidatus_Solibacte, Burkholderia, and Bryobacter. Under these conditions, decreased bacterial diversity and specificity were observed. The rhizosphere soil under P. edulis exhibited the highest pH value(5.65). This condition improved bacterial specificity and reduced the relative abundance of dominant bacterial genera. The rhizosphere soil under P. edulis×C. lanceolata×E. ulmoides displayed the highest bacterial diversity and highest soil urease and phosphatase activities. The structure and richness of C. giganteum in the soil rhizosphere were different in the same upper layer forest. Lower soil nutrient content and higher pH values tended to exhibit greater soil-fungi diversity and specificity. Due to plentiful soil nutrients, rich bacterial diversity, and high soil urease and acid phosphatase activities, the mixed forest canopy containing P. edulis×C. lanceolata×E. ulmoides should be selected as the most favorable community for C. giganteum planting, to promote bulb growth. [ABSTRACT FROM AUTHOR]