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目的:通过滇重楼总皂苷含量和AM菌根侵染率与根际土壤性质的相关研究和通径分析,探讨土壤因子在滇重楼品质形成中的作用。方法:测定了25个主要分布区滇重楼根茎总皂苷含量、土壤理化性质和养分状况、根系AM菌根侵染率,并应用相关分析和通径分析研究了滇重楼总皂苷含量和菌根侵染率与土壤因子的关系。结果:在自然条件下,滇重楼根系能与AM真菌形成良好的共生关系,侵染率在36.41%～83.37%。总皂苷与脲酶活性、碱性磷酸酶活性、有机质含量呈显著正相关,与土壤容重呈显著负相关。AM菌根侵染率与碱解氮呈显著正相关。通径分析结果表明,滇重楼总皂苷含量主要受其根际土壤碱解氮的影响,其次为土壤有机质和脲酶活性。而菌根侵染率主要受土壤pH制约,其次为碱解氮、脲酶活性和速效磷。结论:滇重楼品质形成与土壤因子密切相关,通径分析更能反映土壤因子对滇重楼总皂苷含量和菌根侵染率的贡献。
OBJECTIVE: To study the effect of soil factors on the quality of Yunnan reef building through the correlation and path analysis of total saponin content, AM mycorrhizal infection rate and rhizosphere soil properties. Methods: The total saponin content, soil physicochemical properties and nutrient status of root rhizomes and the AM mycorrhizal infection rate in 25 major distribution areas were determined. Correlation analysis and path analysis were conducted to study the effects of total saponin content and bacteria Relationship between root infection rate and soil factors. Results: Under natural conditions, the root system of D. orientalis could form a good symbiotic relationship with AM fungi, with infection rates ranging from 36.41% to 83.37%. Total saponins had significant positive correlation with urease activity, alkaline phosphatase activity and organic matter content, but negatively correlated with soil bulk density. AM mycorrhizal infection rate and alkaline hydrolysis nitrogen was significantly positively correlated. The path analysis showed that the content of total saponins in Rhizoma Polygoni cuspidatum was mainly affected by alkaline rhizospheric nitrogen, followed by soil organic matter and urease activity. Mycorrhizal infection rate was mainly controlled by soil pH, followed by alkaline hydrolysis nitrogen, urease activity and available phosphorus. CONCLUSION: The quality of Dianhonglou is closely related to soil factors. Path analysis can better reflect the contribution of soil factors to the total saponins content and mycorrhizal infection in Dianbanlou.