Relationship between AM fungi resources and soil factors under different climatic conditions | 不同气候条件下AM真菌资源与土壤理化性质的关系

chinois. 探讨不同气候条件下AM真菌资源与土壤理化性质的关系。以陕西宁陕、横山的刺槐和小叶杨为材料，分析不同气候条件下植物根际土壤中丛枝菌根(AM)真菌的种属分布，以及土壤因子与其侵染率和孢子密度的关系。(1)在宁陕、横山的刺槐和小叶杨根际土壤中共分离鉴定出AM真菌22种，分别隶属于球囊霉属（Glomus）、原囊霉属（Archaeospora）、无梗囊霉属（Acaulospora）、巨孢囊霉属（Gigaspora）和盾巨孢囊霉属（Scutellospora），其中球囊霉属（Glomus）为优势属。宁陕、横山小叶杨和刺槐根际土壤中鉴定出的AM真菌种类数目分别为13，13和18，19。(2)有效N、速效P含量与各采样地AM真菌侵染率和孢子密度均呈正相关；有机质含量与横山刺槐根际的AM真菌侵染率和孢子密度均呈正相关，与横山、宁陕小叶杨及宁陕刺槐均呈负相关；pH与横山、宁陕小叶杨及宁陕刺槐根际的AM真菌侵染率和孢子密度均呈正相关，与横山刺槐呈负相关。(3)通径分析结果表明，各类土壤理化性质对不同宿主植物的AM真菌侵染率和孢子密度影响程度不同。不同气候带AM真菌多样性存在差异；不同宿主植物、土壤理化性质对其根际AM真菌侵染率和孢子密度的影响有一定差异。

anglais. The study was to explore the relationship between arbuscular mycorrhiza (AM) fungi and soil factors under different climatic conditions. The mycorrhizal structure type and species of AM fungi in rhizosphere of two plants, Populus simonii Carr and Robinia pseudoacacia L. in Ningshan and Hengshan under different climatic conditions, and the effects of soil factors on colonization rate and spore density were studied. The results showed that 22 species of AM fungi were identified from the rhizosphere of plants. They belonged to Glomus, Archaeospora, Acaulospora, Gigaspora and Scutellospora 5 genus and Glomus was the dominant genera. The numbers of species of AM fungi identified from the rhizosphere of Populus simonii Carr and Robinia pseudoacacia in Ningshan and Hengshan were 13, 13 and 18, 19. Correlation analysis between soil factors and AM fungi spore density or colonization rate revealed that Available N and Available P were positively correlated with AM fungi spore density or colonization rate in all samples. Organic matter was positively correlated with AM fungi spore density or colonization rate of Robinia pseudoacacia in Hengshan, and negatively correlated with Robinia pseudoacacia in Ningshan, Populus simonii Carr in Ningshan and Hengshan, and pH appeared on the contrary. Path analysis indicated that soil factors on different host plants infect AM fungi spore density or colonization rate in different degrees. These results indicated that the mycorrhizal structure type and species of AM fungi are diversified under different climatic conditions; The effects of soil factors on AM fungi colonization rate or spore density vary with host plants.