目的 了解横断山脉亚高山高山栎根系可培养真菌组成及多样性。 方法 以该地区3种高山栎根系为材料，利用根系浸泡染色方法观察根系内真菌共生状况，并对根内真菌进行分离和纯化，结合形态学与分子生物学的方法对其种类进行鉴定。 结果 根系染色可发现大量暗色有隔真菌和AMF丛枝结构，共鉴定出17科20属27种真菌，发现1种外生菌根真菌Ceratobasidiaceae（GSL1-7），4种暗色有隔真菌（DSE）Boeremia exigua var. exigua（GSL1-F）、Phoma herbarum（GSL20-A）、Phialophora mustea（GSL2-2，GSL2-9）、Paraboeremia putaminum（GSL4-F，GSL20-B），以及2种有促生作用的真菌Pseudogymnoascus roseus（GSL4-1-A，GSL4-2）和Trichoderma tomentosum（GSL80-D）。α多样性分析发现，3种高山栎根系内生真菌多样性丰富，但差异不显著。4种DSE和3种植物促生真菌在根系中占比可达31.3%。 结论 该类益生真菌对高山栎在横断山脉恶劣环境条件下的适应性生长发挥重要作用。本研究结果初步为阐明横断山脉地区高山栎的生态适应性机制提供了理论依据，同时为开发利用促生菌在高山栎育苗中的应用提供了活体菌种资源。

The physiological and biochemical responses of Camellia oleifera to low phosphorus stress were investigated in this study, and the different phosphorus concentrations of the treatments were conducted by using a single factor experiment with water culture in the greenhouse. Results showed that the activity of APA in leaves tissues and those secreted by the roots all increased under P deficiency, which respectively increased by 16.49% - 86.47% and 28.7% - 58.7% compared with those of the control. The increase of APA may be an active adaptive response of Camellia oleifera to low phosphorus stress.Under the situation of low phosphorus stress, the concentrations of soluble sugar and free proline increased whereas the soluble protein decreased,those showed that normal protein synthesis and carbohydrate metabolism were blocked under the situation of low phosphorus stress; Moreover, the homeostasis established by the increase of MDA concent and protective enzyme (SOD) activity in leaves was the mechanism of the adaptive response for Camellia oleifera to low phosphorus stress.