九寨沟亚高山环境不同菌根类型空间分布格局  

Spatial Distribution Pattern of Different Mycorrhizal Types in the Subalpine Environment of Jiuzhaigou

作　　者：甘俊 张雨娇 肖维阳 李晓慧 刘淇 吴粤蓉 何磊[1] GAN Jun;ZHANG Yujiao;XIAO Weiyang;LI Xiaohui;LIU Qi;WU Yuerong;HE Lei(College of Life Science,Sichuan Normal University,Chengdu 610101,Sichuan;Administration Bureau of Jiuzhaigou National Nature Reserve,Aba 623402,Sichuan)

机构地区：[1]四川师范大学生命科学学院,四川成都610101 [2]九寨沟国家级自然保护区管理局,四川阿坝623402

出　　处：《四川师范大学学报(自然科学版)》2025年第4期510-515,共6页Journal of Sichuan Normal University(Natural Science)

基　　金：国家自然科学基金(40871234);九寨沟湖泊沼泽化及河道生态恢复研究项目(N5132112022000246)。

摘　　要：菌根共生对于植物适应各种逆境胁迫具有积极的作用,它深刻影响着植物的定居和群落结构,在亚高山生态系统中发挥关键的生态功能.以九寨沟亚高山森林为研究对象,分析不同植被带(海拔范围2000~3500 m)下19科26属45种植物根系的菌根真菌类型占比及浸染情况.研究结果显示:九寨沟亚高山主要存在丛枝菌根(Arbuscular mycorrhizal,AM)、外生菌根(Ectomycorrhizae,ECM)和杜鹃类菌根(Ericoid mycorrhiza,ERM)3种菌根类型.这些菌根的海拔分布模式各不相同,AM侵染比例随海拔增加而下降,ERM随海拔增加而增加,在暗针叶林带(~3000 m),ECM优势最为突出;进一步的分析表明,菌根类型分布受海拔变化导致的多种因素影响,其中,土壤总磷(TP)是关键的影响因子.这些发现为进一步理解亚高山生态系统的生物多样性和生态功能提供了重要依据.Mycorrhizal symbiosis plays a crucial role in enabling plants to cope with various environmental stresses,where it profoundly influences plant establishment and community structure,exerting critical ecological functions in subalpine ecosystems.Focusing on the subalpine forests of Jiuzhaigou,we analyzed the proportional abundance and colonization of mycorrhizal fungi in the root systems of 45 plant species belonging to 26 genera and 19 families across different vegetation belts(elevation range from 2000 to 3500 m.a.s.l.).The results revealed that three types of mycorrhizal associations are mainly found in the subapline of Jiuzhaigou,including arbuscular mycorrhizal(AM),ectomycorrhizal(ECM),and ericoid mycorrhizal(ERM).These mycorrhizal types exhibited distinct altitudinal distribution patterns,with the proportion of AM colonization decreasing with elevation,ERM increasing with elevation,and ECM dominating in the dark coniferous forest zone(~3000 m).Further analyses indicated that the distribution of mycorrhizal types was influenced by various factors associated with altitude fluctuations,among which soil’s total phosphorus(TP)emerged as a key factor.These findings provide important insights into understanding the biodiversity and ecological functions of subalpine ecosystems.

关 键 词：海拔梯度 菌根类型 亚高山环境 

分 类 号：X173[环境科学与工程—环境科学]