油松与辽东栎混交对外生菌根形态的影响  

Effects of Pinus tabuliformis and Quercus liaotungensis mixture on morphological characteristics of ectomycorrhizae

作　　者：肖杨 陈璐璐 吴传敬 张雨雪 孙建新[1] XIAO Yang;CHEN Lulu;WU Chuanjing;ZHANG Yuxue;SUN Jianxin(School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;School of Life Sciences,Hebei University,Baoding 071002,Hebei,China)

机构地区：[1]北京林业大学生态与自然保护学院,北京100083 [2]中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室,北京100101 [3]河北大学生命科学学院,河北保定071002

出　　处：《应用生态学报》2024年第8期2099-2107,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31870426)资助。

摘　　要：菌根多样性和形态可塑性决定了寄主植物适应生境变化的能力。为了解针阔叶树种混交对外生菌根形态特征的影响及其潜在机制,本研究调查了山西太岳山油松和辽东栎纯林及混交林(油松与辽东栎3:1混交、1:1混交、1:3混交)外生菌根形态特征,分析了环境因子对外生菌根形态变异的影响。结果表明:所有林型中油松和辽东栎外生菌根均以无外延菌丝或极少外延菌丝的密接型为主;油松在混交林中根部密接型和中程型外生菌根的根尖数量分别比纯林显著升高3%~10%和10%~16%,辽东栎在混交林中根部密接型外生菌根养分获取类型的根尖数量比纯林显著升高5%10%;油松和辽东栎在混交林中外生菌根Simpson形态多样性指数显著高于纯林。冗余分析表明,油松中土壤氮磷比对其外生菌根形态变异的影响最大(解释率为7.5%),其次为土壤含水率(5.2%),而土壤碳含量对辽东栎外生菌根形态变异的影响最大(3.5%)。油松和辽东栎在混交时均可以通过外生菌根的形态变异以适应对土壤养分的竞争和共享。The mycorrhizal diversity and morphological plasticity determine the adaptability of host plants to habitat changes. To understand the effects of mixture between coniferous and broadleaf trees on the morphological characteri-stics of ectomyzorrhizal(EcM) associations, we examined the influences of environmental factors on changes in morphological characteristics based on a systematic investigation of the EcM morphological traits in Pinus tabuliformis Carr. and Quercus liaotungensis Koidz. grown in pure stands as well as in various levels of mixture(i.e., P. tabuliformis and Q. liaodongensis in a 3:1 mixture, a 1:1 mixture, and a 1:3 mixture) in Taiyue Mountains of Shanxi Province. Results showed that the EcM in both species are predominantly of the contact exploration type in all stand types. In P. tabuliformis, the root tip numbers of the contact and medium-distance exploration types in mixed stands were significantly greater by 3%-10% and 10%-16%, respectively, than in pure stands. In Q. liaotungensis, the root tip numbers of the contact exploration type in mixed stands were significantly higher by 5%-10% than in pure stands. In both species, the values of Simpson morphological diversity index were higher in mixed stands than in pure stands. Redundancy analysis indicated that the morphological variability of EcM was mostly affected by soil nitrogen to phosphorus ratio(explainable by 7.5%) and soil water content(explainable by 5.2%) in P. tabuliformis, while it was mostly affected by soil carbon content in Q. liaotungensis(explainable by 3.5%). Both P. tabuliformis and Q. liaotungensis are capable of adapting to conditions with competition for, and sharing of, soil nutrients in mixed forests through morphological variations of EcM.

关 键 词：共生生境 外生菌根 外生菌根形态 养分获取策略 

分 类 号：S791.254[农业科学—林木遗传育种] S792.18[农业科学—林学]