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 Aca-demy of Sciences, Beijing 100101, China.
Ying Yong Sheng Tai Xue Bao. 2024 Aug;35(8):2099-2107. doi: 10.13287/j.1001-9332.202408.001.
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 Carr. and Koidz. grown in pure stands as well as in various levels of mixture (i.e., and 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 , 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 , 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 , while it was mostly affected by soil carbon content in (explainable by 3.5%). Both and are capable of adapting to conditions with competition for, and sharing of, soil nutrients in mixed forests through morphological variations of EcM.
菌根多样性和形态可塑性决定了宿主植物对生境变化的适应能力。为了了解针叶树和阔叶树混合对外生菌根（EcM）共生体形态特征的影响，我们基于对山西省太岳山纯林以及不同比例（即 3:1、1:1 和 1:3）混合林中生长的 Carr. 和 Koidz. 的 EcM 形态特征的系统调查，研究了环境因素对形态特征变化的影响。结果表明，在所有林分类型中，两种树种的 EcM 主要都是接触探测型。在 中，混合林分中接触和中程探测型的根尖数量分别比纯林分增加了 3%-10%和 10%-16%。在 中，混合林分中接触探测型的根尖数量比纯林分高 5%-10%。在两种树种中，混合林分的 Simpson 形态多样性指数值均高于纯林分。冗余分析表明，EcM 的形态可变性主要受土壤氮磷比（可解释 7.5%）和土壤含水量（可解释 5.2%）的影响，而在 中主要受土壤碳含量的影响（可解释 3.5%）。和 都能够通过 EcM 的形态变化来适应混合林中对土壤养分的竞争和共享。
