植物生态学报 ›› 2024, Vol. 48 ›› Issue (5): 612-622.DOI: 10.17521/cjpe.2023.0328  cstr: 32100.14.cjpe.2023.0328

所属专题: 植物功能性状

• 研究论文 • 上一篇    下一篇

阔叶红松林不同菌根类型幼苗细根功能性状的变异与权衡

徐子怡1, 金光泽1,2,*()()   

  1. 1东北林业大学生态研究中心, 哈尔滨 150040
    2东北林业大学森林生态系统可持续经营教育部重点实验室, 东北亚生物多样性研究中心, 哈尔滨 150040
  • 收稿日期:2023-11-07 接受日期:2024-01-23 出版日期:2024-05-20 发布日期:2024-01-23
  • 通讯作者: (taxus@126.com)
  • 基金资助:
    国家自然科学基金(32071533);黑龙江省自然科学基金(TD2023C006)

Variation and trade-offs in fine root functional traits of seedlings of different mycorrhizal types in mixed broadleaf-Korean pine forests

XU Zi-Yi1, JIN Guang-Ze1,2,*()()   

  1. 1Center for Ecological Research, Northeast Forestry University, Harbin 150040, China
    2Key Laboratory of Sustainable Forest Ecosystem Management, Ministry of Education, Northeast Asia Biodiversity Research Center, Northeast Forestry University, Harbin 150040, China
  • Received:2023-11-07 Accepted:2024-01-23 Online:2024-05-20 Published:2024-01-23
  • Contact: (taxus@126.com)
  • Supported by:
    National Natural Science Foundation of China(32071533);Natural Science Foundation of Heilongjiang Province(TD2023C006)

摘要:

细根是植物在生长发育过程中吸收与运输养分的重要器官, 研究不同菌根类型植物幼苗细根功能性状之间的变异与权衡有利于更全面地理解植物早期的生存策略。该研究以黑龙江凉水国家级自然保护区阔叶红松(Pinus koraiensis)林内3种丛枝菌根(AM)和3种外生菌根(EM)树种幼苗为研究对象, 通过测定其细根的3个形态性状: 比根长(SRL)、根组织密度(RTD)、根直径(D)与4个化学性状: 全磷(P)含量、全碳(C)含量、全氮(N)含量、碳氮比(C:N), 分析了细根性状在不同菌根类型间、根级间以及根功能模块间的差异及其权衡。结果表明, 与AM幼苗相比, EM幼苗细根具有更大的RTD, 这是由于AM真菌的定植方式会增大细根的体积, 同时提高AM菌根对限制性养分的吸收能力, 而其余性状在两种菌根间无显著差异; AM幼苗细根整体符合资源获取型策略, 而EM则相反; 随着根级增加, 两种菌根幼苗细根的RTD、D均显著增加, SRL则显著减小, 细根的功能从主要负责吸收转变为主要负责运输, 细根的C含量、C:N随之上升, N含量下降; 细根的形态特征与化学计量特征间存在权衡关系, 即根功能模块随根级变化时, 细根的形态性状与化学性状也产生相应改变, 研究结果支持根经济谱假说。

关键词: 细根, 功能性状, 菌根真菌, 幼苗, 根功能模块

Abstract:

Aims Fine roots are important organs for absorbing and transporting nutrients during plant growth and development. Investigating the variation and trade-offs among functional traits of seedling fine roots of different mycorrhizal types is conducive to a more comprehensive understanding of their early survival strategies.

Methods In this study, we analyzed the variation and trade-offs across different mycorrhizal types, root orders and root functional modules. In particular, we measured three morphological traits (specific root length (SRL), root tissue density (RTD), and root diameter (D)), and four chemical traits (total phosphorus (P) content, total carbon (C) content, total nitrogen (N) content, carbon nitrogen ratio (C:N)), in three arbuscular mycorrhiza (AM) and three ectomycorrhiza (EM) tree species seedlings in mixed broadleaf-Korean pine (Pinus koraiensis) forest in the Liangshui National Nature Reserve, Heilongjiang Province.

Important findings The results showed that EM seedling fine roots exhibited higher RTD compared with AM seedlings, potentially due to the colonization patterns of AM fungi which increased root volumes and increased the absorptive capacity of limiting nutrients. Other traits did not differ significantly between the two types of mycorrhiza, with AM seedling roots aligning with a more resource-acquired strategy, in contrast to EM seedlings. As the root order increased, RTD and D of both mycorrhiza-association seedling roots increased significantly, while SRL decreased, indicating a functional shift from absorption to transportation. Concurrently, C content and C:N of roots increased, while the N content of roots decreased with increasing root order. A notable trade-off was observed between morphological and chemical traits of fine roots, suggesting that changes in root functional modules with root order are accompanied by corresponding shifts in root traits. These findings support the root economics spectrum (RES), highlighting the complex interplay between root morphology, chemistry and ecological strategy.

Key words: fine root, functional trait, mycorrhizal fungi, seedling, root functional module