广西师范大学学报（自然科学版） ›› 2026, Vol. 44 ›› Issue (2): 238-252.doi: 10.16088/j.issn.1001-6600.2025033001

• 生态环境科学研究 • 上一篇    下一篇

旱季喀斯特檵木克隆整合对叶片和根系养分的影响

何浩勇1,2,3, 刘宁1,2,3, 莫燕华1,2,3, 杨新亮1,2,3, 谢小丽1,2,3, 罗成杰1,2,3, 莫奕雯1,2,3, 张玉扬1,2,3, 马姜明1,2,3*   

  1. 1.珍稀濒危动植物生态与环境保护教育部重点实验室(广西师范大学),广西 桂林 541006;
    2.广西漓江流域景观资源保育与可持续利用重点实验室(广西师范大学),广西 桂林 541006;
    3.广西师范大学 可持续发展创新研究院,广西 桂林 541006
  • 收稿日期:2025-03-30 修回日期:2025-04-20 发布日期:2026-02-03
  • 通讯作者: 马姜明(1976—),男,江西永新人,广西师范大学教授,博士。E-mail: mjming03@gxnu.edu.cn
  • 基金资助:
    国家自然科学基金区域创新发展联合基金重点支持项目(U21A2007);桂林市科技计划项目(20230102-6,20230102-7);广西高校中青年教师科研基础能力提升项目(2025KY0096)

Effects of Clonal Integration of Loropetalum chinenseon Leaf and Root Nutrients in Karst Dry Season

HE Haoyong1,2,3, LIU Ning1,2,3, MO Yanhua1,2,3, YANG Xinliang1,2,3, XIE Xiaoli1,2,3, LUO Chengjie1,2,3, MO Yiwen1,2,3, ZHANG Yuyang1,2,3, MA Jiangming1,2,3*   

  1. 1. Key Laboratory of Rare and Endangered Animal and Plant Ecology and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin Guangxi 541006, China;
    2. Key Laboratory of Landscape Resource Conservation and SustainableUtilization in the Lijiang River Basin of Guangxi (Guangxi Normal University), Guilin Guangxi 541006, China;
    3. Institute forSustainable Development and Innovation, Guangxi Normal University, Guilin Guangxi 541006, China
  • Received:2025-03-30 Revised:2025-04-20 Published:2026-02-03

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摘要： 檵木Loropetalum chinense是漓江流域喀斯特植被恢复优势树种,基于其克隆生长特性,檵木能够很好地适应异质性生境。本研究基于空间代替时间方法,以漓江流域喀斯特石山生境旱季檵木群落不同演替阶段(灌木、乔灌和乔木阶段)的克隆植物檵木为研究对象,分析母株、子株和未克隆植株的叶片、根系和根际土壤碳(C)、氮(N)、磷(P)含量变化特征,并结合檵木养分和根际土壤理化性质,探讨旱季演替阶段变化及克隆整合对檵木叶片和根系养分的影响。结果表明:1)檵木叶片C、N、P和根系C、P含量随演替阶段变化显著提高。克隆整合作用对檵木叶片含水率,叶片C、N含量和根系C、P含量影响显著,其中灌木阶段未克隆植株根系C含量相较克隆母株和子株分别高5.83%和5.24%,乔木阶段分别高1.3%和0.5%;乔木阶段未克隆植株根系P含量相较母株和子株分别高120.86%和75.64%。 2)檵木叶片和根系养分分配差异显著,含水率及C、N、P含量均为叶片显著高于根系。群落演替和克隆整合对C、P养分分配影响显著,乔木阶段母株与子株较未克隆植株向叶片输送更多的C、P养分,而在灌木和乔灌阶段养分分配无显著差异。3)克隆整合与演替阶段变化影响下,灌木和乔木阶段植株与根际土壤的互作强度显著高于乔灌阶段,母株互作强度显著高于子株和未克隆植株。灌木阶段根际土壤pH、碱解氮(HN)、全磷(TP)和速效磷(AP)与檵木养分正相关、与pH为负相关;乔木阶段根际土壤有机碳(SOC)、全氮(TN)、HN、TP和AP与檵木养分正相关。本研究表明,檵木群落自然演替和克隆整合作用对檵木叶片和根系养分及根际土壤具有一定影响,对灌木和乔灌阶段檵木需要改善土壤pH及增加N、P养分的供给;而乔木阶段的养分循环受喀斯特地区高钙镁和高pH限制,需要改善土壤pH以帮助利用土壤养分。

关键词: 檵木, 克隆整合, 叶片养分, 根系养分, 喀斯特

Abstract: Loropetalum chinense is the dominant tree species for karst vegetation restoration in Lijiang River Basin. Based on its clonal growth characteristics, L. chinense can well adapt to heterogeneous habitats. To investigate the impacts of clonal integration on leaf and root nutrient contents in L. chinense, this study employed a space-for-time substitution approach, focusing on L. chinense in dry-season habitats across different successional stages (shrub, shrub-tree, and tree stages) in karst rocky mountainous areas of the Li River Basin. Analyzed variations in carbon (C), nitrogen (N), and phosphorus (P) contents in leaves, roots, and rhizosphere soil of mother ramets, daughter ramets, and non-clonal plants. The interactions between plant nutrient status, rhizosphere soil physicochemical properties, and their responses to successional stage changes and clonal integration during the dry season were further explored. The results demonstrated that: 1) Leaf C, N, P and root C, P contents of L. chinense increased significantly with successional progression. Clonal integration significantly affected leaf water content, leaf C, N contents, and root C, P contents. Notably, non-clonal plants exhibited 5.83% and 5.24% higher root C content compared with mother and daughter ramets in the shrub stage, and 1.3% and 0.5% higher in the tree stage, respectively. Root P content of non-clonal plants in the tree stage was 120.86% and 75.64% higher than that of mother and daughter ramets. 2) Significant nutrient differences existed between leaves and roots, with water content, C, N, and P contents being significantly higher in leaves than in roots, except for occasional non-significant differences in C and P contents. The effects of succession stage and clonal integration on C and P nutrient distribution were significant. In the tree stage, the mother ramets and daughter ramets transported more C and P nutrients to the leaves than the uncloned plants, but there was no significant difference in nutrient distribution between shrub and tree-shrub stages. 3) Under combined effects of clonal integration and successional changes, plant-rhizosphere soil interaction was significantly stronger in shrub and tree stages than in the shrub-tree stage, with mother ramets showing higher interaction intensity than daughter ramets and non-clonal plants. The rhizosphere soil pH, available nitrogen (HN), total phosphorus (TP) and available phosphorus (AP) in the shrub stage were positively correlated with the nutrients of L. chinense, and the pH was negatively correlated. The rhizosphere soil organic carbon (SOC), total nitrogen (TN), HN, TP and AP were positively correlated with the nutrients of L. chinense at the tree stage. This study showed that the natural succession and clonal integration of L. chinense community had a certain influence on the leaf and root nutrients and rhizosphere soil of L. chinense. For L. chinense in shrub and tree-shrub stages, it was necessary to improve soil pH and increase the supply of N and P nutrients. The tree stage is limited by the high calcium and magnesium high pH in the karst area, and its soil pH needs to be improved to help use soil nutrients.

Key words: Loropetalum chinense, clonal integration, leaf nutrient, root nutrient, karst

中图分类号:  Q948

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