植物生态学报 ›› 2025, Vol. 49 ›› Issue (4): 552-561.DOI: 10.17521/cjpe.2024.0307  cstr: 32100.14.cjpe.2024.0307

• 研究论文 • 上一篇    下一篇

海南东寨港红树林植物细根功能性状对不同潮位沉积物养分变化的响应

李梦琦1, 苗灵凤1,2, 李大东1,3, 龙奕帆1, 叶冰冰1, 杨帆1,*()   

  1. 1海南省热带生态环境修复工程研究中心, 海南大学生态学院, 海口 570228
    2海南大学热带农林学院, 海口 570228
    3海南大学生命健康学院, 海口 570228
  • 收稿日期:2024-09-12 接受日期:2025-01-07 出版日期:2025-04-20 发布日期:2025-04-18
  • 通讯作者: * (fanyangmlf6303@163.com)
  • 基金资助:
    海南省重点研发项目(ZDYF2022SHFZ054);海南省自然科学基金(324QN197);国家自然科学基金(32060240);国家自然科学基金(31660165)

Response of mangrove fine root functional traits to sediment nutrient changes at different tide levels in Dongzhaigang, Hainan, China

LI Meng-Qi1, MIAO Ling-Feng1,2, LI Da-Dong1,3, LONG Yi-Fan1, YE Bing-Bing1, YANG Fan1,*()   

  1. 1Center for Eco-Environmental Restoration Engineering of Hainan Province, School of Ecology, Hainan University, Haikou 570228, China
    2School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
    3School of Life and Health Sciences, Hainan University, Haikou 570228, China
  • Received:2024-09-12 Accepted:2025-01-07 Online:2025-04-20 Published:2025-04-18
  • Contact: * (fanyangmlf6303@163.com)
  • Supported by:
    Hainan Province Key Research and Development Project(ZDYF2022SHFZ054);Hainan Province Natural Science Foundation(324QN197);National Natural Science Foundation of China(32060240);National Natural Science Foundation of China(31660165)

摘要: 不同程度潮汐水淹会对红树林沉积物养分及其化学计量特征产生显著影响, 而植物细根功能性状则是应对养分变化的重要策略。然而, 人们对不同潮位下红树林沉积物养分变化与细根功能性状的相关研究缺乏深入认识, 且目前从细根功能性状尺度探究外来与本土红树植物的养分获取策略的研究相对较少。为进一步确定红树林植物细根功能性状对根际沉积物养分变化的响应, 探究其资源利用策略, 该研究以本土物种海莲(Bruguiera sexangula)和外来物种无瓣海桑(Sonneratia apetala)为对象, 基于不同潮位进行细根与根际沉积物取样, 分析不同潮位下两种红树植物细根功能性状与根际沉积物部分养分含量及酶活性的关系。结果表明: 1)外来物种无瓣海桑比本土物种海莲养分获取需求更高, 代谢能力更强, 且两树种均受到一定程度的氮(N)限制。2)在一定范围内, 沉积物N、磷(P)转化速率随着水淹程度升高而显著加快, 沉积物铵态氮(NH4+-N)、硝态氮(NO3--N)、有效磷(AP)含量随着水淹时间增加而增加。3)两物种细根的比根长与沉积物中NO3--N含量显著正相关, 说明沉积物养分有效性的增加对红树植物根系的伸长具有重要促进作用。

关键词: 红树林, 细根, 功能性状, 潮位, 沉积物养分, 营养限制

Abstract:

Aims Different levels of tidal flooding significantly affect mangrove sediment nutrients and stoichiometric characteristics, and plant fine root functional traits are keys strategies to cope with nutrient changes. However, there is a lack of in-depth understanding of the correlation between mangrove sediment nutrient changes and fine root functional traits at different tide levels, and relatively few studies have been conducted to explore the nutrient dynamics in exotic and native mangrove plants from the scale of fine root functional traits.

Methods The present study used native species Bruguiera sexangular and exotic species Sonneratia apetala to sample fine root and rhizosphere sediments at different tide levels. The relationship between fine root functional traits of two mangrove species and the content of nutrients and enzyme activities in rhizosphere sediments was analyzed.

Important findings The results showed that: 1) The exotic species displayed higher nutrient acquisition requirements and more substantial metabolic capacity than the native species, and both species were subjected to a certain degree of nitrogen restriction. 2) Within a certain range, the conversion rates of nitrogen and phosphorus in sediments accelerate significantly with the increase of waterlogging degree, and the contents of ammonium nitrogen, nitrate nitrogen, and available phosphorus in sediments increase with the increase of waterlogging time. 3) The specific root length of fine roots of the two species was significantly positively correlated with the nitrate nitrogen content in the sediment, indicating that the increase of sediment nutrient availability played an important role in promoting the root elongation of mangrove plants. This study can provide basic data and scientific reference for the environmental protection of the mangrove ecosystem and the development and utilization of biological resources.

Key words: mangrove, fine root, functional traits, intertidal elevation, sediment nutrients, nutritional restriction