植物生态学报 ›› 2023, Vol. 47 ›› Issue (7): 978-987.DOI: 10.17521/cjpe.2022.0087

• 研究论文 • 上一篇    下一篇

中亚热带同质园不同生活型树种微量元素重吸收效率的差异

张慧玲1, 张耀艺1, 彭清清1, 杨静1, 倪祥银1,2, 吴福忠1,2,*()   

  1. 1福建师范大学湿润亚热带生态-地理过程教育部重点实验室, 福州 350007
    2福建三明森林生态系统国家野外科学观测研究站, 福建三明 365002
  • 收稿日期:2022-03-08 接受日期:2022-09-28 出版日期:2023-07-20 发布日期:2023-07-21
  • 通讯作者: *吴福忠(wufzchina@fjnu.edu.cn)
  • 基金资助:
    国家自然科学基金(32171641);国家自然科学基金(31922052)

Variations of trace-elements resorption efficiency in leaves of different tree species as affected by life forms in a mid-subtropical common garden

ZHANG Hui-Ling1, ZHANG Yao-Yi1, PENG Qing-Qing1, YANG Jing1, NI Xiang-Yin1,2, WU Fu-Zhong1,2,*()   

  1. 1Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350007, China
    2Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, Fujian 365002, China
  • Received:2022-03-08 Accepted:2022-09-28 Online:2023-07-20 Published:2023-07-21
  • Contact: *WU Fu-Zhong(wufzchina@fjnu.edu.cn)
  • Supported by:
    The National Natural Science Foundation of China(32171641);The National Natural Science Foundation of China(31922052)

摘要:

林木叶片对营养元素的重吸收作用可以减少对外界环境的依赖并适应外界环境的改变, 但相对于关注较多的大量元素, 微量元素重吸收规律仍然未知。因此, 该研究主要比较同一立地条件下不同生活型树种对微量元素的重吸收效率差异。以中亚热带同质园中处于生长旺盛期的8个树种为研究对象, 于2019年8月调查了不同树种成熟叶和衰老叶中微量元素Al、Fe、Mn、Zn和Cu的含量, 并分析元素的重吸收效率, 探索其养分利用策略。结果显示: 常绿树种(包括针叶和阔叶)对Mn、Zn和Cu的重吸收效率均明显高于落叶阔叶树种, 但8个树种对Al和Fe均未表现出明显的元素重吸收特征。相对于其他树种, 马尾松(Pinus massoniana)和樟(Cinnamomum camphora)对Mn的重吸收效率较高(>30%), 米槠(Castanopsis carlesii)、醉香含笑(Michelia macclurei)和无患子(Sapindus saponaria)对Mn的重吸收不明显。樟对Zn的重吸收效率达67%, 鹅掌楸(Liriodendron chinense)对Cu的重吸收效率达52%, 枫香树(Liquidambar formosana)对Zn和Cu表现为在衰老叶中积累(-30%和-23%)。此外, 微量元素重吸收效率与土壤元素含量之间表现出明显的负相关关系, 微量元素的重吸收效率与大量元素重吸收效率之间也存在一定的协同性。这些结果充分证明常绿阔叶树种相对于其他生活型树种对微量元素的重吸收效率更高, 具有更好的微量元素利用效率。

关键词: 养分利用策略, 微量元素, 养分重吸收, 同质园, 亚热带森林

Abstract:

Aims Trees can resorb the nutrients from senescing leaves, which could reduce their dependence on the changing external nutrient availability and improve their adaptability to the environments. Compared with the well addressed macronutrients, however, trace elements have received far less attentions in their resorption efficiency. Therefore, we conducted a field sampling to address the variations in trace element resorption efficiency of the leaves of different tree species with different life forms in a common garden.

Methods In August 2019, we investigated the concentrations of five trace elements (Al, Fe, Mn, Zn, and Cu) in green and senescent leaves of eight tree species in a common garden in mid-subtropical region, and analyzed the resorption efficiency of these elements to explore the nutrient use strategies.

Important findings Evergreen trees (including needleleaf and broadleaf species) exhibited relatively higher resorption efficiencies of Mn, Zn and Cu than deciduous broadleaf trees, although there were insignificant resorption characteristics of Al and Fe regardless of tree species. Higher Mn resorption efficiencies (>30%) were detected in Pinus massoniana and Cinnamomum camphora than in other tree species, while the resorption efficiencies of Mn were insignificant from zero in Castanopsis carlesii, Michelia macclureiand Sapindus saponaria. In contrast, the resorption efficiencies of Zn in Cinnamomum camphoraand Cu in Liriodendron chinensewere 67% and 52% respectively. Liquidambar formosana showed obvious accumulation of Zn and Cu in senescent leaves (-30% and -23%). Moreover, negative correlations were observed between the resorption efficiency of trace elements and the content of corresponding soil elements, and the nutrient resorption efficiency of trace elements displayed synergy relationships with that of major elements. These results strongly suggested that evergreen broadleaf species could develop better nutrient use strategies with more efficient resorption of trace elements than trees of other life forms in this region.

Key words: nutrient use strategy, trace element, nutrient resorption, common garden, subtropical forest