植物生态学报 ›› 2023, Vol. 47 ›› Issue (11): 1471-1482.DOI: 10.17521/cjpe.2022.0326

所属专题: 全球变化与生态系统 根系生态学

• 综述 •    下一篇

增温对林木细根物候影响的研究进展

陈心怡1,2,3, 吴晨1,2,3, 黄锦学2, 熊德成1,2,3,*()   

  1. 1福建师范大学福建省植物生理生态重点实验室, 福州 350007
    2福建师范大学地理科学学院, 福州 350007
    3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:2022-08-11 接受日期:2023-03-13 出版日期:2023-11-20 发布日期:2023-03-16
  • 通讯作者: 熊德成(xdc104@163.com)
  • 基金资助:
    国家自然科学基金(32071743);国家自然科学基金(32192433);福建省科技厅公益类项目(2022R1002004)

Effects of warming on fine root phenology of forests: a review

CHEN Xin-Yi1,2,3, WU Chen1,2,3, HUANG Jin-Xue2, XIONG De-Cheng1,2,3,*()   

  1. 1Fujian Provincial Key Laboratory for Plant Eco-physiology, Fujian Normal University, Fuzhou 350007, China
    2School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
    3Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, Fujian 365002, China
  • Received:2022-08-11 Accepted:2023-03-13 Online:2023-11-20 Published:2023-03-16
  • Contact: XIONG De-Cheng(xdc104@163.com)
  • Supported by:
    National Natural Science Foundation of China(32071743);National Natural Science Foundation of China(32192433);Public Welfare Projects of Science and Technology Department of Fujian Province(2022R1002004)

摘要:

林木细根物候是观测全球变暖影响的重要指标。全球变化背景下, 细根物候不仅反映林木的生长状况变化, 也揭示着陆地生态系统碳循环和地下碳分配动态。林木细根物候对气候变化的响应是全球变化研究的热点和难点, 国内外已开展了大量研究工作, 目前部分研究认为土壤增温将延长林木细根的物候期, 并且北半球一些地区春季物候期、生长高峰期均提前, 而大气增温有可能抑制细根生长, 推迟其物候期, 此外还有研究发现表层土壤中的根系物候受增温的影响可能比深层根系更大。同时, 一些学者将细根物候与根际土壤环境、微生物和地上物候几个方面相联系以研究其响应机制, 但细根物候如何响应气候变暖以及这些响应可能的机制仍未有定论。为此, 该文系统阐述了全球变暖背景下林木细根物候的研究进展, 以期为地下物候学研究以及林木对全球变化的响应和适应机制研究提供参考, 并认为今后还需加强以下几个方面的研究: 1)改进和探索更精确的模拟增温方式并开展更长时间尺度的量化研究; 2)探究变化环境下林木根系不同功能模块(如吸收根/运输根, 纤维根/先锋根)与其物候的联系, 即将“环境-性状-物候”相关联; 3)综合考虑根系物候的控制因素在不同地下物候相(根系生长开始、生长峰值、生长停止)、物种、土层的差异性; 4)关注地下、地上物候相互关联及其对植物生产力影响的研究; 5)增温与其他环境因子(CO2浓度、氮沉降等)综合作用下的林木地下物候与生态系统功能变化(如碳汇、养分循环等)间联系应是未来研究的重点方向。

关键词: 全球变暖, 细根动态, 物候, 地下碳分配, 垂直分布

Abstract:

The fine root phenology of forests is an important indicator to observe the impact of global warming. It can reflect not only the growth status of forests under the background of global change but also the dynamics of the carbon cycle and below-ground carbon distribution of terrestrial ecosystems. Meanwhile, the response of forest fine root phenology to climate change is considered a hotspot and challenge in the field of global change effects, and thus has been studied extensively. Recent studies claim that soil warming will prolong the growing season of fine roots in forests as the spring phenology and growth peak will begin earlier in some areas of the northern hemisphere, however, atmospheric warming may inhibit the growth of fine roots and delay the phenological events. In addition, some studies found that the root phenology in the surface soil may be more affected by warming than that in the deep layer. Concurrently, some researchers associated fine root phenology with rhizosphere soil environment, microorganisms and above-ground phenology to reveal the response mechanism. However, the response of fine root phenology to climate warming and its underlying mechanisms have not been fully explained. This paper systematically reviewed changes in fine root phenology in forests under global warming, and aimed to provide references for the research on below-ground phenology, and the response and adaptation mechanism of forests to global changes. Future studies should enhance the research on the following aspects: 1) improving and exploring more accurate simulation warming devices and carrying out long-term quantitative research; 2) exploring the relationship between different functional modules of roots (such as absorbing root/transporting root, fibrous root/pioneering root) and their phenology under changing environments, i.e. “environment-traits- phenology”; 3) considering variations of the control factors of root phenology under different below-ground phenological phases (the beginning, peak and end of root growth), species and soil layers; 4) focusing on the relationship between below- and above-ground phenology, and its impacts on plant productivity; 5) focus on the changes of forest below-ground phenology and ecosystem functions (such as carbon sinks, nutrient cycling, etc.) under the combined effect of warming and other environmental factors (CO2 concentration, nitrogen deposition, etc.).

Key words: global warming, fine root dynamics, phenology, below-ground carbon allocation, vertical distribution