比较三个温带物种的年内径向生长与叶片物候的关系

IF 2.6 2区 农林科学 Q1 FORESTRY European Journal of Forest Research Pub Date : 2024-07-11 DOI:10.1007/s10342-024-01718-5
Nipeng Qian, Zhenzhao Xu, Chaojie Song, Chunchao Dong, Zhen Sun, Ying Liu, Zhenyong Deng, Mingzhu Cong, Qijing Liu
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引用次数: 0

摘要

树木一次生长过程和二次生长过程之间复杂的相互作用对于揭示不同树木组织内部的生理联系具有重要意义。在本研究中,我们利用微芯技术,从 2021 年 4 月至 9 月连续监测了中国东北长白山的柯来松、蒙古栎和桦树的年内径向生长。此外,我们还利用现有的叶片物候模型模拟了三个物种叶面积的季节变化。我们的研究结果表明,不同木种的径向生长动态和叶片扩展模式存在很大差异。值得注意的是,松树和桦树的叶片扩张和径向生长在某些阶段是同步的,叶片扩张速度和径向生长速度之间存在显著的正相关。相反,橡树的叶片展开和径向生长并不同步。我们还观察到了韧皮部物候与叶片物候之间的时间差异。具体来说,松树的叶片展开发生在叶壁开始增厚之前,而叶片脱落则发生在木质化停止之后。与次生壁形成开始的时间相比,橡树的叶片展开时间较晚,叶片脱落的时间明显晚于径向生长停止的时间。相比之下,桦树的叶片展开时间早于径向生长开始的时间,木质化停止的时间晚于叶片脱落的时间。这些发现表明,不同木种的生理机制和生存策略存在多样性。我们的研究结果表明,松树和桦树的径向生长似乎在很大程度上依赖于叶片的光合作用,而橡树则更重视碳储存,尤其是在生长季节的早期。这些发现为了解树木生长的复杂机制提供了新的视角,对于预测温带森林未来的物种适宜性至关重要。
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Comparing the intra-annual radial growth of three temperate species as related to leaf phenology

The complex interplay between primary and secondary growth processes in trees holds paramount significance in unraveling the physiological connections within distinct tree tissues. In this study, we continuously monitored the intra-annual radial growth of Pinus koraiensis, Quercus mongolica, and Betula platyphylla in Changbai Mountain of northeast China using microcore techniques from April to September 2021. Additionally, we used existing leaf phenology models to simulate the seasonal variations of leaf area of three species. Our results revealed substantial difference in radial growth dynamics and leaf expansion patterns among the different wood species. Notably, a synchronization between leaf expansion and radial growth was observed in certain phases for pine and birch, with a significant positive correlation between the rates of leaf expansion and radial growth. Conversely, oak exhibited no synchrony between leaf development and radial growth. Temporal disparities between cambial phenology and leaf phenology were observed. Specifically, for pine, leaf unfolding occurred prior to the onset of wall-thickening, while leaf shedding took place after the cessation of lignification. Oak exhibited a delayed leaf unfolding compared to the initiation of secondary wall formation, and leaf shedding notably occurred later than the cessation of radial growth. In contrast, birch displayed an earlier leaf unfolding in comparison to the onset of radial growth, and the cessation of lignification was later than leaf shedding. These findings indicate the diversity in physiological mechanisms and survival strategies among different wood species. Our results suggest that radial growth in pine and birch appears to be heavily reliant on photosynthetic activity of leaves, while oak places greater emphasis on carbon storage, particularly during early growing season. The findings provide new insights into the complex mechanisms of tree growth and are critical for predicting future species suitability in temperate forests.

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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
77
审稿时长
6-16 weeks
期刊介绍: The European Journal of Forest Research focuses on publishing innovative results of empirical or model-oriented studies which contribute to the development of broad principles underlying forest ecosystems, their functions and services. Papers which exclusively report methods, models, techniques or case studies are beyond the scope of the journal, while papers on studies at the molecular or cellular level will be considered where they address the relevance of their results to the understanding of ecosystem structure and function. Papers relating to forest operations and forest engineering will be considered if they are tailored within a forest ecosystem context.
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