寒湿温带森林中共存的环孔树种和散孔树种在茎叶物候学上存在差异

IF 2.7 3区 农林科学 Q1 FORESTRY Dendrochronologia Pub Date : 2024-06-13 DOI:10.1016/j.dendro.2024.126220
Xiao-Han Yin , Ute Sass-Klaassen , Guang-You Hao , Frank Sterck
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引用次数: 0

摘要

叶片和茎的物候是季节性气候下树木生长模式的关键驱动因素,但对物种径向茎生长动态差异的影响研究尚少。在我们的研究中,我们比较了寒冷和潮湿温带森林中五种弥散多孔(DP)和五种环状多孔(RP)共生被子植物物种的叶片物候和茎干物候与基本细胞发育以及年茎干生长。我们的研究结果表明,与 DP 树种相比,RP 树种的叶片展开较晚,但木质部生长启动较早。然而,茎干木质部血管的成熟始于6月,而且DP和RP之间明显同步,这意味着两个功能群的物种都能有效避免春末霜冻可能引发的血管空化。DP物种在整个生长季的茎干生长呈现一个高峰,反映了统一的血管形成模式。相反,RP 树种的茎干生长表现出两个峰值,第一个峰值反映了早期木质部血管的扩张,第二个峰值则与随后晚期木质部纤维和血管的增殖有关。一般来说,从木质部活动开始到细胞完全木质化的生长天数越多的物种,其茎的年生长量越高,而与物种组无关。本文讨论了观察到的 DP 和 RP 树种在叶和茎物候学方面的差异,以及这两个功能群对寒冷和潮湿温带森林气候条件变化的适应潜力。
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Ring- and diffuse-porous tree species coexisting in cold and humid temperate forest diverge in stem and leaf phenology

Leaf and stem phenology are critical drivers of tree growth patterns in seasonal climates, but the implications for species differences in radial stem growth dynamics are still poorly studied. In our study, we compared the leaf phenology and stem phenology with the underlying cell development as well as annual stem growth between five diffuse-porous (DP) and five ring-porous (RP) coexisting angiosperm species in cold and humid temperate forests. Our results show that RP species unfolded leaves later but initiated wood growth earlier compared to DP species. Yet, xylem vessel maturation in the stem started in June and was remarkably synchronized between DP and RP, which implies that species from both functional groups can effectively avoid vessel cavitation potentially triggered by late spring frost. DP species exhibited one peak in stem growth across the growing season reflecting a uniform vessel formation pattern. Instead, RP species exhibited two peaks in stem growth, with the first peak reflecting expansion of early-wood vessels and the second peak related to subsequent fiber and vessel proliferation in the late-wood. In general, species with a greater number of growth days from the start of cambium activity until full lignification of cells exhibited higher annual stem growth, regardless of species group. The observed differences in leaf and stem phenology between DP and RP species are discussed with respect to the adaptation potential of the two functional groups to changing climate conditions in cold and humid temperate forests.

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来源期刊
Dendrochronologia
Dendrochronologia FORESTRY-GEOGRAPHY, PHYSICAL
CiteScore
5.50
自引率
13.30%
发文量
82
审稿时长
22.8 weeks
期刊介绍: Dendrochronologia is a peer-reviewed international scholarly journal that presents high-quality research related to growth rings of woody plants, i.e., trees and shrubs, and the application of tree-ring studies. The areas covered by the journal include, but are not limited to: Archaeology Botany Climatology Ecology Forestry Geology Hydrology Original research articles, reviews, communications, technical notes and personal notes are considered for publication.
期刊最新文献
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