早生和晚生树种的木质部调节和生长对快速变暖的反应

IF 2.6 2区 农林科学 Q1 FORESTRY
Zihao Hu, Liangjun Zhu, Shuguang Liu, Pifeng Lei, Rong Zhang, Paolo Cherubini
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引用次数: 0

摘要

气候变化对森林演替产生了巨大影响。然而,亚热带地区不同演替阶段的树木如何应对气候变暖尚不清楚。在这里,我们比较了亚热带森林中早演替阶段的 Castanea mollissima 和晚演替阶段的 Quercus fabri 的径向生长(RW)和木质部特征,并评估了它们对气候变化的响应。除血管平均面积(MVA)和血管总面积(TVA)、木质部内传导面积百分比(RCTA)、理论水导率(Kh)和木质部特异水导率(Ks)外,C. mollissima 的所有参数(包括 RW、血管数(VN)、血管密度(VD)、血管平均面积(MVA)和血管总面积(TVA)、木质部内传导面积百分比(RCTA)、理论水导率(Kh)和木质部特异水导率(Ks))均显著高于 Q. fabri。在干旱期间,与水力安全和效率相关的两个群集参数之间存在明显的负相关,这表明在干旱条件下 Q. fabri 的水力权衡非常明显。Castanea mollissima 对气候更敏感,比 Q. fabri 更容易出现水力失效。温度和水分条件对 C. mollissima 的水力效率相关参数有正向和负向影响。前一个夏季和冬季的水分条件与这两种植物的径向生长呈显著的负相关和正相关。由于水力策略和物种特征的差异、非生长季和生长季气候之间的权衡以及特定的竞争,普遍变暖的影响并不明显。如果气候继续变暖,C. mollissima 的生长可能会因水力失效的风险增加而显著下降。气候变暖可能会改变物种的寿命和竞争关系,从而加速研究区域的物种更替和森林演替。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Xylem adjustment and growth response of early- and late-successional tree species to rapid warming

Xylem adjustment and growth response of early- and late-successional tree species to rapid warming

Climate changes have dramatically affected forest succession. However, how trees at different successional stages respond to climate warming is unclear in the subtropics. Here, we compared the radial growth (RW) and xylem features of the early-successional stage Castanea mollissima and late-successional stage Quercus fabri in subtropical forests and assessed their response to climate changes. All parameters, including RW, number of vessels (VN), vessel density (VD), mean (MVA) and total (TVA) vessel area, percentage of conductive area within xylem (RCTA), theoretical (Kh) and xylem-specific (Ks) hydraulic conductivity, except for MVA of C. mollissima were significantly higher than those of Q. fabri. During the drought period, a notable adverse correlation between two cluster parameters of Q. fabri, associated with hydraulic safety and efficiency, suggested a pronounced hydraulic trade-off in Q. fabri under drought conditions. Castanea mollissima was more sensitive to climate and more prone to hydraulic failure than Q. fabri. Temperatures and moisture conditions positively and negatively affected the hydraulic efficiency-related parameters of C. mollissima. Moisture conditions in the previous summer and winter were significantly negatively and positively related to the radial growth of both species. The impact of generalized warming was not evident due to variations in hydraulic strategies and species characteristics, trade-offs between non-growing and growing season climates, and specific competition. If climate warming continues, C. mollissima growth will probably significantly decline due to the increasing risk of hydraulic failure. Warming may accelerate species replacement and forest succession in the study area by changing their lifespans and competitive relationships.

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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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