东方栓皮栎(Quercus variabilis Bl.)枝叶栓塞阻力和水力电容的季节性共同介导水力安全。

IF 3.5 2区 农林科学 Q1 FORESTRY
Xin Huang, Zhuo-Liang Hou, Bo-Long Ma, Han Zhao, Zai-Min Jiang, Jing Cai
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引用次数: 0

摘要

在气候变异加剧的时代,温带地区的季节性非常突出。能够适应季节性变化的气候条件的水力特性对树木的安全至关重要。然而,人们很少关注骨干林木干旱相关性状的种内季节性和水力安全性。我们研究了在中国温带森林中占主导地位的东方栓皮栎(Quercus variabilis Bl.)的主要形态和生理性状以及枝叶水平的多重水力安全系数(SMs)的季节性变化。气动测量结果表明,随着季节的变化,50%的枝条栓塞发生时的水势(P50_branch)从-3.34 兆帕下降到-4.23 兆帕,变异系数(CV)为 9.08%。边材容重范围为 48.19-248.08 kg m-3 MPa-1,秋季达到最高,冬季达到最低(变异系数为 60.58%)。再水化动力学证实,春秋两季的叶片易栓塞性(P50_leaf)高于夏季,其数值范围为-1.06 兆帕至-3.02 兆帕(CV 为 39.85%)。所有叶片压力-体积(PV)性状都随生长而变化,CV 值范围为 6.95-46.69%。边材密度与 P50_branch 和弹性储水液压容积呈显著负相关,而叶片单位面积质量与 PV 特性呈线性相关,但与 P50_leaf 无关。此外,树枝的典型SMs(树枝正午水势与P50_branch之间的差值)始终大于1.84 MPa,而且整个树枝普遍存在脆弱分段现象,这意味着变叶桉占优势的水力基础是可信的。不同季节存在不同的水力反应模式,导致上述生理特征介导的正安全系数。虽然变种鹅表现出较高的水力安全水平,但由于全球气候变化,其对夏季突发性干旱的易感性可能会增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seasonality in embolism resistance and hydraulic capacitance jointly mediate hydraulic safety in branches and leaves of oriental cork oak (Quercus variabilis Bl.).

Seasonality in temperate regions is prominent during the era of increased climatic variability. A hydraulic trait that can adjust to seasonally changing climatic conditions is crucial for tree safety. However, little attention has been paid to the intraspecific seasonality of drought-related traits and hydraulic safety of keystone forest trees. We examined seasonal variations in the key morphological and physiological traits as well as multiple hydraulic safety margins (SMs) at the branch and leaf levels in oriental cork oak (Quercus variabilis Bl.), which is predominant in Chinese temperate forests. Pneumatic measurements indicated that, as seasons progressed, the water potential at which 50% of branch embolisms occur (P50_branch) decreased from -3.34 to -4.23 MPa, with a coefficient of variation (CV) of 9.08%. Sapwood capacitance ranged from 48.19 to 248.08 kg m-3 MPa-1, peaking in autumn and reaching minimum in winter (CV 60.58%). Rehydration kinetics confirmed higher leaf embolism vulnerability (P50_leaf) in spring and autumn than those in summer, with values ranging from -1.06 to -3.02 MPa (CV 39.85%). All leaf pressure-volume (PV) traits shifted with growth, with CVs ranging from 6.95% to 46.69%. Sapwood density had significant negative correlations with P50_branch and hydraulic capacitance for elastic water storage, whereas leaf mass per area was linearly associated with PV traits but not with P50_leaf. Furthermore, the branch typical SMs (difference between branch midday water potential and P50_branch) were consistently >1.84 MPa, and vulnerability segmentation was prevalent throughout, implying a plausible hydraulic foundation for the dominance of Q. variabilis. Diverse hydraulic response patterns existed across seasons, leading to positive SMs mediated by the aforementioned physiological traits. Although Q. variabilis exhibits a high level of hydraulic safety, its susceptibility to sudden summer droughts may increase due to global climate change.

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来源期刊
Tree physiology
Tree physiology 农林科学-林学
CiteScore
7.10
自引率
7.50%
发文量
133
审稿时长
1 months
期刊介绍: Tree Physiology promotes research in a framework of hierarchically organized systems, measuring insight by the ability to link adjacent layers: thus, investigated tree physiology phenomenon should seek mechanistic explanation in finer-scale phenomena as well as seek significance in larger scale phenomena (Passioura 1979). A phenomenon not linked downscale is merely descriptive; an observation not linked upscale, might be trivial. Physiologists often refer qualitatively to processes at finer or coarser scale than the scale of their observation, and studies formally directed at three, or even two adjacent scales are rare. To emphasize the importance of relating mechanisms to coarser scale function, Tree Physiology will highlight papers doing so particularly well as feature papers.
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