茎干脆弱性曲线与树木形态之间的联系及其对植物生理建模的影响。

IF 3.5 2区 农林科学 Q1 FORESTRY
Chaoqing Song, Yangyang Fu, Shidan Zhu, Wenfang Xu, Qing Ye, Wenping Yuan
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引用次数: 0

摘要

脆弱性曲线(VCs)已被广泛测量,用于描述植物对气蚀的脆弱性差异。虽然水力传导性(Ks,max)和水力安全性(P50,抗栓塞性)都是 VCs 的参数('sigmoidal'类型),在不同森林中对其在树木分布中的作用进行了评估,但很少有人探讨 VCs 与树木分布之间的直接联系。在这项研究中,我们结合巴拿马季节性热带森林中 16 种树木的测量 VCs 和小区数据,研究了 VCs 与树木死亡率、新陈代谢和生长之间的联系。我们发现,常绿树种的死亡率和更新率与 P50 呈显著正相关。然而,落叶树种的死亡率和新梢长出率只与参数 a 呈显著正相关,参数 a 描述了 VCs 的陡度,表明了电导率损失对水势下降的敏感性,但往往被忽视。常绿树种和落叶树种之间的这些差异可能是导致现有定量关系(如所有 16 个树种的拟合关系)在捕捉树木死亡和更新动态方面表现不佳的原因。此外,常绿树种的相对生长速率(RGR)与 Ks,max 呈显著正相关,而落叶树种则没有这种关系。进一步的分析表明,具有较陡VC的物种往往具有较高的死亡率和新陈代谢率,而具有较平坦VC的物种通常具有较低的死亡率和新陈代谢率。我们的研究结果突显了参数a在树木繁殖中的重要作用,尤其是对落叶物种而言。鉴于VC是植物水力模型的关键组成部分,整合测量到的VC而不是优化其参数将有助于提高模拟和预测森林对水分供应反应的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Linkages between stem vulnerability curves and tree demography and their implications for plant physiological modeling.

Vulnerability curves (VCs) have been measured extensively to describe the differences in plant vulnerability to cavitation. Although the roles of hydraulic conductivity (Ks,max) and hydraulic safety (P50, embolism resistance), both of which are parameters of VCs ('sigmoidal' type), in tree demography have been evaluated across different forests, the direct linkages between VCs and tree demography are rarely explored. In this study, we combined measured VCs and plot data of 16 tree species in Panamanian seasonal tropical forests to investigate the connections between VCs and tree mortality, recruitment and growth. We found that the mortality and recruitment rates of evergreen species were most significantly positively correlated with P50. However, the mortality and recruitment rates of deciduous species only exhibited significant positive correlations with parameter a, which describes the steepness of VCs and indicates the sensitivity of conductivity loss with water potential decline, but is often neglected. These differences among evergreen and deciduous species may contribute to the poor performance of existing quantitative relationships (such as the fitting relationships for all 16 species) in capturing tree mortality and recruitment dynamics. Additionally, evergreen species presented a significant positive relationship between relative growth rate (RGR) and Ks,max, while deciduous species did not display such relationship. The RGR of both evergreen and deciduous species also displayed no significant correlations with P50 and a. Further analysis demonstrated that species with steeper VCs tended to have high mortality and recruitment rates, while species with flatter VCs were usually those with low mortality and recruitment rates. Our results highlight the important role of parameter a in tree demography, especially for deciduous species. Given that VC is a key component of plant hydraulic models, integrating measured VC rather than optimizing its parameters will help improve the ability to simulate and predict forest response to water availability.

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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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