Nearly instantaneous stem diameter response to fluctuations in the atmospheric water demand.

IF 3.5 2区 农林科学 Q1 FORESTRY
Roberto L Salomón, Jaime Puértolas, José Carlos Miranda, Pilar Pita
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引用次数: 0

Abstract

Changes in vapour pressure deficit can lead to the depletion and replenishment of stem water pools to buffer water potential variations in the xylem. Yet, the precise velocity at which stem water pools track environmental cues remains poorly explored. Nine eucalyptus seedlings grown in a glasshouse experienced high-frequency environmental oscillations and their stem radial variations (ΔR) were monitored at a 30-s temporal resolution in upper and lower stem locations and on the bark and xylem. The stem ΔR response to vapour pressure deficit changes was nearly instantaneous (<1 min), while temperature lagged behind stem ΔR. No temporal differences in the stem ΔR response were observed between locations. Punctual gravimetric measurements confirmed the synchrony between transpiration and stem ΔR dynamics. These results indicate (i) that stem-stored water can respond to the atmospheric evaporative demand much faster than commonly assumed and (ii) that the origin of the water released to the transpiration stream seems critical in determining time lags in stem water pool dynamics. Near-zero time lags may be explained by the high elasticity of eucalyptus woody tissues and the predominant water use from the xylem, circumventing the hydraulic radial barriers to water flow from/to the outer tissues.

茎干直径对大气需水量波动的反应近乎瞬时。
蒸气压差(VPD)的变化会导致茎干水池的消耗和补充,以缓冲木质部的水势变化。然而,对茎干水池跟踪环境线索的精确速度仍缺乏深入研究。在玻璃温室中生长的九株桉树幼苗经历了高频环境振荡,它们的茎干径向变化(ΔR)在茎干上部和下部位置以及树皮和木质部受到了30秒时间分辨率的监测。茎杆ΔR对VPD变化的反应几乎是瞬时的(< 1分钟),而温度则滞后于茎杆ΔR。不同地点的茎干 ΔR 反应没有时间上的差异。准时重力测量证实了蒸腾作用和茎ΔR动态之间的同步性。这些结果表明:(i) 茎干储存的水对大气蒸发需求的响应速度比通常假设的要快得多;(ii) 释放到蒸腾流中的水的来源似乎是决定茎干水池动态时滞的关键。桉树木质组织的高弹性和木质部的主要用水量,绕过了水流进出外部组织的径向水力障碍,可以解释近乎零的时滞。
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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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