染料示踪剂辅助木质部输水速度分布的研究

IF 5.7 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Stefan Seeger, Markus Weiler
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引用次数: 0

摘要

摘要绝大多数利用稳定水同位素研究土壤中根系水分吸收源深度的研究隐含地假设了根系水分吸收和木质部水分的同位素特征是相同的。在这项研究中,我们表明这一基本假设并不一定有效,因为植物木质部内的水运输不是瞬时的。然而,据我们所知,还没有研究试图明确评估木质部内水输送速度的分布。通过染料示踪实验,我们能够直观地看到水在木质部中的运输是如何在很大范围内发生的,这些速度在木质部中的分布是不均匀的。在另一个虚拟实验中,我们可以证明,由于整个木质部的传输速度分布不均匀,不同的稳定水同位素采样方法可能有效地导致木质部水样具有不同的底层年龄分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dye-tracer-aided investigation of xylem water transport velocity distributions
Abstract. The vast majority of studies investigating the source depths in the soil of root water uptake with the help of stable water isotopes implicitly assumes that the isotopic signatures of root water uptake and xylem water are identical. In this study we show that this basic assumption is not necessarily valid, since water transport within a plant's xylem is not instantaneous. However, to our knowledge, no study has yet tried to explicitly assess the distribution of water transport velocities within the xylem. With a dye tracer experiment, we were able to visualize how the transport of water through the xylem happens at a wide range of velocities which are distributed unequally throughout the xylem. In an additional virtual experiment we could show that, due to the unequal distribution of transport velocities throughout the xylem, different sampling approaches of stable water isotopes might effectively lead to xylem water samples with different underlying age distributions.
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来源期刊
Hydrology and Earth System Sciences
Hydrology and Earth System Sciences 地学-地球科学综合
CiteScore
10.10
自引率
7.90%
发文量
273
审稿时长
15 months
期刊介绍: Hydrology and Earth System Sciences (HESS) is a not-for-profit international two-stage open-access journal for the publication of original research in hydrology. HESS encourages and supports fundamental and applied research that advances the understanding of hydrological systems, their role in providing water for ecosystems and society, and the role of the water cycle in the functioning of the Earth system. A multi-disciplinary approach is encouraged that broadens the hydrological perspective and the advancement of hydrological science through integration with other cognate sciences and cross-fertilization across disciplinary boundaries.
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