连续原位水稳定同位素揭示了严重干旱条件下山毛榉根系水分吸收的快速变化。

IF 6.3 1区 生物学 Q1 PLANT SCIENCES
Laura Kinzinger, Simon Haberstroh, Judith Mach, Markus Weiler, Natalie Orlowski, Christiane Werner
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引用次数: 0

摘要

根系水分吸收(RWU)的适应对温带森林树木的抗旱能力至关重要,但有关水源和吸收深度动态的信息很少。在2022年严重干旱期间,对森林Fagus sylvatica土壤和木质部水分的连续原位稳定同位素测量揭示了RWU深度和水龄的逐日变化。木质部水分主要由初夏近期降水组成,而冬季和春季降水在干旱期间的贡献率高达70%,且输送时间(206±60 d)比夏季降水(62±11 d)更长。同时,树木将RWU转移到更深的土层,同时也对个别降水事件做出响应,在2 ~ 4 d内吸收表层的新鲜降水,说明个别降水事件对树木水分动态的重要性。在干旱之前,森林利用了80%的新鲜降水事件,但是
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Continuous In-Situ Water Stable Isotopes Reveal Rapid Changes in Root Water Uptake by Fagus sylvatica During Severe Drought.

Adaptation of root water uptake (RWU) is critical for drought resilience in temperate forest trees, yet information on water sources and uptake depths dynamics is scarce. Continuous in-situ stable isotope measurements in soil and xylem water of Fagus sylvatica during the severe drought 2022 revealed daily changes in RWU depth and water ages. Xylem water comprised mainly recent precipitation in early summer, but winter and spring precipitation contributed up to 70% during drought, with longer transit times (206 ± 60 days) compared to summer precipitation (62 ± 11 days). Concurrently, trees shifted RWU to deeper soil layers while also responding to individual precipitation events by absorbing fresh precipitation from topsoil layers within 2-4 days, demonstrating the significance of individual precipitation events for tree water dynamic. F. sylvatica used > 80% of a fresh precipitation event before drought, but < 20% during recovery, indicating potential drought legacies on precipitation use. Unravelling these rapid dynamics in RWU and water ages offers novel insights into the importance of single and seasonal precipitation events for forest water fluxes.

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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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