用于生长细根的碳的14c年龄反映了树木的碳状态。

IF 6.3 1区 生物学 Q1 PLANT SCIENCES
Boaz Hilman, Emily F Solly, Frank Hagedorn, Iris Kuhlman, David Herrera-Ramírez, Susan Trumbore
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引用次数: 0

摘要

从碳固定成非结构性碳水化合物(NSC)到它们被用来生长树木结构组织之间所经过的时间可以用14C年龄来估计。报道的14c年龄表明,用于生长根组织(生长NSC)的两种针叶树(落叶落叶松,松)的叶片、分支和根组织的14c年龄可能不同,这两种针叶树(落叶落叶松,松)位于对照谷地和低温限制树木生长的高山林木线过渡带。我们的研究结果表明,随着过渡带的升高,呼吸速率和NSC浓度增加,C的同化超过了生长,新鲜NSC的供应增加。新鲜NSC通过针叶和树枝的大量流动可以解释其细根的年轻生长NSC (14c -年龄)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
14C-Age of Carbon Used to Grow Fine Roots Reflects Tree Carbon Status.

The time elapsed between carbon fixation into nonstructural carbohydrates (NSC) and their use to grow tree structural tissues can be estimated by 14C ages. Reported 14C-ages indicate that NSC used to grow root tissues (growth NSC) can vary from < 1 year to decades. To understand the controls of this variability, we compared 14C-ages of leaf, branch, and root tissues from two conifers (Larix decidua, Pinus mugo) in a control valley site and an alpine treeline ecotone where low temperatures restrict tree growth. Our results of increasing respiration rate and NSC concentration with ecotone elevation suggest an excess of C assimilation over growth and an increase in fresh NSC supply. Greater flow of fresh NSC through needles and branches could explain their young growth NSC (< 2 years). A smaller inflow of fresh NSC into roots could explain older growth NSC ages, which increased from 2 to 10 years from the valley to the bottom of the ecotone, and then declined to 6 years at the ecotone top. Rather than species differences that were small, environmental conditions over years appear to be the primary driver of C allocation dynamics, which are reflected in the 14C-ages of fine roots.

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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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