14C-Age of Carbon Used to Grow Fine Roots Reflects Tree Carbon Status.

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

Abstract

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.

用于生长细根的碳的14c年龄反映了树木的碳状态。
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。
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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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