北方永久冻土地区白桦和落叶松对气候变暖的不同用水策略。

IF 3.5 2区 农林科学 Q1 FORESTRY Tree physiology Pub Date : 2024-06-03 DOI:10.1093/treephys/tpae053
Xi Qi, Kerstin Treydte, Matthias Saurer, Keyan Fang, Wenling An, Marco Lehmann, Kunyuan Liu, Zhengfang Wu, Hong S He, Haibo Du, Mai-He Li
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引用次数: 0

摘要

随着气候变暖,大气中的二氧化碳浓度(Ca)不断升高,这对北方森林的内在水分利用效率(iWUE)和径向生长的影响仍然知之甚少。我们测量了落叶松(Larix dahurica)和白桦(Betula platyphylla)的树环纤维素δ13C、δ18O和树环宽度,并分析了它们与气候变量的关系。我们发现,在温暖期,白桦的径向生长显著增加,而落叶松则没有。这两个物种的iWUE增加主要是由于钙的升高,而不是气候变暖。在温暖时期,白桦(而非落叶松)的树环δ13C、δ18O 和夏季最高温度以及蒸汽压力亏损之间呈现出明显的正相关,这表明阔叶白桦对温度变化有强烈的气孔反应。气候变暖引起的白桦径向生长增强主要与保守的用水策略有关。与此相反,落叶松则表现出过度用水的策略。这意味着在气候变暖的永久冻土地区,白桦比落叶松更具优势。
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Contrasting water-use strategies to climate warming in white birch and larch in a boreal permafrost region.

The effects of rising atmospheric CO2 concentrations (Ca) with climate warming on intrinsic water-use efficiency and radial growth in boreal forests are still poorly understood. We measured tree-ring cellulose δ13C, δ18O, and tree-ring width in Larix dahurica (larch) and Betula platyphylla (white birch), and analyzed their relationships with climate variables in a boreal permafrost region of northeast China over past 68 years covering a pre-warming period (1951-1984; base period) and a warm period (1985-2018; warm period). We found that white birch but not larch significantly increased their radial growth over the warm period. The increased intrinsic water-use efficiency in both species was mainly driven by elevated Ca but not climate warming. White birch but not larch showed significantly positive correlations between tree-ring δ13C, δ18O and summer maximum temperature as well as vapor pressure deficit in the warm period, suggesting a strong stomatal response in the broad-leaved birch to temperature changes. The climate warming-induced radial growth enhancement in white birch is primarily associated with a conservative water-use strategy. In contrast, larch exhibits a profligate water-use strategy. It implies an advantage for white birch over larch in the warming permafrost regions.

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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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