树环纤维素中的三重同位素分析表明,树种混杂对银冷杉和花旗松的气候敏感性影响不大。

IF 3.5 2区 农林科学 Q1 FORESTRY Tree physiology Pub Date : 2024-07-02 DOI:10.1093/treephys/tpae067
Justine Charlet de Sauvage, Kerstin Treydte, Matthias Saurer, Mathieu Lévesque
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引用次数: 0

摘要

厘清影响树木气候敏感性的因素对于了解森林对气候变化的敏感性至关重要。减少树与树之间的竞争和混合树种是经常提倡的降低树木干旱敏感性的两种策略,但目前还不清楚这些措施在不同生态系统中的效果如何。在这里,我们研究了瑞士三个地点在纯林和混交条件下生长的银冷杉和花旗松对气候和严重干旱的生长和生理反应。我们利用树环宽度(TRW)数据和树环纤维素中的碳(δ13C)、氧(δ18O)和氢(δ2H)稳定同位素比值,获得了树木对干旱的水分关系和生理反应以及树种混合和竞争如何调节这些反应的新信息。我们发现,生长在纯净和混合条件下的两种树种的同位素比值存在明显差异,尽管这些差异在不同地点有所不同,例如,在两个地点,生长在混合条件下的树种比生长在纯净条件下的树种具有更高的δ13C值和TRW。对于这两个物种而言,纯净条件下和混合条件下的树木对温度、降水、气候水分平衡和蒸气压差(VPD)的敏感性差异很小。此外,生长在纯净和混合条件下的树木对过去2003年、2015年和2018年严重干旱的TRW和同位素比率表现出相似的反应。竞争只对银冷杉的δ13C产生了明显的负面影响,这可能表明由于对光和养分的竞争加剧,光合作用有所下降。我们的研究强调,树种混交对银冷杉和花旗松的径向生长和对气候条件的生理反应可能只有中等程度的影响,而场地条件的影响可能比混交的影响更主要。
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Triple-isotope analysis in tree-ring cellulose suggests only moderate effects of tree species mixture on the climate sensitivity of silver fir and Douglas-fir.

Disentangling the factors influencing the climate sensitivity of trees is crucial to understanding the susceptibility of forests to climate change. Reducing tree-to-tree competition and mixing tree species are two strategies often promoted to reduce the drought sensitivity of trees, but it is unclear how effective these measures are in different ecosystems. Here, we studied the growth and physiological responses to climate and severe droughts of silver fir and Douglas-fir growing in pure and mixed conditions at three sites in Switzerland. We used tree-ring width data and carbon (δ13C), oxygen (δ18O) and hydrogen (δ2H) stable isotope ratios from tree-ring cellulose to gain novel information on water relations and the physiology of trees in response to drought and how tree species mixture and competition modulate these responses. We found significant differences in isotope ratios between trees growing in pure and mixed conditions for the two species, although these differences varied between sites, e.g. trees growing in mixed conditions had higher δ13C values and tree-ring width than trees growing in pure conditions for two of the sites. For both species, differences between trees in pure and mixed conditions regarding their sensitivity to temperature, precipitation, climatic water balance and vapor pressure deficit were minor. Furthermore, trees growing in pure and mixed conditions showed similar responses of tree-ring width and isotope ratios to the past severe droughts of 2003, 2015 and 2018. Competition had only a significantly negative effect on δ13C of silver fir, which may suggest a decrease in photosynthesis due to higher competition for light and nutrients. Our study highlights that tree species mixture may have only moderate effects on the radial growth and physiological responses of silver fir and Douglas-fir to climatic conditions and that site condition effects may dominate over mixture effects.

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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.
期刊最新文献
Capturing drought stress signals: The potential of dendrometers for monitoring tree water status. A process-based model of climate-driven xylogenesis and tree-ring formation in broad-leaved trees (BTR). Dormancy characteristics of lammas-growth seedlings of subtropical trees and their phenological responses to experimental warming. Initial stomatal conductance increases photosynthetic induction of trees leaves more from sunlit than from shaded environments: a meta-analysis. Isotopic steady state or non-steady state transpiration? Insights from whole-tree chambers.
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