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首页> 外文期刊>Plant Ecology >Climatic responses of tree-ring width and delta C-13 signatures of sessile oak (Quercus petraea Liebl.) on soils with contrasting water supply
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Climatic responses of tree-ring width and delta C-13 signatures of sessile oak (Quercus petraea Liebl.) on soils with contrasting water supply

机译:供水相对的土壤上无梗橡树(栎栎)的树轮宽度和δ13签名的气候响应

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摘要

We investigated climate-growth relationships (in terms of tree-ring width, basal area increment (BAI), and tree-ring delta C-13 signatures) of Quercus petraea in Central Europe (Luxembourg). Tree responses were assessed for 160 years and compared for sites with contrasting water supply (i.e. Cambisols vs. Regosols with 175 and 42 mm available water capacity, respectively). Oak trees displayed very low climate sensitivity, and climatic variables explained only 24 and 21 % of variance in tree-ring width (TRW) (Cambisol and Regosol sites, respectively). Contrary to our expectations, site-related differences in growth responses (i.e. BAI, delta C-13 signatures) to climate shifts were not significant. This finding suggests a high plasticity of oak trees in the study area. Despite a distinct growth depression found for all trees in the decade 1988-1997 (attributable to increasing annual mean temperatures by 1.1 A degrees C), oak trees completely recovered in subsequent years. This indicates a high resilience of sessile oak to climate change. Shifts in delta C-13(corr) signatures were mainly affected by temperature, and peaks in delta C-13(corr) values (corrected for the anthropogenic increase in atmospheric CO2) coincided with decadal maximum temperatures. Correlations between delta C-13 signatures and TRW (mainly affected by precipitation) were not significant. This finding suggests that wood growth often was disconnected from carbon assimilation (e.g. due to carbon storage in the trunk or allocation to seeds). Since the selection of drought-resistant tree species gains importance within the context of adaptive forest management strategies, Q. petraea proves to be an adaptive tree species in Central Europe's forests under shifting climatic conditions.
机译:我们调查了中欧(卢森堡)栎属栎的气候-生长关系(根据树年轮宽度,基面积增加(BAI)和树年轮三角洲C-13特征)。对树木的响应进行了160年的评估,并比较了供水情况相反的地方(即分别具有175和42毫米可用水容量的坎比索尔与雷戈索尔)。橡树显示出非常低的气候敏感性,气候变量仅解释了树轮宽度(TRW)(分别为Cambisol和Regosol站点)的24%和21%的变化。与我们的预期相反,对气候变化的增长响应(即BAI,C-13三角洲特征)与站点相关的差异并不明显。这一发现表明研究区域的橡树具有很高的可塑性。尽管在1988-1997十年间所有树木均出现明显的生长下降(归因于年平均气温增加1.1 A摄氏度),但橡树在随后的几年中已完全恢复。这表明无梗橡木对气候变化具有很高的适应力。 δC-13(corr)标记的变化主要受温度影响,δC-13(corr)值的峰值(已针对人为增加的大气CO2校正)与十年最高温度一致。 C-13增量特征和TRW(主要受降水影响)之间的相关性不显着。该发现表明木材的生长通常与碳同化脱节(例如由于树干中的碳存储或分配给种子)。由于抗旱树种的选择在适应性森林管理策略的背景下变得越来越重要,因此在气候变化的情况下,Q。petraea被证明是中欧森林中的适应性树种。

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