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Plasticity in hydraulic architecture of Scots pine across Eurasia

机译：整个欧亚大陆的苏格兰松的水力建筑中的可塑性

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摘要

Widespread tree species must show physiological and structural plasticity to deal with contrasting water balance conditions. To investigate these plasticity mechanisms, a meta-analysis of Pinus sylvestris L. sap flow and its response to environmental variables was conducted using datasets from across its whole geographical range. For each site, a Jarvis-type, multiplicative model was used to fit the relationship between sap flow and photosynthetically active radiation, vapour pressure deficit (D) and soil moisture deficit (SMD); and a logarithmic function was used to characterize the response of stomatal conductance (G s) to D. The fitted parameters of those models were regressed against climatic variables to study the acclimation of Scots pine to dry/warm conditions. The absolute value of sap flow and its sensitivity to D and SMD increased with the average summer evaporative demand. However, relative sensitivity of G s to D (m/G s,ref, where m is the slope and G s,ref is reference G s at D = 1 kPa) did not increase with evaporative demand across populations, and transpiration per unit leaf area at a given D increased accordingly in drier/warmer climates. This physiological plasticity was linked to the previously reported climate- and size-related structural acclimation of leaf to sapwood area ratios. G s,ref, and its absolute sensitivity to D (m), tended to decrease with age/height of the trees as previously reported for other pine species. It is unclear why Scots pines have higher transpiration rates at drier/warmer sites, at the expense of lower water-use efficiency. In any case, our results suggest that these structural adjustments may not be enough to prevent lower xylem tensions at the driest sites.
机译：广泛的树种必须具有生理和结构可塑性，才能应对水平衡条件的差异。为了研究这些可塑性机制，使用了来自整个松树地理范围的数据集，对樟子松树液流动及其对环境变量的响应进行了荟萃分析。对于每个部位，均采用Jarvis型乘法模型来拟合树液流量与光合有效辐射，蒸气压亏缺（D）和土壤水分亏缺（SMD）之间的关系。并用对数函数表征气孔导度（G s ）对D的响应。将这些模型的拟合参数与气候变量进行回归，以研究苏格兰松树在干燥/温暖条件下的适应性。汁液流量的绝对值及其对D和SMD的敏感性随夏季平均蒸发需求的增加而增加。但是，G s 对D的相对灵敏度（m / G s，ref ，其中m是斜率，G s，ref 是D =时的参考G s 。 1 kPa）并没有随着种群间蒸发需求的增加而增加，在干燥/较暖的气候下，给定D下单位叶面积的蒸腾量也相应增加。这种生理可塑性与先前报道的与叶边材面积比的气候和大小相关的结构适应有关。 G s，ref 及其对D（m）的绝对敏感度，会随着树木的年龄/高度的增加而降低，如先前其他松树物种报道的那样。尚不清楚为什么苏格兰松树在较干燥/较暖的地方具有较高的蒸腾速率，却以较低的用水效率为代价。无论如何，我们的结果表明，这些结构调整可能不足以防止在最干燥的部位降低木质部张力。

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  • 来源
    《Oecologia》 |2007年第2期|245-259|共15页
  • 作者

    R. Poyatos; J. Martínez-Vilalta; J. Čermák; R. Ceulemans; A. Granier; J. Irvine; B. Köstner; F. Lagergren; L. Meiresonne; N. Nadezhdina; R. Zimmermann; P. Llorens; M. Mencuccini;

  • 作者单位

    Institute of Earth Sciences Jaume Almera ICTJA-CSIC Lluís Solé i Sabarís s 08028 Barcelona Spain;

    School of GeoSciences University of Edinburgh Crew Building King’s Buildings Edinburgh EH9 3JN UK;

    Institute of Forest Ecology Mendel University of Agriculture and Forestry Zĕmĕdĕlská 3 613000 Brno Czech Republic;

    Department of Biology University of Antwerpen Universiteitsplein 1 2610 Wilrijk Belgium;

    Ecologie et Ecophysiologie Forestières INRA-Centre de Nancy 54280 Champenoux France;

    Department of Forest Science Richardson Hall College of Forestry Oregon State University Corvallis OR 97331-5752 USA;

    Department of Meteorology Institute for Hydrology and Meteorology Technische Universität Dresden 01062 Dresden Germany;

    Physical Geography and Ecosystems Analysis Geobiosphere Science Centre Lund University Sölvegatan 12 223 62 Lund Sweden;

    Research Institute for Nature and Forest Gaverstraat 4 9500 Geraardsbergen Belgium;

    Institute of Forest Ecology Mendel University of Agriculture and Forestry Zĕmĕdĕlská 3 613000 Brno Czech Republic;

    Max Planck Institute for Biogeochemistry PO Box 100164 07743 Jena Germany;

    Institute of Earth Sciences Jaume Almera ICTJA-CSIC Lluís Solé i Sabarís s 08028 Barcelona Spain;

    School of GeoSciences University of Edinburgh Crew Building King’s Buildings Edinburgh EH9 3JN UK;

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  • 正文语种 eng
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  • 关键词

    Hydraulic plasticity; Leaf area:sapwood area; Pinus sylvestris; Sap flow; Stomatal conductance;

    机译：水力可塑性;叶面积：边材面积;樟子松;树液流量;气孔导度;

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