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首页> 外文期刊>Forest Ecology and Management >Variation of wood density and hydraulic properties of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) clones related to a heat and drought wave in France
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Variation of wood density and hydraulic properties of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) clones related to a heat and drought wave in France

机译：与热浪和干旱波有关的道格拉斯冷杉（Pseudotsuga menziesii（Mirb。）Franco）克隆木材密度和水力特性的变化

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Drought response of three Douglas-fir clones (slow, intermediate and fast growing) inhabiting two different climatic regimes in France was examined. We used the hydraulic conductivity and the percent loss of conductivity due to embolism from stems and branches as well as wood microdensity measurements to determine the role of genetics in the control of embolism in this species. Conductivity and tree-ring's microdensity variables (ring width: RW, mean ring density: MRD, minimum ring density: MID and maximum ring density: MAD) were compared in growth rings in all three clones during a typical year (2002) vs. an extremely dry year (2003). A new method was developed in order to assess axial hydraulic specific conductivity (K sub(s)) within tree rings. The results show that branches are more resistant to embolism than stems, and that there are significant differences in embolism resistance among the clones between the two sites. K sub(s) varied between years, sites and clones but the site exerted the most significant effect. Lartimache (more humid site during 2003) trees showed substantially higher K sub(s) than those inhabiting Chassenoix (strongly affected by the 2003 heat and drought wave site). Wood analysis showed a significant year effect for all ring variables and a significant clone effect for all ring variables except for MAD, while the site effect was significant for MRD and MAD. The existence of a genetic control for the study traits indicates that Douglas-fir populations introduced in France may have a selection potential to face extreme climate events like the 2003 heat and drought wave.
机译：研究了居住在法国两种不同气候条件下的三个道格拉斯冷杉克隆（慢速，中速和快速生长）的干旱反应。我们使用了水力传导率和由于茎和树枝栓塞引起的传导率损失百分比以及木材的微密度测量，来确定遗传学在控制该物种栓塞中的作用。在一个典型年份（2002年）和2003年之间，比较了所有三个克隆中年轮的电导率和年轮的微密度变量（年轮宽度：RW，平均年轮密度：MRD，最小年轮密度：MID和最大年轮密度：MAD）。极度干旱的一年（2003年）。为了评估树环内的轴向水力比电导率（K个子），开发了一种新方法。结果表明，分支比茎对栓塞的抵抗力更强，并且两个位点之间的克隆之间的栓塞抵抗力存在显着差异。 K亚群在年，位点和克隆之间变化，但是位点发挥了最显着的作用。 Lartimache（2003年期间更潮湿的地点）的树木显示的K亚基比居住在Chassenoix（受2003年高温和干旱波地点强烈影响）的树木高得多。木材分析显示，除MAD以外，所有环变量的年效应均显着，所有环变量的克隆效应均显着，而MRD和MAD的位点效应均显着。对研究性状的遗传控制的存在表明，法国引入的道格拉斯冷杉种群可能具有面对诸如2003年高温和干旱波等极端气候事件的选择潜力。

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