Vincent P. Riedel, Patrick Engel, Pierre-André Waite, Roman M. Link, Randolf Schirmer, Joachim Hamberger, Bernhard Schuldt
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引用次数: 0
Key message
In Douglas-fir grown in Central Europe, growth and specific leaf area differed between coastal and interior provenances but little intra-specific variability was found for the Huber value and xylem safety.
Abstract
In Central Europe, the economically most important timber species for roundwood production, Norway spruce, has been severely affected by recent global change-type drought events. Due to its large spatial distribution, Douglas-fir (Pseudotsuga menziesii) is considered for conversion to climate-resilient forests. Specifically, provenances from moister coastal and drier and colder interior regions might differ in drought tolerance traits. Here, we characterized aboveground biomass increment as well as leaf morphological and plant hydraulic traits in mature trees of 28 Douglas-fir provenances from three climate-at-origin groups across a climatic gradient in Central Europe, covering a precipitation range of 542 mm yr−1. Irrespective of the gradient, the northern interior provenances had a 5.4 kg yr−1 lower aboveground biomass increment than the two coastal groups, accompanied by a 13% smaller specific leaf area. On the other hand, the Huber value, embolism resistance (P50) and leaf carbon isotope signature (δ13C) as proxy for long-term intrinsic water use efficiency did not differ between climate-origin groups. Across the gradient and within a climate-origin-group, no effect of climatic aridity on any of the traits covered was observed. Especially P50 showed very little intra-specific variability, and our observed mean of −3.5 MPa is in the same range as P50-values for Douglas-fir recently reported from Europe. Our results for Douglas-fir support that xylem safety is a rather conservative and evolutionary canalized trait in conifers, while the Huber value revealed less plasticity as expected. Future studies are needed to test whether slower-growing interior provenances with thicker and smaller needles might be more drought tolerant and thus better suited for cultivation in the future climate of Central Europe although xylem safety does not differ.
生长在中欧的道格拉斯冷杉，生长和比叶面积在沿海和内陆种源之间存在差异，但在Huber值和木质部安全性方面几乎没有种内差异。摘要在中欧，作为经济上最重要的圆材生产树种，挪威云杉受到近年来全球变化型干旱事件的严重影响。由于其广阔的空间分布，道格拉斯冷杉（pseudosuga menziesii）被认为可以转化为气候适应型森林。具体来说，来自潮湿的沿海地区和干燥寒冷的内陆地区的种源可能在耐旱性状上有所不同。在此，我们研究了中欧地区3个气候源类群的28个道格拉斯冷杉种源的成熟树木的地上生物量增量、叶片形态和植物水力性状，覆盖了542 mm yr - 1的降水范围。无论坡度如何，北部内陆种源的地上生物量增量比两个沿海种源低5.4 kg yr - 1，比叶面积小13%。另一方面，代表长期内在水分利用效率的Huber值、栓塞抗性（P50）和叶片碳同位素特征（δ13C）在不同气候源组之间没有差异。在整个梯度和气候起源群内，没有观察到气候干旱对所覆盖的任何特征的影响。特别是P50表现出非常小的种内变动性，我们观测到的- 3.5 MPa的平均值与最近从欧洲报道的道格拉斯冷杉的P50值处于相同的范围。我们对道格拉斯杉木的研究结果支持了针叶树木质部安全是一个相当保守的进化通道特性，而Huber值显示的可塑性不如预期。尽管木质部的安全性没有差异，但需要进一步的研究来检验生长较慢、针叶较粗、针叶较小的内部种源是否更耐旱，从而更适合中欧未来气候下的种植。
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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