Drought response of five conifer species under contrasting water availability suggests high vulnerability of Norway spruce and European larch
Drought response of five conifer species under contrasting water availability suggests high vulnerability of Norway spruce and European larch
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DOI：
10.1111/gcb.12268
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发表时间：
2013-10-01
影响因子：
11.6
通讯作者：
Rigling, Andreas
中科院分区：
文献类型：
--
作者：
Levesque, Mathieu;Saurer, Matthias;Rigling, Andreas
人们对树种科普预期的供水量减少的能力仍然知之甚少。我们评估了挪威云杉，苏格兰松，欧洲落叶松，黑松，花旗松，以抵御干旱的未来气候干旱的潜力，通过分析他们过去的生长和生理反应在一个干旱和中温带网站在中欧树木生态学方法。早材，晚材，总轮宽度，以及C-13和O-18在早期和晚材进行了测量和统计相关的多标量土壤水分亏缺指数从1961年至2009年。在干旱地区，所有物种的C-13值与持续时间超过11个月的水分亏缺密切相关，表明对碳库的长期累积效应。树木在干旱的网站是特别敏感的土壤水分补给在前秋季和早春。本地物种欧洲落叶松和挪威云杉，生长接近其干燥的分布限制在干旱的网站，被认为是最脆弱的物种土壤水分亏缺。在梅西奇网站，夏季水的供应是至关重要的所有物种，而水的供应之前，生长季节是不太重要的。树木在mesic更容易受到水分亏缺的持续时间较短，比干旱的网站。我们的结论是，如果夏季变得干燥，树木生长在梅西奇网站将经历显着的增长减少，而在其干燥的分布限制在阿尔卑斯山，树木生长的高度敏感的云杉和落叶松可能会崩溃，可能会诱发枯死，并损害生态系统服务的提供。然而，这些变化的幅度将强烈介导的土壤水补给在冬季，从而在生长季节开始时的水供应。
The ability of tree species to cope with anticipated decrease in water availability is still poorly understood. We evaluated the potential of Norway spruce, Scots pine, European larch, black pine, and Douglas-fir to withstand drought in a drier future climate by analyzing their past growth and physiological responses at a xeric and a mesic site in Central Europe using dendroecological methods. Earlywood, latewood, and total ring width, as well as the C-13 and O-18 in early- and latewood were measured and statistically related to a multiscalar soil water deficit index from 1961 to 2009. At the xeric site, C-13 values of all species were strongly linked to water deficits that lasted longer than 11months, indicating a long-term cumulative effect on the carbon pool. Trees at the xeric site were particularly sensitive to soil water recharge in the preceding autumn and early spring. The native species European larch and Norway spruce, growing close to their dry distribution limit at the xeric site, were found to be the most vulnerable species to soil water deficits. At the mesic site, summer water availability was critical for all species, whereas water availability prior to the growing season was less important. Trees at the mesic were more vulnerable to water deficits of shorter duration than the xeric site. We conclude that if summers become drier, trees growing on mesic sites will undergo significant growth reductions, whereas at their dry distribution limit in the Alps, tree growth of the highly sensitive spruce and larch may collapse, likely inducing dieback and compromising the provision of ecosystem services. However, the magnitude of these changes will be mediated strongly by soil water recharge in winter and thus water availability at the beginning of the growing season.