Growth-climate relationships for six subalpine tree species in a Mediterranean climate
Growth-climate relationships for six subalpine tree species in a Mediterranean climate
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DOI：
10.1139/cjfr-2013-0196
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发表时间：
2013-12-01
影响因子：
2.2
通讯作者：
Schwartz, Mark W.
中科院分区：
文献类型：
--
作者：
Dolanc, Christopher R.;Westfall, Robert D.;Schwartz, Mark W.
更好地了解亚高山树木的生长-气候关系是改善气候变化下未来分布预测的关键。在地中海山脉的亚高山地区，干旱是一年一次的事件，但许多地方可以有长期的积雪。分析了1896 - 2006年6个亚高山最丰富树种（红冷杉（Abies magnifica A. Murray bis），白皮松（Pinus albicaulis Engelm.），Sierra/Cascade lodgepole pine（Pinus contorta var. murrayana（Balf.）Engelm.），Jeffrey pine（Pinus jeffreyi Balf.），西部白松（Pinus monticola道格拉斯ex D. Don）和山铁杉（Tsuga mertensiana（Bong.）卡里埃）），位于美国加州的内华达州中部，一个春季积雪深厚，夏季干旱严重的地区。这六个物种的年表表现出高度的同步性，在他们的年度温度和降水量的波动的反应。对于所有六个物种，凉爽，潮湿的条件下，在一年前的增长有利于良好的径向增长，以及暖泉的春天，在增长的一年中有足够的水分。对于在受保护的斜坡上更常见的物种，如山区铁杉，深春季积雪会限制生长。虽然对该区域未来降水趋势的预测尚不确定，但干旱压力似乎已经在增加。如果这种趋势继续下去，径向生长可能会被抑制在我们的研究中的大多数或所有物种。在积雪较深的地方生长的树木可能最不容易受到生长减缓的影响。
A better understanding of the growth-climate relationship for subalpine trees is key to improving predictions about their future distributions under climate change. In subalpine regions of Mediterranean mountains, drought is an annual event, yet many sites can have long-lasting snowpack. We analyzed the growth-climate relationship from 1896 to 2006 for the six most abundant subalpine tree species (red fir (Abies magnifica A. Murray bis), whitebark pine (Pinus albicaulis Engelm.), Sierra/Cascade lodgepole pine (Pinus contorta var. murrayana (Balf.) Engelm.), Jeffrey pine (Pinus jeffreyi Balf.), western white pine (Pinus monticola Douglas ex D. Don), and mountain hemlock (Tsuga mertensiana (Bong.) Carriere)) of the central Sierra Nevada, California, USA, a region with deep spring snowpack followed by strong summer drought. Chronologies for the six species exhibited a high degree of synchrony in their response to annual fluctuations in temperature and precipitation. For all six species, cool, wet conditions in the year prior to growth are conducive to good radial growth, as well as warm springs with sufficient moisture during the year of growth. For species more common on protected slopes, such as mountain hemlock, deep spring snowpack can limit growth. Although predictions of future precipitation trends in the region are uncertain, drought stress appears to already be increasing. If this trend continues, radial growth is likely to be inhibited for most or all species in our study. Trees growing where snowpack is deep may be least likely to suffer reduced growth.