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Tree-ring investigations into changing climatic responses of yellow-cedar, Glacier Bay, Alaska

机译:对阿拉斯加冰川湾黄柏气候变化的树木年轮调查

摘要

Yellow-cedar (Callitropsis nootkatensis (D. Don) Örsted ex D.P. Little) is in a century-long decline coinciding with the end of the Little Ice Age (LIA). The leading hypothesis explaining this decline is a decrease in insulating snowpack due to warming and increased susceptibility to damaging frosts in the root zone. A ring-width series from yellow-cedar on Excursion Ridge (260 m a.s.l.) in Glacier Bay National Park and Preserve, Alaska, and another from trees on Pleasant Island (150 m a.s.l.) in the Tongass National Forest in Icy Strait were compared with regional monthly temperature and precipitation data from Sitka, Alaska, to investigate the changing growth response to temperature at these sites. Comparisons with monthly temperatures from 1832 to 1876 during the end of the Little Ice Age show that the high-elevation Excursion Ridge and the low-elevation Pleasant Island sites strongly favored warmer January through July temperatures. Both tree populations have markedly changed their response from a positive to a strong negative correlation with January through July temperatures since 1950. This strong negative response to warming by the yellow-cedar together with a positive relationship with total March and April precipitation suggests that these yellow-cedar sites may be susceptible to decline. Furthermore, these analyses are consistent with the hypothesis that the yellow-cedar decline is linked to decreased snowpack.
机译:黄柏(Callitropsis nootkatensis(D. Don)Örstedex D.P. Little)处在一个世纪的衰退中,与小冰河时代(LIA)的结束相吻合。解释这种下降的主要假设是由于变暖导致的隔热积雪减少以及对根部地区的有害霜冻的敏感性增加。比较了来自冰河湾国家公园和阿拉斯加保护区远足岭上的黄柏(260 m asl)和来自冰冷海峡汤加斯国家森林中宜人岛上树木(150 m asl)的环宽系列与来自阿拉斯加锡特卡的区域每月温度和降水数据,以调查这些地点对温度变化的增长响应。与小冰河时代末期1832年至1876年的月度温度进行比较,结果表明,高海拔游览山脊和低海拔宜人岛的站点强烈偏爱1月至7月的温度升高。自1950年以来,这两个树的种群对1月至7月温度的响应都从正向显着改变为负相关。对黄柏变暖的强烈负响应,与3月和4月的总降水量呈正相关关系,表明这些黄色雪松站点可能易于下降。此外,这些分析与黄雪松的减少与积雪减少有关的假设是一致的。

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