Northeastern North America as a potential refugium for boreal forests in a warming climate
Northeastern North America as a potential refugium for boreal forests in a warming climate
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DOI：
10.1126/science.aaf4951
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发表时间：
2016-06-17
期刊：
影响因子：
56.9
通讯作者：
Pederson, N.
中科院分区：
文献类型：
--
作者：
D'Orangeville, L.;Duchesne, L.;Pederson, N.
北美东北部北部的高降水量可能有助于森林承受预期的温度驱动的蒸发需求增加，但缺乏明确的证据。利用加拿大魁北克省北方针叶林 583,000 km(2) 范围内 16,450 个林分的树木年轮收集网络，我们观察到黑云杉生长与温度和降水减少的相关性发生纬度变化，从北纬 49 度以南的负值到该纬度以北的大部分为正值。我们的结果表明，气候变暖对北纬 49 度以北地区的生长速度和生长季节长度的积极影响超过了可用水量减少的潜在负面影响。与大陆北部森林的中部和西部部分不同，北美东北部在气候温暖的情况下可能充当气候避难所。
High precipitation in boreal northeastern North America could help forests withstand the expected temperature-driven increase in evaporative demand, but definitive evidence is lacking. Using a network of tree-ring collections from 16,450 stands across 583,000 km(2) of boreal forests in Quebec, Canada, we observe a latitudinal shift in the correlation of black spruce growth with temperature and reduced precipitation, from negative south of 49 degrees N to largely positive to the north of that latitude. Our results su: zest that the positive effect of a warmer climate on growth rates and growing season length north of 49 degrees N outweighs the potential negative effect of lower water availability. Unlike the central and western portions of the continent's boreal forest, northeastern North America may act as a climatic refugium in a warmer climate.