The 2007 eastern US spring freezes: Increased cold damage in a warming world?
The 2007 eastern US spring freezes: Increased cold damage in a warming world?
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DOI：
10.1641/b580311
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发表时间：
2008-03-01
期刊：
影响因子：
10.1
通讯作者：
Meyers, Tilden
中科院分区：
文献类型：
--
作者：
Gu, Lianhong;Hanson, Paul J.;Meyers, Tilden
长期以来，植物生态学家一直关注植物生长与气候变化之间看似矛盾的关系：变暖实际上可能会增加植物霜冻损害的风险。基本假设是，随着气候变暖，预计暖冬和温暖的早春可能会导致植物过早发育，导致脆弱的植物组织和器官暴露在随后的晚季霜冻之下。2007年春季美国东部的冰冻为评估这一假设和评估其大规模后果提供了一个极好的机会。在这篇文章中，我们对比了异常温暖的条件下所造成的快速冻结前物候的进步与戏剧性的冻结后挫折，并报告了复杂的模式，冻害植物。这一事件对农作物和自然植被的广泛破坏表明，有必要将春季气温的大幅波动视为对气候变暖中陆地生态系统结构和功能的真实的威胁。
Plant ecologists have long been concerned with a seemingly paradoxical scenario in the relationship between plant growth and climate change: warming may actually increase the risk of plant frost damage. The underlying hypothesis is that mild winters and warm, early springs, which are expected to occur as the climate warms, may induce premature plant development, resulting in exposure of vulnerable plant tissues and organs to subsequent late-season frosts. The 2007 spring freeze in the eastern United States provides an excellent opportunity to evaluate this hypothesis and assess its large-scale consequences. In this article, we contrast the rapid prefreeze phenological advancement caused by unusually warm conditions with the dramatic postfreeze setback, and report complicated patterns of freeze damage to plants. The widespread devastation of crops and natural vegetation occasioned by this event demonstrates the need to consider large fluctuations in spring temperatures a real threat to terrestrial ecosystem structure and functioning in a warming climate.