Global patterns of vegetation response to millennial-scale variability and rapid climate change during the last glacial period
Global patterns of vegetation response to millennial-scale variability and rapid climate change during the last glacial period
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DOI：
10.1016/j.quascirev.2010.07.016
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发表时间：
2010-10-01
影响因子：
4
通讯作者：
Goni, M. F. Sanchez
中科院分区：
文献类型：
--
作者：
Harrison, S. P.;Goni, M. F. Sanchez
全世界有 94 个地点具有足够的分辨率和年代记录，可以记录上一个冰期期间千年尺度的气候变化对植被和火灾状况的影响。尽管 Dansgaard-Oeschger(D-O) 循环都表现出基本相似的总体结构，但它们在暖期和冷期的幅度和长度上有所不同。我们通过比较 D-O 6、D-O 8 和 D-O 19 来说明气候引起的植被变化的地理模式。D-O 变暖事件和随后的降温都有强烈的反应，在北部温带地区最为明显。来自北温带海洋核心的花粉记录证实，在测年分辨率的范围内（50-100年），气候变化和植被反应之间不存在滞后。然而，植被变化的幅度是因地区而异的，并不是格陵兰冰芯记录的气候变化幅度或持续时间的简单函数。火情也表现出对气候变化的最初立即反应，但在冷却间隔期间，生物量燃烧在最初减少后缓慢恢复，这表明通过恢复植被生产力进行二次控制。在温带地区，植被变化很大程度上取决于冬季温度，而在热带地区，植被变化主要取决于植物可用水的变化。热带植被记录显示与 Heinrich Stadials 相对应的变化，但对 D-O 变暖事件的响应不如北部温带地区那么明显。南半球温带地区的高分辨率记录很少，但这些记录也显示了植被和火灾对千年尺度气候变化的响应。目前尚不可能明确确定陆地记录是否反映了冰芯记录中明显的异步性。 (C) 2010 Elsevier Ltd. 保留所有权利。
Ninety-four sites worldwide have sufficient resolution and dating to document the impact of millennial-scale climate variability on vegetation and fire regimes during the last glacial period. Although Dansgaard-Oeschger(D-O) cycles all show a basically similar gross structure, they vary in the magnitude and the length of the warm and cool intervals. We illustrate the geographic patterns in the climate-induced changes in vegetation by comparing D-O 6, D-O 8 and D-O 19. There is a strong response to both D-O warming events and subsequent cooling, most marked in the northern extratropics. Pollen records from marine cores from the northern extratropics confirm that there is no lag between the change in climate and the vegetation response, within the limits of the dating resolution (50-100 years). However, the magnitude of the change in vegetation is regionally specific and is not a simple function of either the magnitude or the duration of the change in climate as registered in Greenland ice cores. Fire regimes also show an initial immediate response to climate changes, but during cooling intervals there is a slow recovery of biomass burning after the initial reduction, suggesting a secondary control through the recovery of vegetation productivity. In the extratropics, vegetation changes are largely determined by winter temperatures while in the tropics they are largely determined by changes in plant-available water. Tropical vegetation records show changes corresponding to Heinrich Stadials but the response to D-O warming events is less marked than in the northern extratropics. There are very few high-resolution records from the Southern Hemisphere extratropics, but these records also show both a vegetation and fire response to millennial-scale climate variability. It is not yet possible to determine unequivocally whether terrestrial records reflect the asynchroneity apparent in the ice-core records. (C) 2010 Elsevier Ltd. All rights reserved.