The pace of Holocene vegetation change : testing for synchronous developments

The pace of Holocene vegetation change : testing for synchronous developments
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全新世植被变化的步伐:同步发展的测试

DOI:
10.1016/j.quascirev.2011.06.014
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发表时间:
2011
影响因子:
4
通讯作者:
S Wolters
S Wolters
中科院分区:
地球科学1区
文献类型:
--
作者:
Giesecke;Bennett;Bozilova;Feurdean;Finsinger;Pokorny;Rösch;Seppä;Tonkov;Valsecchi;S Wolters

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中高纬度森林生态系统在全新世期间经历了几次重大的组成变化。这些植被变化的时间和空间模式蕴藏着有关其原因和触发因素的潜在信息。在这里,我们检验了植被变化时间在次大陆尺度上同步的假设,这意味着气候参数的共同触发因素或阶梯式变化。来自选定欧洲地区的花粉图在统计上分为组合区,并分析了区域边界的时间模式。结果表明,植被变化的时间格局与随机变化显着不同。变化时间集中在 8.2、4.8、3.7 和 1.2 ka 左右,而高于平均稳定性的时间则出现在 2.1 和 5.1 ka 左右。与榛树和桤木扩张相关的成分变化分别集中在 10.6 和 9.5 ka 左右。引发这些变化的气候触发因素可能分别提前 0.5 至 1 ka 发生。 C. avellana 和 A. glutinosa 的同步扩张说明了扩散不一定伴随着种群扩张。 A. glutinosa 在邻近的欧洲地区部分同步、部分随机的扩张表明,种群数量的突然同步扩张并非物种特有的特征,而是因地区而异。
Mid to high latitude forest ecosystems have undergone several major compositional changes during the Holocene. The temporal and spatial patterns of these vegetation changes hold potential information to their causes and triggers. Here we test the hypothesis that the timing of vegetation change was synchronous on a sub-continental scale, which implies a common trigger or a step-like change in climate parameters. Pollen diagrams from selected European regions were statistically divided into assemblage zones and the temporal pattern of the zone boundaries analysed. The results show that the temporal pattern of vegetation change was significantly different from random. Times of change cluster around 8.2, 4.8, 3.7, and 1.2 ka, while times of higher than average stability were found around 2.1 and 5.1 ka. Compositional changes linked to the expansion of Corylus avellana and Alnus glutinosa centre around 10.6 and 9.5 ka, respectively. A climatic trigger initiating these changes may have occurred 0.5 to 1 ka earlier, respectively. The synchronous expansion of C. avellana and A. glutinosa exemplify that dispersal is not necessarily followed by population expansion. The partly synchronous, partly random expansion of A. glutinosa in adjacent European regions exemplifies that sudden synchronous population expansions are not species specific traits but vary regionally.
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DOI: --
发表时间: 1998
期刊: Proceedings of the Estonian Academy of Sciences. Geology
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