Pollen and plant macrofossils at Lac de Fully (2135 m a.s.l.): Holocene forest dynamics on a highland plateau in the Valais, Switzerland
Pollen and plant macrofossils at Lac de Fully (2135 m a.s.l.): Holocene forest dynamics on a highland plateau in the Valais, Switzerland
复制标题
DOI：
10.1177/0959683607082552
复制
发表时间：
2007-12-01
期刊：
影响因子：
2.4
通讯作者：
Tinner, Willy
中科院分区：
文献类型：
--
作者：
Finsinger, Walter;Tinner, Willy
我们使用花粉，气孔和植物宏体化石记录来推断全新世林线波动和森林组成的变化在Lac Pegeur de Fully（2 135 in a.s.l.），一个小湖，位于阿尔卑斯山中部的高原上，靠近现代森林带。我们的记录表明，在全新世早期植被是相当开放的高原（如，石楠的Dryas octopetala，Juniperus nana）。唯一能够建造主要看台的树木是贝鲁拉。其他树带界线树木（如，松cembra和落叶松）扩大后，8200卡尔BP，当冷杉alha扩大在较低的海拔湖泊的集水区。这些树带界线树木的晚期出现与该地区以前的植物宏体化石记录形成对比，这些记录表明，在I 1000 cal.BP时，树带界线已经达到海拔至少2350。我们认为，当地的气候条件可能推迟了针叶树在Lac de Fully集水区的封闭林分的扩张，直到C。8200 cal. BP，当时气候转向更潮湿和更少的大陆性条件。在c之后。4600 cal. BP湖周围的植被主要是响应人类的影响，这导致了当地降低了至少150英寸的树带界线。
We use pollen, stomata and plant-macrofossil records to infer Holocene timberline fluctuations and changes in forest composition at Lac Superieur de Fully (2 135 in a.s.l.), a small lake located near the modern regional timberline on a highland plateau in the Central Alps. Our records suggest that during the early Holocene vegetation was rather open on the plateau (eg, heaths of Dryas octopetala, Juniperus nana). The only tree that was able to build major stands was Belula. Other timberline trees (eg, Pinus cembra and Larix) expanded in the catchment of the lake after 8200 cal. BP, when Abies alha expanded at lower elevation. The late appearance of these timberline trees contrasts with previous plant-macrofossil records in the region, which show that the timberline had reached elevations up to at least 2350 in already at I 1000 cal. BP. We suggest that local climatic conditions may have delayed the expansion of closed stands of coniferous trees in the catchment of Lac de Fully until C. 8200 cal. BP, when climate shifted to more humid and less continental conditions. After c. 4600 cal. BP vegetation around the lake primarily responded to human impact, which caused a local lowering of the timberline by at least 150 in.