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Holocene dynamics of the southern boreal forest in Sweden

机译：瑞典南部北方森林的全新世动态

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摘要

Holocene vegetation dynamics in the ecotone between the boreo-nemoral and boreal forest were reconstructed from sediment cores of two small lakes using pollen and macrofossil analyses. Competition, migration and changing climate parameters determine species dynamics in the ecotone. The spread of Picea abies was the most important event in the vegetation history of the region, probably shaping the present distribution limits of Corylus avellana, Tilia cordata and Quercus robur through competitive exclusion. The expansion of Picea abies is well documented by abundant macrofossil finds at one of the lakes, mirroring the rise in pollen percentage and confirming the presence of the tree before Picea abies pollen frequencies reached 1%. No Picea abies macrofossils were encountered before pollen was regularly found. Changing vegetation composition through migration affects both sites at different times, while a shift in atmospheric circulation pattern may be responsible for a concordant change in vegetation composition at both sites around 5700 cal. BP.
机译：利用花粉和大型化石分析方法，从两个小湖的沉积物核心重建了北-Nemor森林与北方森林之间过渡带的全新世植被动态。竞争，迁移和不断变化的气候参数决定了过渡带的物种动态。云杉云杉的扩散是该地区植被历史上最重要的事件，可能通过竞争性排斥作用影响了欧锦葵，紫ilia和栎的当前分布极限。在一个湖泊中丰富的大型化石发现充分记录了云杉的扩展，反映了花粉百分比的上升，并在云杉的花粉频率达到1％之前确认了树的存在。在定期发现花粉之前，没有遇到过云杉。通过迁移改变植被组成会在不同时间影响两个地点，而大气环流模式的变化可能是造成5700 cal附近两个地点植被组成一致变化的原因。 BP。

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