Long-term changes in floristic diversity in southern Sweden:: palynological richness, vegetation dynamics and land-use
Long-term changes in floristic diversity in southern Sweden:: palynological richness, vegetation dynamics and land-use
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DOI：
10.1007/s00334-007-0094-x
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发表时间：
2008-09-01
影响因子：
2.5
通讯作者：
Persson, Thomas
中科院分区：
文献类型：
--
作者：
Berglund, Bjorn E.;Gaillard, Marie-Jose;Persson, Thomas
稀疏技术适用于两个全新世花粉序列（涵盖过去12,000日历年）从瑞典南部的两个湖泊。一个代表一个开放的农业景观，另一个部分树木繁茂，耕地较少。推断的孢粉丰富度被解释为在景观尺度上的植物多样性的近似措施。总体趋势是从全新世中期到现代时期的多样性增加，这与人类影响的平行增加有关。这两个遗址的模式相似，峰值对应于以森林砍伐和扩大定居点和农业为特征的考古时期。最高的多样性是在中世纪时期，大约公元1000 - 1400年。在过去200年里，农业景观的特点是多样性下降。这些结果证实，斯堪的纳维亚半岛南部，在景观尺度和千年到世纪的时间尺度上的生物多样性的“中间干扰”假说。它们对以维持和促进生物多样性为目的的现代自然保护中的景观管理具有影响。
The rarefaction technique is applied to two Holocene pollen sequences (covering the last 12,000 calendar years) from two lakes in southern Sweden. One represents an open agricultural landscape, the other a partly wooded and less cultivated landscape. The inferred palynological richness is interpreted as an approximate measure of floristic diversity at the landscape scale. The overall trend is an increased diversity from the mid-Holocene to the Modern period, which is linked to a parallel rise in human impact. The pattern is similar for the two sites with peaks corresponding to archaeological periods characterised by deforestation and expanding settlement and agriculture. The highest diversity was reached during the Medieval period, about A.D. 1,000-1,400. Declining diversity during the last 200 years characterises the agrarian landscape. These results confirm, for southern Scandinavia, the "intermediate disturbance" hypothesis for biodiversity at the landscape scale and on millennial to century time scales. They have implications for landscape management in modern nature conservation that has the purpose of maintaining and promoting biodiversity.