Landscape openness and pollen records: a simulation approach
Landscape openness and pollen records: a simulation approach
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DOI：
10.1191/095968399666429937
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发表时间：
1999-05
期刊：
影响因子：
--
通讯作者：
S. Sugita;M. Gaillard;A. Broström
中科院分区：
文献类型：
--
作者：
S. Sugita;M. Gaillard;A. Broström
对过去森林砍伐面积的定量重建对于评估对欧洲过去环境（包括过去气候）可能产生的间接人为影响至关重要。我们应用花粉散布和沉积的模拟模型(1)重新审视花粉与景观开放度之间的关系，通常仅从非树栖花粉（NAP）百分比中不加批判地推断；(2)预测相关的花粉源区域，即从花粉记录中可以重建的最小植被空间尺度。模拟使用了瑞典南部现代开放农业和半开放森林地区的景观，这些地区仍然保留着传统的文化景观。该模型是合理的，因为模拟的花粉组合与两种景观类型中观测到的花粉组合相似，并且模拟的NAP百分比与1000 m范围内开放土地盖度百分比之间的关系与经验关系一致。模拟的相关花粉源区域为距离小洼地和3-ha池塘800-1000 m范围内的区域。NAP百分比只能粗略地初步估计开放土地覆盖的百分比。将需要更全面的方法来从化石花粉中获得开阔土地的定量估计。
Quantitative reconstruction of the area cleared of forest in the past is essential to assess the possible indirect anthropogenic impacts on the past environment of Europe, including past climate. We apply a simul ation model of pollen dispersal and deposition (1) to re-examine the relationship between pollen and landscape openness, often uncritically inferred from non-arboreal pollen (NAP) percentages alone, and (2) to predict the relevant source area of pollen, the smallest spatial scale of vegetation that can be reconstructed from pollen records. The simulations use landscapes simplified from the modern open agricultural and semi-open forested regions in southern Sweden where traditional cultural landscapes still remain. The model is appropriate, because the simulated pollen assemblages resemble the pollen assemblages observed in each of the two landscape types, and because the simulated relationships between NAP percentages and percentage cover of open land within 1000 m agree with the empirical relationships. The simulated relevant source area of pollen is the area within 800–1000 m from both small hollows and 3-ha ponds. NAP percentages give only a rough first approximation of the percentage cover of open land. More comprehensive methods will be required to obtain quantitative estimates of open land from fossil pollen.