Identifying the tundra – forest border in the stomate record: an analysis of lake surface samples from the Yellowknife area, Northwest Territories, Canada
Identifying the tundra – forest border in the stomate record: an analysis of lake surface samples from the Yellowknife area, Northwest Territories, Canada
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DOI：
10.1139/b96-099
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发表时间：
1996-05
期刊：
影响因子：
1.1
通讯作者：
B. S. Hansen;G. MacDonald;K. Moser
中科院分区：
文献类型：
--
作者：
B. S. Hansen;G. MacDonald;K. Moser
在西北地区耶洛奈夫附近树线地带的湖泊表面样本中发现了针叶树气孔，以评估利用化石气孔重建北极树线过去变化的潜在用途。区分了落叶松、松属、海南云杉和白云杉的气孔。冻土带湖泊中没有针叶树气孔，而森林冻土带和森林湖泊中普遍存在针叶树气孔。气孔分析记录了该地区落叶松的存在；相比之下，这种相对常见的树的花粉在同一地点的花粉表面样本中很少见。然而，针叶树气孔分析不能解决森林-冻土带和封闭林之间的差异。气孔在提高树木线过去位置的分辨率方面的潜力，再加上湖泊中气孔的存在将缺乏良好的宏观化石记录，这表明气孔分析将成为补充花粉分析的重要技术。
Conifer stomata were identified in surface samples from lakes in the treeline zone near Yellowknife, Northwest Territories, to assess the potential use of fossil stomata for reconstructing past changes in the arctic tree line. Stomata of Larix, Pinus, Picea mariana, and Picea glauca were distinguished. Conifer stomata were absent in samples from tundra lakes, whereas they were generally present in forest–tundra and forest lakes. Stomate analysis recorded the presence of Larix trees in the area; in contrast, the pollen of this relatively common tree was infrequent in pollen surface samples from the same sites. Conifer stomate analysis, however, is not able to resolve differences between forest–tundra and closed forest. The potential of stomata for providing improved resolution of past locations of the tree line, coupled with the presence of stomata in lakes that would lack good macrofossil records, suggest that stomate analysis will become an important technique supplementing pollen analysis for reconstruc...