The Northern Inland Temperate Rainforest of British Columbia: Old Forests With a Young History?
The Northern Inland Temperate Rainforest of British Columbia: Old Forests With a Young History?
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DOI：
10.3955/046.083.0107
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发表时间：
2009-12-01
影响因子：
0.4
通讯作者：
Westover, Karlyn
中科院分区：
文献类型：
--
作者：
Gavin, Daniel G.;Hu, Feng Sheng;Westover, Karlyn
位于不列颠哥伦比亚省中东部的内陆温带雨林（ITR）以古老的雪松-铁杉森林的最好例子为标志。这种古老的森林结构成为这一景观的主要组成部分有多久了？这种森林类型的历史在生物学和保护方面有何意义？在这里，我们提出了古生态学的证据，从研究在罗布森谷的弗雷泽河上游。格里湖和红山湖的沉积物核心显示，西部铁杉和西部红杉的数量仅在过去2000年内增加。因此，ITR北方的古老森林可能只存在了几代树木。根据我们的初步证据，甚至有可能这些林分中最古老的西部红杉可能是这些遗址的第一批殖民者。进一步的古生态学研究，包括从小湖泊和森林洼地的林分年龄结构和花粉分析相结合，需要了解这些立场的历史意义。最近建立的国际热带研究报告对了解该区域现代多样生物区系的组合以及生物区系如何应对未来气候变化具有重要意义。
The inland temperate rainforest (ITR) in east-central British Columbia is marked by superlative examples of old-growth cedar-hemlock forest. How long has this old-growth forest structure been a major component of this landscape? What is the biological and conservation significance of the history of this forest type? Here we present paleoecological evidence from a study in the Robson Valley of the Upper Fraser River. Sediment cores from Gerry Lake and Redmountain Lake show that western hemlock and western redcedar increased in abundance only within the last 2000 years. Thus, the old-growth forests of the northern ITR may have been present for only a few generations of trees. It is even possible, based on our preliminary evidence, that the oldest western redcedar in these stands may be the first colonizing individuals at these sites. Further paleoecological studies, including a combination of stand-age structure and pollen analysis from small lakes and forest hollows, are needed in order to understand the historical significance of these stands. A recent establishment of the ITR has implications for understanding the assembly of the modern diverse biota of the region as well as how the biota will respond to future climate change.