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您的检索式：作者名="SAUCHYN David"
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| 1 | Quantitative study on pollen-based reconstructions of vegetation history from central Canada显示文摘Based on high-resolution pollen records from lake cores in central Canada, the present study instructed pollen taxa assignations in ecosystem groups and modern analogue technique, reported major results of quantitative reconstructions of vegetation history during the last 1000 years, and discussed the validation of simulated vegetation. The results showed that in central America (115°-95°W, 40°-60°N), best analogue of the modern vegetation is 81% for boreal forest, 72% for parkland, and 94% for grassland-parkland, which are consistent with vegetation distributions of the North American Ecosystem II. Simulations of the past vegetation from the sedimentary pollen showed climate changes during the past 1000 years: it was warm and dry in the Medieval Warm period, cold and wet in the earlier period and cold and dry in the later period of the Little Ice Age. It became obviously increasing warm and drought in the 20th century. The present studies would provide us scientific basis to understand vegetation and climate changes during the last 1000 years in a characteristic region and in 10-100 year time scales. | HART Catherina VETTER Mary SAUCHYN David | 2008 | Science China Earth Sciences2008，51，8： | 2 |
| 2 | 根据加拿大中部花粉记录定量重建植被演变历史的研究显示文摘根据加拿大中部高精度湖泊钻孔的花粉数据,介绍花粉型组合生态系植被单元和现代类比法模拟古植被的研究方法,报告拟合现代植被和验证生态系区后应用在沉积花粉中、重建过去1000年以来古植被的主要结果.该研究表明,在115°~95°W和40°~60°N的北美中部,花粉模拟的现代植被中的北方林型最佳类比率81%,稀树草地型72%,草原和稀树草地型94%,与北美Ⅱ生态系植被分布基本吻合.钻孔沉积花粉的植被模拟反映了过去1000年北美中部经历了中世纪暖期,具有温暖而干旱的气候;小冰期前期寒冷而湿润,后期寒冷而干旱;20世纪具有显著的增温和转干特征.该项研究可为中国学者采用花粉记录探索过去1000年以来植被变化,尤其是在具有特征气候区域、10~100年时间精度的气候植被研究提供良好的研究途径和科学依据. | 于革 Hart Catherine Mary Vetter David Sauchyn | 2008 | 中国科学(D辑)2008，38，11： | 1 |
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