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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.
Based on the pollen data of high-precision lake boreholes in central Canada, this paper introduces the research methods of vegetation units of pollen assemblage ecosystem and modern analogy to simulate ancient vegetation. After fitting the report of modern vegetation and verifying ecosystem, it is applied to sediment pollens to reconstruct the past The main results of palaeovegetments since 1000. The study showed that the best analogy of the northern forest in pollen-simulated modern vegetation was 81% in the central North America at 115 ° -95 ° W and 40 ° -60 ° N, 72% of the grassland, 94% of the grassland and savannah grassland, which are basically in line with the vegetation distribution of North American Ⅱ ecosystem.The vegetation simulation of borehole pollen deposition reflects the warm and arid climate in central North America in the past 1000 years ; Cold and humid in the early part of the Little Ice Age and cold and drought in the latter part of the 20th century, with remarkable characteristics of warming and drying in the 20th century. This study can provide Chinese scholars with pollen records to explore the changes of vegetation over the past 1000 years, especially in areas with characteristic climates , 10-100 years of time precision climate vegetation research provides a good research approach and scientific basis.