Quantitative study on pollen-based reconstructions of vegetation history from central Canada  

作　　者：HART Catherina VETTER Mary SAUCHYN David 

机构地区：[1]Department of Biology,University of Regina,S4S 0A2,Canada [2]Prairie Adaptation Research Collaborative,SK S4S 7J7,Canada Department of Geography,University of Regina,S4S 0A2,Canada

出　　处：《Science China Earth Sciences》2008年第8期1081-1088,共8页中国科学（地球科学英文版）

基　　金：the Major Special-Program of National Science and Technology of China (Grant No. 2008ZX02002-001);Programs of Vulnerability of Grass-land-Forest Transition to Climate Change from Environment Canada

摘　　要：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 historBased 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.

关 键 词：SEDIMENTARY POLLEN surface POLLEN modern ANALOGUE technique ecosystem PALEOVEGETATION past 1000 years 

分 类 号：Q948[生物学—植物学]