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Revegetation in the Zimei Lake Area of Mount Laojun since the Little Ice Age in Yunnan Province

PANG You-zhia,WU Jianb(a.School of Geography and Resources Science,b.College of Chemistry and Chemical Engineering, Neijiang Normal University,Neijiang,Sichuan 641100,China)  
On the basis of fossil pollen analysis in the sediments from Lake Zimei in Mount Laojun and in combination with chronological data and surface pollen in the surrounding regions,the paleovegetation in this region since LIA was reconstructed.The combined pollen data shows that the vegetation is mostly dominated by subalpine types of Abies,Ericaceae and Quercus since LIA,but the constructive and dominant species changes a lot owing to the influence of southwest monsoon.In addition,the gradually increasing percentage of Gramineae,Artemisia and Humulus pollen,also shows that human activities have played an increasingly bigger role in this basin that leads to the change of the primitive forest.
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