Altitudinal changes of surface pollen and vegetation on the north slope of the Middle Tianshan Mountains,China  

作　　者：YANG Zhenjing ZHANG Yun REN Haibao YAN Shun KONG Zhaochen MA Keping NI Jian 

机构地区：[1]Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences [2]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences [3]Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences [4]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences

出　　处：《Journal of Arid Land》2016年第5期799-810,共12页干旱区科学（英文版）

基　　金：jointly funded by the National Natural Science Foundation of China (40972212,41272386,41572331,90102009,31590822);the Scientific Research Foundation for the Young Scientists of State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences and the Returned Overseas Chinese Scholars,Ministry of Education of the People’s Republic of China and the National Postdoc Science Foundation of China (2003033253)

摘　　要：To provide information on vegetation patterns and altitudinal distributions of pollen assemblage in surface soil layers,their complicated relationships in a dryland mountain-basin system in northwestern China and a realistic basis for paleovegetational reconstruction,we investigated 86 vegetation quadrats and analyzed 80 soil samples from the surface soil layers along an altitudinal transect on the north slope of the Middle Tianshan Mountains from alpine cushion vegetation at 3,510 m near glacier to desert vegetation at 460 m in the Gurbantunggut Desert.According to surface pollen assemblages and the results of the detrended correspondence analysis,the transect can be divided into six major altitudinal pollen zones as alpine cushion vegetation,alpine and subalpine meadows,montane Picea forest,forest-steppe ecotone,Artemisia desert and typical desert,which basically reflect the characteristics of the mountainous vegetation patterns on the north slope of the Middle Tianshan Mountains.However,Picea pollen also exists outside the spruce forest,Chenopodiaceae and Artemisia pollen appeared above the elevation of 1,300 m,indicating that most of them might be introduced from lower elevations by upslope winds.Airborne pollen researches from three regions at different elevations further suggest that a high-frequency northwest anabatic wind has a remarkable influence on the transportation and dispersion of surface pollen in the area.To provide information on vegetation patterns and altitudinal distributions of pollen assemblage in surface soil layers,their complicated relationships in a dryland mountain-basin system in northwestern China and a realistic basis for paleovegetational reconstruction,we investigated 86 vegetation quadrats and analyzed 80 soil samples from the surface soil layers along an altitudinal transect on the north slope of the Middle Tianshan Mountains from alpine cushion vegetation at 3,510 m near glacier to desert vegetation at 460 m in the Gurbantunggut Desert.According to surface pollen assemblages and the results of the detrended correspondence analysis,the transect can be divided into six major altitudinal pollen zones as alpine cushion vegetation,alpine and subalpine meadows,montane Picea forest,forest-steppe ecotone,Artemisia desert and typical desert,which basically reflect the characteristics of the mountainous vegetation patterns on the north slope of the Middle Tianshan Mountains.However,Picea pollen also exists outside the spruce forest,Chenopodiaceae and Artemisia pollen appeared above the elevation of 1,300 m,indicating that most of them might be introduced from lower elevations by upslope winds.Airborne pollen researches from three regions at different elevations further suggest that a high-frequency northwest anabatic wind has a remarkable influence on the transportation and dispersion of surface pollen in the area.

关 键 词：altitudinal transect vegetation zone pollen assemblage Picea forest the Middle Tianshan Mountains 

分 类 号：Q948[生物学—植物学]