STUDY ON THE RELATIONSHIP OF SURFACE POLLEN,VEGETATION AND CLIMATE ALONG A PRECIPITATION GRADIENT IN CHINA
Understanding the intricate relationships among surface pollen,vegetation and climate forms a crucial basis for reconstructing paleoclimate and paleovegetation.In this article,we meticulously selected 148 sample sites spanning from inland to coastal(24.7°～42.2° N,101.4°～121.5°E),embarking on a comprehensive examination of the surface pollen-vegetation-climate interplay along a precipitation gradient.The results show that:(1)From inland to coastal,pollen assemblages can reflect the vegetation change shifts from deserts to steppes and subsequently to forests.In the temperate desert and steppe regions,herb pollen such as Artemisia and Chenopodiaceae are dominant.Pinus,Artemisia and Brassicaceae are the representative pollen of the warm temperate deciduous broadleaf forest region,which has some deciduous tree pollen taxa such as Quercus D and Corylus/Carpinus.In subtropical evergreen broadleaf forest region,Castanopsis/Lithocarpus and Cyclobalanopsis pollen is relatively abundant.(2)Pollen indices including arboreal pollen/non-arboreal pollen(AP/NAP),Pinus/Artemisia(P/A),Artemisia+Chenopodiaceae(A+C)and Artemisia/Cyperaceae(A/Cy)are different among different vegetation regions.These indices effectively signify changes in vegetation and regional climate.(3)Annual precipitation and July mean temperature are closely related to the variation of surface pollen assemblage.Nevertheless,in different regions along precipitation gradient,some pollen taxas exhibit different pollen-climate relationships.(4)The pollen content of Brassicaceae and Poaceae Cereal is relatively high in low altitude areas,aligning with the distribution of farmland in China and indicating human activity to some extent.The results hold significant implications for interpreting stratigraphic pollen information and improving the accuracy of paleoclimate reconstruction.
万方数据
维普
