降水梯度下中国表土花粉-植被-气候关系研究  

STUDY ON THERELATIONSHIP OF SURFACEPOLLEN,VEGETATIONAND CLIMATE ALONG A PRECIPITATION GRADIENT IN CHINA

作　　者：侯佳茗 王萌萌 马春梅[1] 袁储君 王晓勇[1] 陈澍 肖霞云[2] 郑卓 赵艳[4] HOU Jiaming;WANG Mengmeng;MA Chunmei;YUAN Chujun;WANG Xiaoyong;CHEN Shu;XIAO Xiayun;ZHENG Zhuo;ZHAO Yan(School of Geography and Ocean Science,Nanjing University,Nanjing 210023,Jiangsu;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,Jiangsu;Guangdong Provincial Key Lab of Geodynamic and Geohazards,School of Earth Sciences and Engineering,Sun Yat-sen University,Zhuhai 519082,Guangdong;Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographical Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101)

机构地区：[1]南京大学地理与海洋科学学院,江苏南京210023 [2]中国科学院南京地理与湖泊研究所,湖泊与环境国家重点实验室,江苏南京210008 [3]中山大学地球科学与工程学院,广东省地球动力作用与地质灾害重点实验室,广东珠海519082 [4]中国科学院地理科学与资源研究所,陆地表层格局与模拟院重点实验室,北京100101

出　　处：《第四纪研究》2024年第3期623-637,M0001,共16页Quaternary Sciences

基　　金：国家重点研发计划项目(批准号:2023YFF0804700和2016YFA0600501);国家自然科学基金面上项目(批准号:42271173)共同资助。

摘　　要：了解现代花粉与植被和气候的关系是重建古植被和古气候的重要基础。文章选取我国从内陆至沿海分布的148个样点,探究降水梯度下表土花粉变化特征及其与现代植被和气候的关系。结果表明:1)从内陆至沿海,孢粉组合基本能够反映出“荒漠-草原-森林”的植被变化特征。在温带荒漠和草原区域,以蒿属、藜科为主的草本花粉占优势;暖温带落叶阔叶林区域以松属、蒿属和十字花科为优势花粉,伴有落叶栎类、榛属/鹅耳枥属等落叶乔木花粉;在亚热带常绿阔叶林区域,栲属/柯属和青冈属花粉较为丰富。2)不同植被区域木本与草本花粉比值(AP/NAP)、蒿属与藜科花粉之和(A+C)、蒿属与莎草科花粉比值(A/Cy)、松属与蒿属花粉比值(P/A)等花粉指标有所不同,对区域植被和气候有较强指示意义。3)本研究中表土花粉变化与年降水量和7月均温密切相关,但在不同降水梯度下,部分花粉表现出不同的花粉-气候相关性。4)十字花科、谷物类禾本科花粉在低海拔地区含量变化与我国农田分布相对应,一定程度上可以指示人类活动。研究结果对解译地层花粉信息和提高古气候重建精度有重要意义。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.

关 键 词：表土花粉 气候因子 植被 

分 类 号：Q944.571[生物学—植物学] Q948.112