中国亚热带表土孢粉分布规律及其与气候的关系研究  

SURFACE POLLEN DISTRIBUTION AND ITS RELATIONSHIP WITH CLIMATE IN SUBTROPICAL CHINA

作　　者：何玲玲 黄康有 陈聪 汤永杰 张潇 郑卓 吕厚远[3] 马春梅[4] 肖霞云[5] 张芸[6] 赵艳[7] HE Lingling;HUANG Kangyou;CHEN Cong;TANG Yongjie;ZHANG Xiao;ZHENG Zhuo;LÜHouyuan;MA Chunmei;XIAO Xiayun;ZHANG Yun;ZHAO Yan(Guangdong Provincial Key Lab of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-sen University,Zhuhai 519082,Guangdong;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,Guangdong;Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;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;State Key Laboratory of Black Soils Conservation and Utilization,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,Jilin;Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101)

机构地区：[1]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 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [3]中国科学院地质与地球物理研究所,中国科学院新生代地质与环境重点实验室,北京100029 [4]南京大学地理与海洋科学学院,江苏南京210023 [5]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 [6]中国科学院东北地理与农业生态研究所,黑土地保护与利用全国重点实验室,吉林长春130102 [7]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638-655,共18页Quaternary Sciences

基　　金：国家重点研发计划项目(批准号:2022YFF0801501);国家自然科学基金项目(批准号:42077414和42072205)共同资助。

摘　　要：孢粉分析是古气候定量重建最可靠的方法之一,现代孢粉分布规律及其与气候因子之间关系的建立对于利用化石孢粉资料开展古气候定量重建至关重要。本研究以中国亚热带地区1140个表土孢粉样品为研究对象,通过冗余分析(Redundancy Analysis)等方法,探讨中国亚热带地区表土孢粉分布规律及其与气候的关系。研究结果表明:1)亚热带地区表土孢粉种类丰富,以松属(Pinus)、栲属(Castanopsis)、青冈属(Cyclobalanopsis)、桤木属(Alnus)、落叶栎类(Quercus)等孢粉种类最为常见,区域内5个植被带呈现出不同的孢粉组合;2)孢粉的空间分布具有显著的经度、纬度、海拔递变性,特定含量的孢粉具有地理指示意义;3)冬季平均降水量(MWP)是影响亚热带表土孢粉分布的关键气候因子,在选择气候定量重建参数时应优先考虑,此外,1月平均温度(Mtco)、冬季平均相对湿度(MWH)、7月平均温度(Mtwa)和7月平均相对湿度(Mhwa)对亚热带表土孢粉分布也具有重要影响,与MWP共同解释了亚热带大部分的表土孢粉组成变化;4)影响北亚热带、东部中亚热带、东部南亚热带、西部中亚热带、西部南亚热带表土孢粉分布的主要气候因子分别为年平均温度(MAT)、夏季平均相对湿度(MSH)、冬季平均降水量(MWP)、1月平均温度(Mtco)、7月平均降水量(Mpwa),但低λ1/λ2值表明气候因子的相对解释力较弱,在气候重建时需谨慎对待;5)亚热带地区孢粉种类指示不同的气候条件,如栲属、大戟科(Euphorbiaceae)、野桐属(Mallotus)和枫香树属(Liquidambar)等孢粉种类喜湿喜暖,而桤木属、桦木属(Betula)、榛属(Corylus)、落叶栎类和硬叶栎类(Quercus-sclerophyllous type)等孢粉种类更倾向于分布在寒冷气候环境中。The subtropical zone of China(22°~34°N,98°~123°E)is located in the main influence area of East Asian summer monsoon(ESM)and Indian summer monsoon(ISM).Paleoclimate reconstruction in this region is crucial for understanding global climate change.Modern pollen processes play an important role in the quantitative reconstruction of paleoenvironment using fossil pollen data.Based on 1140 surface pollen samples,the distribution of surface pollen and its relationship with climate in subtropical China is analyzed with Redundancy Analysis(RDA).The results show that:(1)There were abundant pollen taxa in the subtropical zone,such as Pinus,Castanopsis,Cyclobalanopsis,Alnus and Quercus.Five vegetation zones are characterized with different pollen assemblages.(2)The distribution of pollen exhibited significant changes in longitude,latitude,and altitude,with the specific percentage of pollen indicating geographic variations.(3)The winter mean precipitation(MWP)is a crucial climatic factor influencing the distribution of surface pollen in subtropical China and should be prioritized in selecting quantitative reconstruction parameters.Additionally,mean temperature in January(Mtco),mean relative humidity in winter(MWH),mean temperature in July(Mtwa),and mean relative humidity in July(Mhwa)also significantly impact surface pollen distribution.(4)The main climatic factors controlling surface pollen distribution in the north subtropical,eastern mid-subtropical,southeastern subtropical,western mid-subtropical and southwestern subtropical regions are annual mean temperature(MAT),summer mean relative humidity(MSH),winter mean precipitation(MWP),mean temperature in January(Mtco),and July mean precipitation(Mpwa),respectively.However,the lowλ1/λ2 ratio suggests that the relative explanatory power of climate variables is limited,and caution should be exercised when utilizing them in climate reconstruction.(5)Different pollen taxa are associated with distinct climatic conditions.For instance,pollen taxa such as Castanopsis,Euphorbiacea

关 键 词：亚热带 表土孢粉 分布规律 气候因子 RDA分析 

分 类 号：Q944.571[生物学—植物学] Q948.112