新疆伊犁河谷风沙沉积晚全新世孢粉记录及气候变化  

Late Holocene Climate and Environment Changes Inferred from Pollen Recorded in Takelmukul Desert in Yili Valley of Xinjiang,China

作　　者：姜修洋[1,2] 李志忠[1,2,3] 陈秀玲[1,2] 靳建辉[1,2] 

机构地区：[1]福建师范大学地理科学学院,福建福州350007 [2]福建省亚热带资源与环境重点实验室,福建福州350007 [3]新疆师范大学地理科学与旅游学院,新疆乌鲁木齐830054

出　　处：《中国沙漠》2011年第4期855-861,共7页Journal of Desert Research

基　　金：国家"十一五"科技支撑计划项目(2007BAC15B07);新疆维吾尔自治区自然科学基金项目(200821103)共同资助

摘　　要：通过地处亚洲中部干旱区的新疆伊犁河谷塔克尔莫乎尔沙漠沉积剖面(TKP)73块孢粉样品的鉴定分析,结合光释光(OSL)测年数据,获取了TKP沉积剖面晚全新世(约3.78～0ka BP)植被变化特征与古气候历史。TKP剖面孢粉资料揭示出该研究区3.7ka BP以来经历了多次的气候干湿波动,大致以2.2ka BP为界,分为前后两个时期,前期孢粉总浓度较低,平均仅有5粒.g-1,主体表现为沙漠,气候整体干旱;后期孢粉总浓度明显增加,平均为85粒.g-1,为荒漠植被,并存在4个相对干湿的变化阶段;最近0.3ka BP以来,孢粉总浓度并不十分丰富(33粒.g-1),整体表现变干的趋势。TKP剖面孢粉资料反映的晚全新世干湿波动与其他相邻区域具有较好的可比性,具有区域一致性特征。在小冰期时TKP剖面表现为冷湿的气候特征,有可能是受到中高纬度北大西洋气候变化的影响。Based on the pollen analysis on a desert sediment profile in Yili valley of Xinjiang,combined with optically stimulated luminescence ages,the characteristics of paleovegetation and paleoclimate evolution since 3.7 ka BP were reconstructed.The record reveals that the study area has experienced alternations of relative arid and wet and could be divided into two stages before and after 2.2 ka BP.In the first stage（3.7~2.2 ka BP）,the total concentration of pollen is very barren by an average of 5 grains·g-1,and indicates a relatively arid desert climate;in the latter phase（2.2~0.3 ka BP）,the total concentration of pollen significantly increases by an average of 85 grains·g-1,and suggests a relative wet climate as a whole.The latter stage can also be divided into four relatively wet and dry sub-stages.The total concentration of pollen is relatively low（33 grains·g-1） during the last 0.3 ka,and it shows a relatively dry climate.The climate changes in the research area agree well with that of neighboring regions.The record indicates a lower temperature and humid climate during the Little Ice Age within the study area,and the cooling of the north Atlantic may exerts important influence on the climate change in arid central Asia.

关 键 词：孢粉 晚全新世 西风模式 伊犁河谷 

分 类 号：P532[天文地球—古生物学与地层学]