摘要
为研究全新世罗布泊地区气候变化特征、罗布泊流域耕作活动,利用东湖湖心剖面(N40°8.965',E90°30.535')6个有机质AMS14C结果建立年代框架,剖面以5 cm间隔采样25块做孢粉分析。孢粉分析结果显示云杉花粉有河流携带特征,云杉含量增加说明流域来水量增加,气候湿润。根据孢粉组合可将剖面划分为3个带,1、2带又分别划分为2个亚带。1带深度为57～120 cm,流域水分逐渐减少,环境逐渐恶化;2带深度为22～57 cm,乔、灌木植物花粉和草本植物花粉含量基本稳定,以草本植物花粉为主;3带深度为0～22 cm,气候湿润。其中,1A、2A亚带和3带气候相对湿润,有耕作活动。结果表明:全新世早期罗布泊流域耕作活动的出现与消亡受气候变化控制,耕作活动出现在气候湿润时期,干旱时耕作活动消失;全新世早期罗布泊流域有过干旱时段。
The East lake Lop Nur section(N40°8.965,E90°30.535) Xinjiang,China was selected for reconstructing the climate variations and agricultural activities of the Lop Nur drainage.Six samples from East lake Lop Nur section were collected for AMS14C dating.25 samples were collected at 5cm intervals for pollen analysis.Picea is over-representative and mainly transported by water.At humid phase the percentage of Picea increases.According to pollen assemblage the section can be divided into three zones.Zone one and two have been divided into two sub-zones.Zone 1 is 57-120 cm thick,and being formed in a drought climate.Content of arbors,shrubs and herbs are stability in the zone 2.Zone 3 is with a depth of 0-22 cm,when climate was humid and agricultural activities appeared.Pollen data demonstrate that Early to Middle Holocene has agricultural activities at Lop Nur drainage.Environmental or climatic shifts often result in agriculture appearing or collapsing.At humid phase agricultural activities emerge.At drought phase agricultural activities die.There have had some drought stages at Lop Nur region in Early Holocene.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2011年第S1期181-186,194,共7页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金面上项目(40472094
40772212)
中国工程院重大咨询项目(2008-ZD-05)
韩国基金项目(GP2009-005)
关键词
罗布泊
全新世
气候变化
孢粉
耕作活动
Lop Nur
Holocene
climatic change
pollen
agricultural activities
