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Early Holocene Climatic Changes and Agricultural Activities Inferred from Spore-Pollen of Lop Nur

JIA Hong-juan1,2,LIU Jia-qi1,QIN Xiao-guang1 1.Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2.Geologic Environment Division,Korea Institute of Geoscience and Mineral Resources,Daejeon 305-350,Korea  
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.
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