Sedimentary Pigment and Its Environmental Signification of East Juyanhai in Inner Mongolia since the Past 2600 Years

QU Wen chuan; WU Rui jin; WANG Su min; ZHANG Zhen ke

Organic carbon content in lake sediment is often used to indicate the lake paleoprimary productivity.The main sources of organic carbon include autochthonous lake organism and allochthonous terrestrial plant,and there is complex degradation after deposition.Therefore the total organic carbon in lake sediments only can offer rough information about lake paleoprimary productivity. Compared with organic carbon, pigments are more table and have close relationship with lake temperature,water depth,salinity,trophic status.Recently pigments are used as an effective environment index in the study of lake environmental evolution. According to the contents and assemblages of pigments and other environmental multiproxy from the sediments core of S₁ Core in East Juyanhai in Inner Mongolia, this paper mainly deals with the climatic and environmental changes during the past 2 600 years of this area.The characteristics of climate assemblages have the feature with the process of warm wet(2 540～2 650 aB.P.)→lake shrink, warm dry (2 360～2 540 aB.P.)→warm wet,lake expand(2 150～2 360 aB.P.)→cold wet to cold dry,lake shrink(1 630～2 150 aB.P.)→warm wet,lake expand(600～1 630 aB.P.)→cold wet to warm dry(600 aB.P.～present).In the meantime, the authors also try to contribute the pigment and other environmental index to evaluate the paleoprimary productivity,and to distinguish the human activities in lake records.The natural climate change played an important role in the process of environmental evolution in the area of Juyanhai Lake during the past 2 600 years, and human activities affected the lake environment greatly only in a special period.

Sedimentary Pigment and Its Environmental Signification of East Juyanhai in Inner Mongolia since the Past 2600 Years

1. Nanjing Institute of Geography and Limnology,Nanjing 210008;

2. Geography Department of Yantai Teachers College,Yantai Shandong 264025

Received Date: 1998-06-12

Rev Recd Date: 1999-09-23

Publish Date: 2000-03-10

Key words:

Abstract: Organic carbon content in lake sediment is often used to indicate the lake paleoprimary productivity.The main sources of organic carbon include autochthonous lake organism and allochthonous terrestrial plant,and there is complex degradation after deposition.Therefore the total organic carbon in lake sediments only can offer rough information about lake paleoprimary productivity. Compared with organic carbon, pigments are more table and have close relationship with lake temperature,water depth,salinity,trophic status.Recently pigments are used as an effective environment index in the study of lake environmental evolution. According to the contents and assemblages of pigments and other environmental multiproxy from the sediments core of S₁ Core in East Juyanhai in Inner Mongolia, this paper mainly deals with the climatic and environmental changes during the past 2 600 years of this area.The characteristics of climate assemblages have the feature with the process of warm wet(2 540～2 650 aB.P.)→lake shrink, warm dry (2 360～2 540 aB.P.)→warm wet,lake expand(2 150～2 360 aB.P.)→cold wet to cold dry,lake shrink(1 630～2 150 aB.P.)→warm wet,lake expand(600～1 630 aB.P.)→cold wet to warm dry(600 aB.P.～present).In the meantime, the authors also try to contribute the pigment and other environmental index to evaluate the paleoprimary productivity,and to distinguish the human activities in lake records.The natural climate change played an important role in the process of environmental evolution in the area of Juyanhai Lake during the past 2 600 years, and human activities affected the lake environment greatly only in a special period.

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Sedimentary Pigment and Its Environmental Signification of East Juyanhai in Inner Mongolia since the Past 2600 Years

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