博斯腾湖近200年来湖泊环境变化的有机碳氮稳定同位素记录

郑柏颖; 曹艳敏; 张恩楼; 高光

doi:10.3724/SP.J.1140.2012.06165

博斯腾湖近200年来湖泊环境变化的有机碳氮稳定同位素记录

郑柏颖^1,2,
曹艳敏^1,2,
张恩楼^1, ,,
高光¹

1 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, 南京 210008;
2 中国科学院研究生院, 北京 100049

基金项目:

水专项课题(2009ZX07106-0040)

环保公益性行业科研专项(200909048)

详细信息

作者简介:
郑柏颖(1987-),男,硕士生,主要从事湖泊沉积与环境演化研究,E-mail:zby104@126.com

中图分类号: P597
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出版历程
- 收稿日期: 2012-05-25
- 修回日期: 2012-08-16

C, N STABLE ISOTOPE RECORDS OF ENVIRONMENTAL CHANGES IN BOSTEN LAKE DURING THE PAST 200 YEARS

1 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 通过对新疆博斯腾湖河口区与敞水区沉积岩心中有机碳、氮稳定同位素分析,结合烧失量、粒度、磁化率等指标,在²¹⁰Pb、¹³⁷Cs年代测定的基础上,探讨博斯腾湖近200年来有机质来源变化以及湖泊环境变化过程,结果表明,博斯腾湖流域的农业活动对湖泊敞水区的影响比河口区早。1810-1883年间由于流域内气候由湿转干,湖泊水位下降导致较多陆源物质到达湖泊敞水区,δ¹³C_org快速下降而δ¹⁵N快速上升。1884年新疆建省后,农业活动导致BST16岩心的颗粒变小,δ¹³C_org偏负而δ¹⁵N偏正。1950年后大规模的农业活动导致BST13岩心的δ¹³C_org降低、δ¹⁵N升高,BST16岩心的δ¹³C_org缓慢上升说明湖泊营养水平开始缓慢上升。1900年后BST16岩心的δ¹⁵N快速下降与δ¹³C_org进一步上升表明了初级固氮藻类增加,湖泊初级生产力进一步提高。
- 有机碳 /
- 氮稳定同位素 /
- 湖泊环境变化 /
- 博斯腾湖
Abstract: Two sediment cores were recovered from the Bosten Lake in order to investigate the changes in both the lake system and source of organic materials during the last 200 years.Based on ²¹⁰Pb/¹³⁷Cs chronology, stable isotopes of organic carbon and nitrogen as well as Loss on Ignition (LOI), grain size and magnetic susceptibility (MS) were analyzed.The results indicate that the agricultural activities in the catchment of the Bosten Lake have much earlier influence in the lake center rather than in the river mouth.Due to the general increase in regional humidity during 1810-1883 AD, δ¹³C_org declined rapidly in the core BST16, while abrupt increases in δ¹⁵N were found as more terrestrial material could reach the lake center.After the establishment of Xinjiang Province in 1884 AD, intensified agricultural activities have led to marked decrease in the medium grain size, and relatively higher δ¹³C_org and lower δ¹⁵N in the core BST16.Since 1950 AD, large scale agricultural activities have led to the rapid decrease in δ¹³C_org and increase in δ¹⁵N, indicating a general increase in the trophic level.Further decrease in δ¹⁵N together with the increasing δ¹³C_org after the 1990's indicates that nitrogen fixation by algae began to dominate the lake primary productivities.
- stable isotopes of organic carbon and nitrogen /
- primary productivity /
- nutrient change /
- Bosten Lake

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