海洋地质与第四纪地质2012，Vol.32Issue(6)：165-171,7.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
C, N STABLE ISOTOPE RECORDS OF ENVIRONMENTAL CHANGES IN BOSTEN LAKE DURING THE PAST 200 YEARS
摘要
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, δ13Corg 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 δ13Corg and lower δ15N in the core BST16. Since 1950 AD, large scale agricultural activities have led to the rapid decrease in δ13 Corg and increase in δ15N, indicating a general increase in the trophic level. Further decrease in δ15N together with the increasing δ13Corg after the 1990's indicates that nitrogen fixation by algae began to dominate the lake primary productivities.关键词
有机碳、氮稳定同位素/湖泊环境变化/博斯腾湖Key words
stable isotopes of organic carbon and nitrogen/ primary productivity/ nutrient change/ Bosten Lake分类
天文与地球科学引用本文复制引用
郑柏颖,曹艳敏,张恩楼,高光..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[J].海洋地质与第四纪地质,2012,32(6):165-171,7.基金项目
环保公益性行业科研专项(200909048) （200909048）
水专项课题(2009ZX07106-0040) （2009ZX07106-0040）
