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引用本文:羊向东,吴艳宏,朱育新,王苏民,沈吉.龙感湖钻孔揭示的末次盛冰期以来的环境演化.湖泊科学,2002,14(2):106-109. DOI:10.18307/2002.0202
YANG Xiangdong,WU Yanhong,ZHU Yuxin,WANG Sumin,SHEN Ji.Environmental Changes Revealed by Lacustrine Sediment from Longgan Lake since Last Glacial Maximum. J. Lake Sci.2002,14(2):106-109. DOI:10.18307/2002.0202
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龙感湖钻孔揭示的末次盛冰期以来的环境演化
羊向东, 吴艳宏, 朱育新, 王苏民, 沈吉
中国科学院南京地理与湖泊研究所, 南京210008
摘要:
通过龙感湖滩地钻孔 2 4.4m深度以内的沉积物岩性、生物和物理指标分析,在14C年代测定的基础上,对龙感湖末次盛冰期以来的环境演化进行了恢复.15.0kaBP前和 10.0-6 3kaBP,龙感湖区发育河流沉积,以低生物量和高磁化率为特征;约 15.0-10.0kaBP期间的晚冰期,龙感湖首次成湖,湖泊中生物量明显提高;现代龙感湖雏形始于约 6.3kaBP后,至 3.7kaBP后发展为稳定的湖泊环境.此外,花粉结果显示,龙感湖湿地植被大致形成于 3.3kaBP后.然而,龙感湖的成因和演化,及其与长江关系的研究,还必须重视对沉积物物源的追踪.
关键词:  龙感湖  末次盛冰期  环境演化  沉积物物源
DOI:10.18307/2002.0202
分类号:
基金项目:国家自然科学基金(49802015);中国科学院创新项目(KZCX2-302)共同资助
Environmental Changes Revealed by Lacustrine Sediment from Longgan Lake since Last Glacial Maximum
YANG Xiangdong, WU Yanhong, ZHU Yuxin, WANG Sumin, SHEN Ji
Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
Longgan Lake is located in the lower reaches of the Yangtze River.Based on the sediment pigments, total organic carbon, pollen, grains and susceptibilities, combining with 14C dating, the environmental evolutions were reconstructed since the Last Glacial Maximum.Before 15.0kaBP and during 10.0-6.3kaBP, the Longgan Lake was characterized by river deposition with lower productivity and higher susceptibility.During 15.0-10.0kaBP, Longgan Lake was formed initiated, as documented by obvious increase of organic production.The rudiment of the lake started from 6.3 kaBP, followed by the stable lake condition after 3.7kaBP.The wetland vegetation was extablished around the lake area after 3.3kaBP.It is necessary, however, to track the changes of sediment source, in order to study the mechanism of lake formation and evolution in Longgan lake, as well as the relationship between the lake and Yangtze River.
Key words:  Longgan Lake  Last Glacial Maximum  environmental changes  tracking of sediment source
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