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引用本文:吴艳宏,吴瑞金,薛滨,钱君龙,肖家仪.13kaBP以来滇池地区古环境演化.湖泊科学,1998,10(2):5-9. DOI:10.18307/1998.0202
Wu Yanhong,Wu Ruijin,Xue Bin,Qian Junlong,Xiao Jiayi.Paleoenvironmental Evolutionin Dianehi Lake Area since 13kaBP. J. Lake Sci.1998,10(2):5-9. DOI:10.18307/1998.0202
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13kaBP以来滇池地区古环境演化
吴艳宏1, 吴瑞金1, 薛滨1, 钱君龙1, 肖家仪2
1.中国科学院地理与湖泊研究所湖泊沉积与环境开放实验室, 南京 210008;2.南京师范大学地理科学学院, 南京 210097
摘要:
根据DC93一1孔孢粉组合、总有机碳(TOC)、总氮(TN)、碳氮比(C/N)、有机碳同位素δ13Corg、磁化率(χ)、频率磁化率(χfd)等资料,结合14C、210Pb和137Cs测年,滇池地区13ka以来的古环境演化历史经历了以下几个阶段:13—10.2kaBP.气候偏凉湿,湖水深度不大;10.2-7.5kaBP,气候向暖湿过渡.湖水渐深;7.5-4.0kaBP,气候暖湿,出热条件达到最佳配制,湖水也最深.6.5kaBP前后,气温最高,这一时段古气候状况存在次级波动;4.0-2.7kaBP,气候突转干旱.湖水最浅;2.7-1.7kaBP,气候温湿,湖面扩大,湖水变深;1.7kaBP,人类活动影响的加剧,使湖泊环境的变化更为复杂.
关键词:  滇池  古环境  13ka
DOI:10.18307/1998.0202
分类号:
基金项目:国家自然科学基金(49672132);中国科学院湖沼专项联合资助
Paleoenvironmental Evolutionin Dianehi Lake Area since 13kaBP
Wu Yanhong1, Wu Ruijin1, Xue Bin1, Qian Junlong1, Xiao Jiayi2
1.Lake Sedimentation and Environment Lab., Nanjing Institute of Geography Limnology, CAS. Nanjng 210008;2.College of Geographital Sciences, Nanjing Normal University, Nanjing 210097
Abstract:
Dianchi Lake (25°04 N,102°41’E ),lying to the south of Kunm ing City·the capital ofYunnan Province,is an ideaI field for studying the evolution of the Southwest M onsoon.The core D93-l is sampled in the Iake at the depth of 4.05m.The 14C ages at 0.65m. 1.7m,2,65m and 3.95m are 1 670± 1 40aBP,4540± 220aBP,6700± 160aBP and 2900± 1100aBP respectively. The sediment rate of upper layer determ ined by 210Pb and 127Cs measurement was about 1.78mm/a after 1948A,D.,and lmm/a for the Iast 250 years,Meanwhile.such environmentaI proxies as pollen assemblage.totaI organic carbon(TOC). Total nitrogen(TN)+(C/N),13Corg,magnetic susceptibility (X)and frequency dependent m agnetic susceptibility (X fd)·have been used to restore the history of environm ental evolution in the lake area since 13kaBP.As a result,Dianchi Lake has undergone the following clim atic variations since 13kaBP; 13-10kaBP.it was cool and wet;l0-7.5kaBP.it was a transitionaI period while clim atetransited to warm and wet and Iake water leveI becam e higher. 7.5-4kaBP.it was warmand wet with little variation. The highest temperature em erged about 6.5kaBP,4-2,7kaBP,the clim ate changed to cool and dry,suggesting an abrupt change in environm entalproxies,2,7-1.7kaBP+ all environmental proxies exhibited the characteristics of slightwarm and wet climate, and, lake area enlarged with lake water level uprising, Since1.7kaBP human activity has m ade a notable impact on the environm entaI evolution.
Key words:  Dianehl Lake  paleoenvironment  13kaBP
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