干旱区生态环境知识资源中心(Arid): 岱海~(14)C测年的现代碳库效应研究

Arid

	岱海~(14)C测年的现代碳库效应研究
其他题名	MODERN RESERVOIR AGE FOR ~(14)C DATING IN DAIHAI LAKE
	吴艳宏 1; 王苏民 1; 周力平 2; 孙照斌 1
ISSN	1001-7410
出版年	2007
卷号	27 期号:4 页码:507-510
中文摘要	碳库效应的复杂性是影响建立湖泊沉积物高精度年代序列的一大障碍。本项研究通过我国内蒙古半干旱区封闭湖泊表层沉积物、湖水、现生沉水植物狐尾藻、现生鲤鱼鱼骨和湖岸表层土壤等一系列样品的~(14)C年代测定，表明现代岱海确实存在碳库效应。碳库效应年龄因湖水盐度在湖区的不均而有所变化，岱海西部湖区弓坝河径流补给量大，湖水盐度较东部稍低，碳库效应年龄也略小于东部湖区。表层沉积物中有机质包含浮游生物和沉水植物的混合信息，因而其碳库效应年龄较沉水植物年龄轻，岱海湖心表层沉积物碳库效应年龄在2000a左右。这一碳库效应年龄较通过沉积钻孔~(14)C年龄线性回归获得的年龄偏大，可能的原因是在时间序列上碳库效应并非恒定。
英文摘要	Reservoir effect on ~(14)C dating is a common problem in marine and lacustrine sediments. Our knowledge of reservoir ages, either modern or ancient, is still very limited. We present here a series of ~(14)C ages of lake surface sediments, lake water, submerged aquatic plant (Myriophyllum) , fish (Cyprinus carpio) bone, and surface soil samples from the Daihai Lake, which is a closed lake located in semi-arid area of Inner Mongolia, China, in order to evaluate the modern reservoir age. Our results confirm that in the Daihai Lake, modern reservoir effect does exist in surface lake sediments, lake water, soil, submerged aquatic plant and even in the fish bones. The modern reservoir age varies with salinity in different parts of the lake. In western part of the lake, which is fed by more fresh water from the Gongba River, the salinity is a little lower than in the eastern part. The reservoir age there is younger than that in eastern part correspondingly. The reservoir age of the surface lake sediments is younger than that of submerged aquatic plant because of the organic matter in lake sediments which is a mixture of plankton and submerged plants. The reservoir age of the surface lake sediments from the center of the Daihai Lake is estimated to be ca. 2000a. This reservoir age is significantly older than those in some recent literatures which were obtained using linear extrapolation method. A possible explanation for the discrepancy is that the reservoir effect is temporally variable.
中文关键词	~(14)C测年 ; 碳库效应 ; 湖泊沉积物 ; 岱海
英文关键词	~（14）C dating reservoir effect lake sediments, Daihai Lake
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:2839828
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220829
作者单位	1.中国科学院南京地理与湖泊研究所, 南京, 江苏 210008, 中国; 2.北京大学地理学院, 地表过程分析与模拟教育部重点实验室, 北京 100871, 中国
推荐引用方式 GB/T 7714	吴艳宏,王苏民,周力平,等. 岱海~(14)C测年的现代碳库效应研究[J],2007,27(4):507-510.
APA	吴艳宏,王苏民,周力平,&孙照斌.(2007).岱海~(14)C测年的现代碳库效应研究.,27(4),507-510.
MLA	吴艳宏,et al."岱海~(14)C测年的现代碳库效应研究".27.4(2007):507-510.