外源对太湖河口沉积物有机质贡献的同位素示踪

曾海鳌; 吴敬禄

doi:10.3724/SP.J.1140.2009.01109

外源对太湖河口沉积物有机质贡献的同位素示踪

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

基金项目:

国家自然科学基金项目(40673015)

中科院知识创新工程项目(KZCX2-YW-319)

详细信息

作者简介:
曾海鳌(1980-),男,助理研究员,从事环境地球化学研究,E-mail:zenghaiao@niglas.ac.cn

中图分类号: P593
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出版历程
- 收稿日期: 2008-10-26
- 修回日期: 2009-01-05

ISOTOPIC TRACING OF TERRESTRIAL CONTRIBUTION TO ORGANIC MATTER OF SEDIMENTS IN THE ESTUARY OF TAIHU LAKE BASIN

State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences. Nanjing 210008, China

摘要

摘要: 分析了太湖流域不同土地利用类型土壤、河口表层沉积物及主要生物的有机碳含量和同位素分布特征,并利用端元混合法求取了陆源输入对湖泊沉积物有机质的贡献及分布。研究结果表明,流域表层土壤有机质δ¹³C受植物群落的δ¹³C值影响,不同植被类型的土壤有机质δ¹³C值存在差异。茶园、菜地、林地和农田δ¹³C_org平均值分别为-25.4‰、-25.8‰、-27.1‰和-28.1‰,其中茶园有机碳同位素值最高。河口表层沉积物有机碳同位素变化范围为-27.5‰~-25.1‰,平均值为-25.7‰。河口近岸区域表层沉积物δ¹³C_org偏低,且以河口为轴心向湖心逐渐增大,呈扇形条状分布,其分布主要受低δ¹³C值的陆源有机质输入影响。利用端元混合法求得近河口表层沉积物中陆源有机质贡献高达70%~80%,随着离岸距离的增加,陆源有机质贡献量逐渐减少。
- 有机质来源 /
- 碳同位素 /
- 土地利用类型 /
- 沉积物 /
- 太湖流域
Abstract: The authors analyzed characteristics of organic carbon content and isotope distribution of top soil in different Land use types within the Taihu Lake basin, as well as surface sediments and organisms within the estuary. The sources of organic matter of lake sediments were obtained by using two-member mixing model. The results showed that there were differences of organic δ¹³C in different plant types, which affected organic δ¹³C of top soil within the catchment. The average δ¹³C_org values of tea plantations, vegetable lands, forest lands and paddy fields were -25.4‰,-25.8‰,-27.1‰ and -28.1‰ respectively,and the highest δ¹³C_org value existed in tea plantations. The range of δ¹³C_org values of surface sediments within the estuary were -27.5‰~-25.1‰ with the average value of -25.7‰. The δ¹³C_org of surface sediments near the shore was low, and gradually decreased from the estuary to center. The reason was the effect of import of terrestrial source with lower δ¹³C_org values. By using two-member mixing model, the contribution ratios of terrestrial source was 70%~80% in the estuary, and gradually decreased with the distance to the lake shore.
- organic sources /
- carbon isotope /
- land use types /
- sediments /
- Taihu basin

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