摘要
判断生命效应存在与否是利用双壳类壳体碳同位素提取古水体信息首要面临的问题。以2007-01-09和2007-08-10在贵州花溪河采集的河蚬作为样品数据源,对该地区河蚬壳体碳同位素进行了研究。结果表明:1号壳体和2号壳体的δ13Car变化范围分别为-11.12‰～-7.45‰和-11.36‰～-8.42‰,δ13Car时间序列显示出随壳高增大而呈负向变化,变幅最大达到3.76‰;而18个不同大小个体δ13Car的变化范围为-9.60‰～-11.27‰,δ13Car与壳高之间存在显著负相关关系。壳体碳同位素的负漂移现象是由于生物在生长过程中利用富集12C的代谢碳比例逐渐增加造成的,因此其可以用来指示壳体碳同位素生命效应的存在。
Information about ancient host water of bivalve shells can be extracted by using carbon isotope,however,whether the vital effect existed or not must be determined.In this paper Carbon isotope of morden bivalve Corbicula fluminea in the Huaxi River in Guizhou is studied.The results show that：δ^13Car of Shell 1 and Shell 2 ranges from-11.12‰ to-7.45‰ and-11.36 ‰ to-8.42‰ respectively,δ^13Car shows ontogenic decreases,the maximum amplitude reaches 3.76‰,moreover,δ13Car of 18 individuals of different sizes ranges from-9.60‰ to-11.27‰,that shows a significant negative correlation between δ^13Car and shell height.Negative excursion of δ^13Car is due to the increasing proportion of metabolic C during the individuals growth,so ontogenic decreases of δ^13C of bivalve shell can be used as the evident of vital effect（metabolic effects）.
出处
《热带地理》
北大核心
2011年第6期545-548,共4页
Tropical Geography
基金
国家自然科学基金项目(40403010)
许昌学院科研项目(2011A004)
关键词
生命效应
碳同位素
河蚬
花溪
vital effect
carbon isotope
Corbicula flumine
Huaxi river
