湖泊科学2024，Vol.36Issue(5)：1436-1446,11.DOI:10.18307/2024.0524
杞麓湖孟氏螺蛳(Anularya mansuyi)壳体碳同位素记录的水体溶解无机碳变化
Changes in dissolved inorganic carbon recorded by carbon isotopes of the living Anularya mansuyi shells in Lake Qilu
摘要
Abstract
Carbon isotope of gastropod shell carbonates in lakes is directly correlated with dissolved inorganic carbon(DIC)in lake water,providing vital signals for the regional carbon cycle in lakes.Lakes are widely distributed in the central Yunnan region,and little is known about the DIC characteristics of these lakes.Anularya mansuyi shells are a unique genus of the lakes in central Yun-nan Province.Here,two living Anularya mansuyi shells(QLH-A and QLH-B)were collected from Lake Qilu and their carbon iso-tope composition of shell carbonate(813Cshell),longitudinally along their growth span were studied to reveal possible dissolved in-organic carbon shifts in Lake Qilu's waters.Results showed that:(1)The δ13Cshell values could be used to identify the two Anu-larya mansuyi shells'growth in the mother's internal environment,the average values of δ13Cshell were-3.78‰ and-5.55‰,with ranges of variation of 2.07‰ and 3.03‰,respectively.In lake water environment,the average δ13Cshell values of the two shells were-2.90‰ and-3.28‰,with ranges of variation of 1.81‰ and 1.74‰,respectively.(2)During the period when Anularya mansuyi grows in the lake water,the δ13Cshell recorded the δ13CDIC characteristics of lake water DIC,indicating that the DIC of the Lake Qilu water body was mainly affected by atmospheric exchange and the biological system.The δ13CDIC values of DIC showed no significant seasonal variation in Lake Qilu.(3)Followed algal bloom,the organic matter decomposition caused by the death of a-quatic algae in lake system would lead to negative δ13CDIC.Basing δ13CDIC records of 2012-2013,the negative δ13Cshell during the second half of 2013 was consistent with the Yunnan Drought Event in 2013 and revealed the 813Cshen of the Anularya mansuyi had the potential to record significant changes in the lake ecosystem.The fossil shells of Anularya mansuyi are widely distributed around lakes in central Yunnan,and these fossil shells can be used as potential documents to identify the DIC characteristics of water bodies and changes in lake ecosystems during geological historical periods.关键词
杞麓湖/孟氏螺蛳/碳同位素/水体溶解无机碳Key words
Lake Qilu/Anularya mansuyi/carbon isotope/dissolved inorganic carbon引用本文复制引用
江戈平,雷国良,朱芸,张文翔,于源,许丽红,杜垚华,李全聪,孙婉婷..杞麓湖孟氏螺蛳(Anularya mansuyi)壳体碳同位素记录的水体溶解无机碳变化[J].湖泊科学,2024,36(5):1436-1446,11.基金项目
国家自然科学基金项目(41977390)和云南省高原地理过程与环境变化重点实验开放基金项目(PGPEC201801)联合资助. （41977390）
