鲍睿^1,2,,
盛雪芬^2,3,,,
陈骏²
1. 南京师范大学地理科学学院, 虚拟地理环境教育部重点实验室, 江苏 南京 210023
2. 南京大学地球科学与工程学院, 表生地球化学教育部重点实验室, 江苏 南京 210023
3. 江苏省气候变化协同创新中心, 江苏 南京 210046

基金项目: 国家自然科学基金项目（批准号：41873010和41991321）资助


详细信息

作者简介: 鲍睿, 男, 32岁, 讲师, 同位素地球化学研究, E-mail: baorui@njnu.edu.cn

通讯作者: 盛雪芬, E-mail: shenxuer@nju.edu.cn

中图分类号: P593;P532

收稿日期:2020-12-12
修回日期:2021-04-20
刊出日期:2021-07-30

Carbon and oxygen isotopic composition of land snail shells and climate

Bao Rui^1,2,,
Sheng Xuefen^2,3,,,
Chen Jun²
1. Key Laboratory of Virtual Geographic Environment, Ministry of Education, School of Geography, Nanjing Normal University, Nanjing 210023, Jiangsu
2. Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu
3. Jiangsu Collaborative Innovation Center for Climate Change, Nanjing 210046, Jiangsu


More Information

Corresponding author: Sheng Xuefen,E-mail:shenxuer@nju.edu.cn

MSC: P593;P532

--> Received Date: 12 December 2020
Revised Date: 20 April 2021
Publish Date: 30 July 2021


摘要
摘要:陆生蜗牛响应气候环境变化敏感，其壳体化石碳氧同位素组成（δ¹³C和δ¹⁸O）具有重建古生态和古大气水文条件的巨大潜力。然而目前针对中国黄土古土壤沉积序列中蜗牛化石碳氧同位素组成开展的古环境古气候重建研究却仍然不足，根源在于对蜗牛壳体δ¹³C和δ¹⁸O指标气候意义的认识仍不明确。文章从现代过程研究着手，综述了目前有关蜗牛壳体δ¹³C和δ¹⁸O气候环境意义的研究进展，并指出各自指标存在受控因子的复杂性和多解性等问题。通过总结这些研究认为：陆生蜗牛壳体δ¹³C值主要通过反映植物（尤其C₃）δ¹³C值变化来进一步响应当地降水量变化，进而指示环境的干湿程度，但同时需要考虑环境碳酸盐、大气CO₂等额外因子对壳体δ¹³C的影响；壳体δ¹⁸O值可以在较大程度上反映大气降水δ¹⁸O值变化，但同时需要考虑蒸发作用和温度等因素对壳体δ¹⁸O的影响；壳体δ¹³C和δ¹⁸O在作为气候指标时常受区域和蜗牛种属等因素影响。此外，还介绍了目前中国北方黄土地层中蜗牛壳体化石稳定同位素组成重建季风变化的研究进展和近十年来有关蜗牛壳体团簇同位素新方法的研究进展。最后，论文针对壳体δ¹³C和δ¹⁸O指标存在的问题提出可能的解决办法，并对以后蜗牛碳氧同位素古环境研究方向进行展望。
关键词: 陆生蜗牛/
壳体δ¹³C和δ¹⁸O/
植被组成/
降水δ¹⁸O/
气候变化

Abstract:The carbon and oxygen isotopic composition(δ¹³C and δ¹⁸O) of the fossil shells of land snails, which are sensitive to climatic and environmental changes, has great potential to reconstruct the palaeoecology and palaeohydrology conditions. However, the research on δ¹³C and δ¹⁸O of snail fossils from Chinese loess-palaeosol sequences is still badly lacking, because the climatic significance of shell δ¹³C and δ¹⁸O proxies is still unclear. In this paper, we review the research progress on the climatic and environmental significance of δ¹³C andδ¹⁸O in land snail shells from the perspective of modern process, and point out the complexity and multiplicity of controlled factors for each proxy. In conclusion, land snail shell δ¹³C values respond to the change of local precipitation by reflecting the change of δ¹³C value of ingested plants(especially for C₃ plants), and then indicate the humidity or aridity of an environment. However, the influence of additional factors such as environmental carbonate and atmospheric CO₂ on the shell δ¹³C value should be considered. To a certain degree, the shell δ¹⁸O can record the variation of theδ¹⁸O of meteoric water, but the influence of evaporation effect and temperature on the shell δ¹⁸O values could not be ignored. Moreover, shell δ¹³C and δ¹⁸O as climatic indicators are often region-dependent and species-dependent. In addition, this paper introduces the recent advances about the palaeomonsoon reconstructions using stable isotope compositions of snail fossils from the Quaternary loess sequences in Northern China, and the advances about the clumped isotope of snail shells during the past decade. Finally, possible solutions for solving the controversy in shell δ¹³C or δ¹⁸O climate proxy, and the main future application directions of paleoenvironment reconstruction based on stable isotope compositions of land snails, are proposed.
Key words:land snail/
shell δ¹³C and δ¹⁸O/
vegetation composition/
precipitation δ¹⁸O/
climate changes



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