| 环境因素对蜗牛Achatina fulica壳体碳酸盐δ13C
组成影响的实验研究 |
| |
| 引用本文： | 朱莉莉,鲍睿,盛雪芬.环境因素对蜗牛Achatina fulica壳体碳酸盐δ13C
组成影响的实验研究[J].高校地质学报,2015,21(2):357. |
| |
| 作者姓名： | 朱莉莉 鲍睿 盛雪芬 |
| |
| 摘 要： | 陆生蜗牛化石稳定同位素组成是一种良好的古环境信息载体，常被用于古环境古气候的重建。由于缺少古环境因子
对蜗牛壳体稳定同位素组成机理性的结论，因此越来越多的研究侧重于对现代蜗牛壳体的环境效应进行探讨。实验室蜗牛
饲养实验则可以通过控制环境因素来确定其对壳体碳酸盐稳定同位素组成的影响程度，从而得到较为确切的结果。该文在
前人的研究基础上，利用Achatina fulica 进行实验室饲养实验。结果表明，在相同的温、湿度下，同种食物喂养的蜗牛壳体
有非常稳定的分馏值，不同食物类型的结果有一定的差异，莴苣叶、玉米粉和饲料喂养的蜗牛壳体相对于食物的分馏值分
别为16.70‰±0.2‰，10.57‰±0.2‰和10.65‰±0.2‰；在20~30℃实验条件下，壳体δ13C并不受环境温度的影响，主要受食
物的影响，并得到两者之间的回归方程为δ13Cs=0.6665δ13Cv+6.2302（n=26）；无机碳酸盐对Achatina fulica 壳体文石δ13C值影
响很少；根据端元组分分析方法的统计结果显示，食物是Achatina fulica 壳体碳同位素组成的主要影响因素，贡献值约为
80％±5％，除此以外，大气CO2的贡献值约为20％±5％。
|
| 关 键 词： | 环境因素 Achatina fulica 碳同位素组成 壳体与食物之间分馏值 |
Experimental Study on the Effect of Environmental Factors on the
Carbon Stable Isotope Composition of the Snail Achatina fulica
Shell carbonate |
| |
| ZHU Lili,BAO Rui,SHENG Xuefen.Experimental Study on the Effect of Environmental Factors on the
Carbon Stable Isotope Composition of the Snail Achatina fulica
Shell carbonate[J].Geological Journal of China Universities,2015,21(2):357. |
| |
| Authors: | ZHU Lili BAO Rui SHENG Xuefen |
| |
| Abstract: | The stable isotope composition of land snail shell fossil is correlated with the paleo-environmental information, and therefore
could be used to reconstruct the palaeo-environment. However, the debate continues on the mechanism how paleo-environment factors
affect the stable isotope composition of snail shell carbonate. Recent studies focus more on the δ13C value of the modern land snail shell
carbonate which could be applied to indicate the environmental and climatic information. The laboratory cultured experiment can
isolate the contribution of each particular environmental factor to the δ13C value of the snail shell carbonate. In this study, the cultured
experiments on the snail Achatina fulica were carried out to investigate the carbon isotope fractionation between snail shell carbonate
and their diets，The results show that under constant temperature and humidity there are stable fractionation offsets among the shell
carbonates when the snails were fed by the same diet. The different types of diets caused the correspondingly different carbon isotope
fractionation: the average fractionation offsets between the shell carbonate and the diets of the lettuce, the corn and the forage are 16.70‰±0.2‰, 10.57‰±0.2‰, 10.65‰±0.2‰, respectively. The experiment also confirms that the incubators temperature ranging
from 20 to 30oC does not affect thefractionation offset of 13C between the snail shell and its diet. An empirical equation between the δ13C
values from the shell carbonate ofAchatina fulica and the diets can be described as δ13Cs=0.6665δ13Cv+6.2302 (n=26). The inorganic
carbonate has negligible effect on the δ13C value of snail shell. According to the result of the end-member analysis, we concluded that
the diet contributes dominantly to the carbon stable isotope composition of the shell carbonate of snail Achatina fulica with the
contribution being about 80％±5％, and the another one, i.e, from the atmospheric CO2 , being 20％±5％. |
| |
| Keywords: | environmental factors Achatina fulica δ13C of shell aragonite the carbon isotopic fractionation between the shell and diets |
|
| 点击此处可从《高校地质学报》浏览原始摘要信息 |
| 点击此处可从《高校地质学报》下载免费的PDF全文 |
