刘金亮^1,2,,
尹希杰³,
濮鸿雪⁴,
陈晔^4,,,
薛滨¹,
张立军⁵
1. 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, 江苏 南京 210008
2. 中国科学院大学, 北京 100049
3. 国家海洋局 第三海洋研究所, 福建 厦门 361005
4. 南京师范大学地理科学学院, 江苏 南京 210023
5. 神农架林区气象局, 湖北 神农架 442400

基金项目: 国家自然科学基金项目（批准号：41373011）资助


详细信息

作者简介: 刘金亮, 男, 26岁, 博士研究生, 自然地理学专业, E-mail:liujlia@163.com

通讯作者: 陈晔, E-mail:chenye@njnu.edu.cn

中图分类号: Q948;P532;P941.78

收稿日期:2018-03-05
修回日期:2018-04-03
刊出日期:2018-07-30

Characteristics of δ¹⁸O of the different components of plants and it's climatic significance in the Dajiuhu peatbog, Central China

Liu Jinliang^1,2,,
Yin Xijie³,
Pu Hongxue⁴,
Chen Ye^4,,,
Xue Bin¹,
Zhang Lijun⁵
1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu
2. University of Chinese Academy of Sciences, Beijing 100049
3. Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, Fujian
4. School of Geography Science, Nanjing Normal University, Nanjing 210023, Jiangsu
5. Shennongjia Forestry District Meteorological Bureau, Shennongjia 442400, Hubei


More Information

Corresponding author: Chen Ye,E-mail:chenye@njnu.edu.cn

MSC: Q948;P532;P941.78

--> Received Date: 05 March 2018
Revised Date: 03 April 2018
Publish Date: 30 July 2018


摘要
摘要:最初****利用泥炭植物同位素重建气候变化是参考树轮的研究方法，而树轮中不同组分的同位素对气候变化的响应不同。泥炭地植物不同组分的同位素对气候的响应是否也存在差异，需要进一步探讨和研究。此外，不同泥炭地植物δ¹⁸O的气候学解译存在一定的争议，这些解译的差异要求我们在利用泥炭δ¹⁸O重建古气候时需结合泥炭地现代过程的监测。文章以中国东部季风区的大九湖泥炭地为研究区域，测试研究区现代植被α纤维素与综纤维素的δ¹⁸O，对比两者的分布特征及其在时间序列上的相关性，进而探讨它们对气候因子的响应程度。结果表明：大九湖泥炭地植物δ¹⁸O分布较离散，平均值为25.09‰，α纤维素的δ¹⁸O比综纤维素δ¹⁸O偏正0.79‰~1.06‰，两种组分的δ¹⁸O在季节变化序列上没有明显的相关性。通过与区域气候因子的对比，我们发现温度是影响该地区植物δ¹⁸O变化的主要因素，而且植物α纤维素的δ¹⁸O比综纤维素的δ¹⁸O对温度响应更敏感，植物α纤维素更适用于作为研究古气候变化的载体，这一结果为中国东部季风内将泥炭地植物α纤维素的δ¹⁸O作为温度变化的代用指标提供了实验支持。
关键词: 大九湖泥炭地/
α纤维素/
综纤维素/
δ¹⁸O/
气候要素

Abstract:Peat has been recognized as an important geological archive on the reconstruction of Late Quaternary climate change(especially the paleoclimatic changes during Holoence). It is particularly suitable for isotopic geochemistry studies. At first, using plants stable oxygen isotope to reconstruct climate change was reference the tree ring study. The climate implications of stable isotope ratios in different components from tree ring vary locality. We should know that whether this phenomenon also exists in different components of stable isotope ratios peat plants. Besides, a comparison of different regions shows that the climate implications of the values of δ¹⁸O from peat plant cellulose vary with locality. The difference of interpretation about the significance of δ¹⁸O requires that we should provide modern process research about the peat bog when we use δ¹⁸O to reconstruct the palaeoclimate. The Dajiuhu peat(31°24'~31°33'N, 109°56'~110°11'E; 1730 m a.s.l.) is located in the west of the Shennongjia Forest District, Hubei Province, Central China. The wetlands are rich in biological species, giving priority to meadow vegetation and swamp vegetation and having well-preserved moss vegetation. We sampled modern plants from the Dajiuhu Basin, resulting in a total of 24 samples, mainly include Carex argyi, Sanguisorba officinalis, Polytrichum commune and Typha orientalis Presl. In this study, the δ¹⁸O values of different tissue components of plants in the Dajiuhu peatbog were analyzed, and correlation analysis was performed on climatic factors influencing the holocellulose and α-cellulose values of δ¹⁸O in plants of this area. The test results show that δ¹⁸O values of α-cellulose range from 21.08‰~29.09‰ and δ¹⁸O values of holocellulose range from 19.83‰~29.09‰. Values of δ¹⁸O are more dispersed in this area, with the average of 25.09‰. Carex plants have more enrichment of the heavy oxygen isotopes than the moss plants. On the basis of relative analyses, there were no significant correlations between α-cellulose and holocellulose in the time series. At the same time, the relationship between δ¹⁸O of α-cellulose and climate or environment factors was statistically significant. On the contrary, there were no significant correlations between holocellulose and climate or environment factors. The results indicate that temperature is a major factor influencing the values of δ¹⁸O in plants of this area. We found that δ¹⁸O of α-cellulose are more susceptible to climatic conditions. Therefore, the δ¹⁸O values of α-cellulose are more suited to study past climate changes. Our results confirmed previous argument that the δ¹⁸O values of peat cellulose could indicate the change in temperature in the monsoonal area of China.
Key words:Dajiuhu peatbog/
α-cellulose/
holocellulose/
δ¹⁸O/
climate factors



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