张风菊^1,,
薛滨^2,,,
姚书春²
1. 江苏师范大学地理测绘与城乡规划学院, 江苏 徐州 221116
2. 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

基金项目: 国家自然科学基金项目（批准号：41573129和41372185）和国家科技基础性工作专项项目（批准号：2014FY110400）共同资助


详细信息

作者简介: 张风菊, 女, 29岁, 讲师, 自然地理学专业, E-mail:fjzhang8899@163.com

通讯作者: 薛滨, E-mail:bxue@niglas.ac.cn

中图分类号: Q948;P532;P941.78

收稿日期:2018-02-28
修回日期:2018-04-12
刊出日期:2018-07-30

The organic carbon storage in Chinese lake sediments during the Holocene Megathermal

Zhang Fengju^1,,
Xue Bin^2,,,
Yao Shuchun²
1. School of Geography, Geomatics, and Planning, Jiangsu Normal University, Xuzhou 221116, Jiangsu
2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu


More Information

Corresponding author: Xue Bin,E-mail:bxue@niglas.ac.cn

MSC: Q948;P532;P941.78

--> Received Date: 28 February 2018
Revised Date: 12 April 2018
Publish Date: 30 July 2018


摘要
摘要:湖泊作为陆地生态系统的重要组成部分，在区域/全球碳循环中发挥着重要作用。研究大暖期（6±0.5 ka B.P.）湖泊沉积物有机碳储量，可为未来类似增温幅度下湖泊固碳潜力变化研究提供一定的基础数据。文章通过搜集我国不同地区65个含大暖期沉积年代及有机碳数据的湖泊资料，开展了大暖期中国湖泊沉积物有机碳储量的初步研究。结果表明，大暖期我国湖泊沉积物有机碳储量约为4.56 Pg C，变化范围约为0.90~19.08 Pg C（1 Pg=10¹⁵ g），主要集中在东部平原湖区、蒙新湖区及青藏高原湖区；有机碳累积速率约为22.3 g/（m²·a），变化范围约为4.4~92.6 g/（m²·a），其中以蒙新湖区最高，青藏高原湖区最低。大暖期我国湖泊有机碳储量与陆地碳库的比较表明，湖泊有机碳储量约为陆地（植被和土壤）有机碳储量的3%，而湖泊面积约为陆地面积的2%，加之湖泊沉积物较土壤及森林生物量能够保存更长的时间，因此湖泊在维系全球碳平衡中起着重要作用，湖泊的碳汇功能不容忽视。
关键词: 大暖期/
有机碳累积速率/
有机碳储量/
湖泊沉积物/
中国

Abstract:As an important component of the terrestrial ecosystem, lakes play an important role in the global and regional carbon cycle. Understanding and reconstructing the carbon storage in lake sediments during the Holocene Megathermal(6±0.5 ka B.P.) can contribute to the assessment of the lake carbon sequestration potential in the near future. In this study, 65 lakes with total organic carbon content(TOC) and reliable chronology of the Holocene Megathermal were chosen to determine the total carbon storage in Chinese lakes at that time period. The results showed that the carbon storage in Chinese lakes was estimated to be 4.56 Pg C(varying from 0.90 Pg C to 19.08 Pg C) (1 Pg=10¹⁵ g) during the Holocene Megathermal. The carbon stock was mainly concentrated in Eastern Plain Lake Region, Inner Mongolian-Xinjiang Lake Region and Tibet Plateau Lake Region. The average organic carbon accumulation rate(OCAR) in Chinese lakes ranged between 4.4 g/(m²·a) and 92.6 g/(m²·a), with a mean of 22.3 g/(m²·a) during the Holocene Megathermal. The Inner Mongolian-Xinjiang Lake Region had the highest OCAR, while the Tibet Plateau Lake Region had the lowest value. Furthermore, the carbon storage in Chinese lakes during the Holocene Megathermal was about 3%of that buried by terrestrial ecosystem, but in only 2%of the area. In particular, lake sediments can be preserved for quite longer times than forest biomass and soil, thus it is reasonable to conclude that lakes play a significant role in maintaining the global carbon balance and their carbon sink functions should be taken into consideration in the future.
Key words:Holocene Megathermal/
organic carbon accumulation rate/
organic carbon storage/
lake sediment/
China



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