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地球科学进展  2004, Vol. 19 Issue (5): 793-801    DOI: 10.11867/j.issn.1001-8166.2004.05.0793
综述与评述     
土壤碳动力学同位素示踪研究进展
陶贞1, 2;沈承德1;易惟熙1;高全洲2
中国科学院广州地球化学研究所,广东广州510640;中山大学地理科学与规划学院,广东广州510275
PROGRESSES IN THE STUDY OF CARBON ISOTOPES TRACING OF THE SOIL CARBON DYNAMICS
TAO Zhen1, 2,SHEN Cheng-de1,YI Wei-xi1,GAO Quan-zhou2
1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. School of Geography and Planning, Zhongshan University, Guangzhou 510275, China
 全文: PDF(328 KB)  
摘要:

土壤是陆地生态系统中最大的碳库。土壤碳动力学旨在研究土壤有机碳库的大小及更新速率。土壤有机碳库可分为 3个亚碳库:"活动"、"缓慢"和"稳定"碳库。碳同位素特别是 14 C可作为研究土壤碳动力学的理想示踪剂;δ 13 C值是定量研究C3和C4植被更替历史的有效手段; 14 C示踪及年代测定与 13 C信号联合使用,可以估算土壤碳库的大小和驻留时间。碳同位素示踪应用于土壤碳动力学研究取得了较大进展,但是由于缺乏可靠的全球数据库和标准方法来量化土壤有机碳库,导致对土壤各亚碳库的大小和更新速率以及土壤CO2的估算仍存在较大的不确定性,从而难以估计土壤碳库大小的变化对大气CO 2浓度和全球气候变化的潜在贡献。

关键词: 碳同位素更新速率全球变化土壤有机质土壤碳动力学    
Abstract:

Soils are the largest carbon reservoir in terrestrial ecosystems. Soil organic matter contains generally three identifiable carbon pools: “active” pool; “slow” pool and “passive” pool. The dynamics of the soil carbon cycle focus on mostly carbon turnover times and input rates and size of soil carbon pools on various time scales. Many researchers indicated that natural abundance of carbon isotopes, in particular radiocarbon,is useful tracers in the study of the soil carbon cycle. δ13C values of soil organic matter provide a unique tool for quantifying historical shifts between C3 and C4 ecosystems over decadal to millennial time scales. 14C signature, the combination of 14C dating and 13C signature can be used to determine the size and turnover rates of the labile and stable soil organic matter pools. Despite the advances in the study of the soil carbon cycle by means of carbon isotopes signature in  recent decades, the isotopic approaches to the study of the soil carbon cycle have limitations. Tremendous uncertainties exist in the estimation of sizes and turnover times of soil carbon pools as well as the amount of  14C content of SOM derived CO2 because of a lack of reliable global database and a lack of standard methods available to quantify labile and stable soil organic matter pools. It is very difficult to estimate any change in the size of the soil C pool that could potentially alter the atmospheric CO2concentration and the global climate.

Key words: Carbon isotopes    Turnover time    Soil carbon dynamics    Soil organic matter    Global changes
收稿日期: 2003-10-16 出版日期: 2004-10-01
:  S153    
基金资助:

国家自然科学基金重点项目“典型气候带森林土壤碳循环及碳汇估算的同位素示踪研究” (编号:40231015); 广东省自然科学基金项目“典型水文过程流域生源物质侵蚀通量及性质研究 ” (编号:031548); 国家重点基础研究发展规划项目“我国生存环境演变和北方干旱化趋势预测”(编号:G1999043401);中国科学院知识创新工程重要方向项目“我国自然环境分异偶合过程与发展趋势” (编号:KZCX2-SW-118)资助

通讯作者: 陶贞(1965-),女,河南省沁阳人,博士研究生,主要从事地球化学与第四纪地质研究.     E-mail: E-mail: eesgqz@zsu.edu.cn
作者简介: 陶贞(1965-),女,河南省沁阳人,博士研究生,主要从事地球化学与第四纪地质研究.E-mail: eesgqz@zsu.edu.cn
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陶贞;沈承德;易惟熙;高全洲. 土壤碳动力学同位素示踪研究进展[J]. 地球科学进展, 2004, 19(5): 793-801.

TAO Zhen,SHEN Cheng-de,YI Wei-xi,GAO Quan-zhou. PROGRESSES IN THE STUDY OF CARBON ISOTOPES TRACING OF THE SOIL CARBON DYNAMICS. Advances in Earth Science, 2004, 19(5): 793-801.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2004.05.0793        http://www.adearth.ac.cn/CN/Y2004/V19/I5/793

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