地理研究 ›› 2018, Vol. 37 ›› Issue (4): 751-760.doi: 10.11821/dlyj201804009

• 研究论文 • 上一篇    下一篇

开封黄泛地层全新世中晚期碳密度和碳储量研究

刘德新1(), 马建华1,2(), 谷蕾1, 陈彦芳1, 吴朋飞2, 陆静1   

  1. 1. 河南大学资源与环境研究所,开封 475004
    2. 黄河文明河南省协同创新中心暨河南大学黄河文明与可持续发展研究中心,开封 475001
  • 收稿日期:2017-10-09 修回日期:2018-01-29 出版日期:2018-04-20 发布日期:2018-05-28
  • 作者简介:

    作者简介:刘德新(1989- ),男,河南柘城人,博士研究生,主要从事土壤与沉积物环境变化研究。E-mail: liudexin269@163.com

  • 基金资助:
    国家自然科学基金项目(41171409);教育部人文社会科学重点研究基地重大项目(12JJD790023);教育部和河南省共建河南大学项目(SBGJ090101);河南省高校科技创新团队支持计划(16IRTSTHN012)

Carbon density and storage in flood sediments of the Yellow River during the Mid-Late Holocene in Kaifeng city

Dexin LIU1(), Jianhua MA1,2(), Lei GU1, Yanfang CHEN1, Pengfei WU2, Jing LU1   

  1. 1. Institute of Natural Resources and Environment, Henan University, Kaifeng 475004, Henan, China
    2. Collaborative Innovation Center on Yellow River Civilization of Henan Province & Key Research Institute of Yellow River Civilization and Sustainable Development, Henan University, Kaifeng 475001, Henan, China;
  • Received:2017-10-09 Revised:2018-01-29 Online:2018-04-20 Published:2018-05-28
  • About author:

    Author: Shi Zhenqin (1988-), PhD, specialized in regional development and land space management in mountain areas. E-mail: kevinszq@163.com

    *Corresponding author: Deng Wei (1957-), Professor, specialized in mountain environment and regional development.

    E-mail: dengwei@imde.ac.cn

摘要:

开封古城相对完整的黄泛沉积序列为探索历史时期碳密度及储量提供了难得的研究载体。以开封城区(师专、医专和明伦)和郊区(金明)4个25 m岩芯为研究对象,通过对861个岩芯样品的容重、有机碳和黑碳分析测试,开展地层有机碳和黑碳密度及储量分析。结果表明:地层有机碳和黑碳含量垂直分布特征基本一致,高值主要集中在地表1 m范围内,其次是各朝代文化层附近,城区地层含量明显高于郊区。地层0~25 m黑碳密度均值为24.67 kg/m2,黑碳储量为11.30 Tg,分别占总有机碳密度和储量的24.26%和21.75%。表明地层黑碳碳库在总有机碳库中占有较大比例,在计算土壤或沉积物碳密度和碳储量时,应将黑碳也考虑在内。老城区0~25 m地层黑碳储量占比高出新区10%以上,主要与老城区受历朝人类活动影响强度较大及煤炭的广泛使用有关。研究结果可为寻找“遗失的碳”、精确计算碳循环和平衡提供参考。

关键词: 有机碳, 黑碳, 碳密度, 碳储量, 开封地层

Abstract:

Concerns over global change have fueled interest in the carbon cycle, which has impelled the research on the distribution of various forms of carbon in terrestrial ecosystems, and the estimation of carbon storage amounts in various reservoirs. Black carbon (BC) is an important component of organic carbon (OC), and also an important component of the inert carbon pool involved in the global slow carbon cycle. Palaces of several dynasties were buried in the underground of Kaifeng city by flood sediments of the Yellow River. This has formed the unique spectacle of overlapping cities, which provide excellent and rare samples to study carbon density and storage in the historical period. Four sedimentary cores with a length of 25 m were drilled in April, 2012. Three of them were located in the urban area of Kaifeng city (ZKsz, ZKyz and ZKml), and another one was located at the western suburb of the city (ZKjm). Each core was split into 10 cm intervals mostly, for a total number of 861 sediment samples. Then the density and storage of OC and BC were analyzed based on their respective content determination and bulk density. The results show that OC and BC contents can demonstrate the consistent vertical distribution characteristics, and their high values are mainly concentrated within a range of 0-1 m in depth, followed by the historical cultural layers. The OC and BC contents are both significantly higher in urban strata (ZKsz, ZKyz and ZKml) than those in the suburb (ZKjm) of Kaifeng city. The BC density and storage in the 0-25 m layer are 24.67 kg/m2 and 11.30 Tg, accounting for 24.26% and 21.75% of the total organic carbon (TOC) density and storage, respectively. This indicates that the BC storage of the strata occupies a large proportion of the whole carbon pool, so that it should be taken into account when we calculate carbon density and storage in soils and sediments. Comparison of the storage ratio of BC/TOC respectively in the old urban area and new area of Kaifeng city in 0-25 m layer, show that the former is over 10% higher than that of the latter, mainly due to its stronger influence of human activities and more extensive use of coal. This study can provide a reference for finding "missing carbon" and further studying the cycle and balance of carbon.

Key words: organic carbon, black carbon, carbon density, carbon storage, flood sediments of Kaifeng city