表层岩溶系统碳迁移路径及其土被效应探讨

康志强; 何师意

doi:10.3969/j.issn.1001-4810.2011.04.017

表层岩溶系统碳迁移路径及其土被效应探讨

doi: 10.3969/j.issn.1001-4810.2011.04.017

康志强¹,
何师意²

1.
广西地质勘查总院；国土资源部、广西壮族自治区岩溶动力学重点实验室/联合国教科文组织国际岩溶研究中心
2.
国土资源部、广西壮族自治区岩溶动力学重点实验室/联合国教科文组织国际岩溶研究中心

基金项目: 中国地调局工作项目(1212371011028)

计量
- 文章访问数: 2324
- HTML浏览量: 410
- PDF下载量: 1240
- 被引次数: 0
出版历程
- 收稿日期: 2011-09-14
- 发布日期: 2011-12-25

The regolith effect on carbon transfer path in epi-karst system

KANG Zhi-qiang¹,
He Shi-yi²

1.
Guangxi Central Institute of Geology and Exploration；Key Laboratory of Karst Dynamics, MLR & GZAR / International Research Centre on Karst, UNESCO
2.
Key Laboratory of Karst Dynamics, MLR & GZAR / International Research Centre on Karst, UNESCO

摘要

摘要: 为了弄清楚表层岩溶系统碳汇机理,有必要对该系统中气、液和固三相不平衡体系中碳的迁移途径进行研究。2010年,在板寨地下河流域布置了8个碳稳定同位素分析测试点。通过碳稳定同位素示踪剂及空气CO2分压对比,发现森林区岩溶水和自由大气中大部分碳是来自土壤空气。在表层岩溶系统碳汇过程中整个碳迁移路径可分为4个环节,依次为(1)植被光合作用吸收空气CO2;(2)土壤根系的呼吸作用及腐殖质分解向土壤释放CO2;(3)地下水循环岩溶作用将气态CO2转换成液态HCO3-离子;(4)地下水中的碳随水流向河流及海洋。在整个碳汇过程中,森林和土壤起到了“加压泵”的作用,大大提高了大气CO2向土壤空气CO2转换过程中的CO2分压,从而显著地提高了岩溶的作用速率。
- 岩溶碳汇 /
- CO2分压 /
- 表层岩溶系统 /
- 贵州板寨地下河流域
Abstract: In order to understand the mechanism of karst carbon sink, it is necessary to get clear the carbon transfer path among the materials in the three phases of air, solid carbonate rocks and liquid karst groundwater in epi-karst system. There are 8 carbon stable isotope sample sites, including 5 groundwater sites and 3 gaseous CO2 sites in the Banzhai Undergroung River Catchment. Based on the analysis to carbon stable isotope and CO2 partial pressure data, it is found that the carbon in free air and karst water mostly come from the soil air. The carbon transfer path in epi-karst system can be divided into 4 steps: (1) the photosynthesis of vegetation taking CO2 from free air; (2) release of CO2 to the soil layer by way of the respiration of plant roots and decomposition of humus; (3) the gaseous CO2 being transferred to liquid HCO3- ion by karst process during the water cycle; (4) the bicarbonate in groundwater moving to river or ocean with the groundwater flow. The forest and soil takes a “booster pump” action to increase the soil CO2 partial pressure from free air and raise the rate of karst process remarkably, it also plays a very important roles in karst process carbon sink.
- carbon sink /
- CO2 partial pressure /
- epi-karst system /
- the Banzhai Subterranean River Cacthment in Guizhou

HTML

参考文献(15)

[1]	King D A. ENVIRONMENT: Climate Change Science: Adapt, Mitigate, or Ignore?［J］. Science, 2004,303(5655): 176-177.
[2]	Shiklomanov I A. World fresh water resources［M］//GLEICK P H. Water in Crisis: A Guide to the World's Freshwater resources. New York; Oxford University Press. 1993: 13-24.
[3]	Liu Z, Dreybrodt W, Wang H. A new direction in effective accounting for the atmospheric CO2 budget: Considering the combined action of carbonate dissolution, the global water cycle and photosynthetic uptake of DIC by aquatic organisms［J］. Earth Science Reviews, 2010,99(3-4): 162-172.
[4]	Blum J, Gazis C, Jacobson A, et al. Carbonate versus silicate weathering in the Raikhot watershed within the High Himalayan Crystalline Series［J］. Geology, 1998,26(5): 411-414.
[5]	Gombert P. Role of karstic dissolution in global carbon cycle［J］. Global and Planetary Change, 2002,33(1-2): 177-184.
[6]	Jiang Z, Yuan D. CO2 source-sink in karst processes in karst areas of China［J］. Episodes, 1999,22(1): 33-35.
[7]	Clark I D, Fritz P. Environmental Isotopes in Hydrogeology［M］. New York: Taylor & Francis LLC, 1997.
[8]	Han G, Tang Y, Wu Q. Hydrogeochemistry and dissolved inorganic carbon isotopic composition on karst groundwater in Maolan, southwest China［J］. Environmental Earth Sciences, 2010,60(4): 893-899.
[9]	郑永飞,陈江峰.稳定同位素地球化学［M］.北京:科学出版社,2000.
[10]	张志卫,闫志为,曾成,等.茂兰自然保护区板寨地下河系统的水文地质特征［J］.地下水,2009,31(2):11-13,32.
[11]	杨晶,黄建辉,詹学明,等.农牧交错区不同植物群落土壤呼吸的日动态观测与测定方法比较［J］.植物生态学报,2004,28(3):318-325.
[12]	Mook WG. 13C in atmospheric CO2［J］. Netherlands Journal of Sea Research, 1986,20(2-3): 211-223.
[13]	Goldscheider N, Drew D. Methods in Karst Hydrogeology［M］. New York: Taylor & Francis, 2007.
[14]	Deines P, Langmuir D, Harmon R S. Stable carbon isotope ratios and the existence of a gas phase in the evolution of carbonate ground waters［J］. Geochimica et Cosmochimica Acta, 1974,38(7): 1147-1164.
[15]	傅献彩,沈文霞,姚天扬,等.物理化学.上册.［M］.北京:高等教育出版社,2005.