| 表层岩溶系统碳迁移路径及其土被效应探讨 |
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| 引用本文： | 康志强,何师意.表层岩溶系统碳迁移路径及其土被效应探讨[J].中国岩溶,2011,30(4):456-460. |
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| 作者姓名： | 康志强 何师意 |
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| 作者单位： | 1. 广西地质勘查总院,广西南宁530023;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,广西桂林541004
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,广西桂林,541004 |
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| 基金项目： | 中国地调局工作项目(1212371011028) |
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| 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.
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| 关 键 词： | 岩溶碳汇 CO2分压 表层岩溶系统 贵州板寨地下河流域 |
| 收稿时间： | 2011/9/14 0:00:00 |
The regolith effect on carbon transfer path in epi-karst system |
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| KANG Zhi-qiang and He Shi-yi.The regolith effect on carbon transfer path in epi-karst system[J].Carsologica Sinica,2011,30(4):456-460. |
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| Authors: | KANG Zhi-qiang and He Shi-yi |
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| Institution: | 2 ( 1. Guangzi Central Institute of Geology and Exploration, Nanning, Guangaci 530023, China 2. Key Laboratory of Karst Dynamics, MLR ＆ GZAR/ International Research Centre on Karst UNESCO, Guilin, Guangxi 541004, China) |
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| 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 HCO-3 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. |
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| Keywords: | carbon sink CO2 partial pressure epi-karst system the Banzhai Subterranean River Cacthment in Guizhou |
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