亚热带典型岩溶水系统的碳汇效应对比研究

郭芳; 姜光辉; 康志强

doi:10.3969/j.issn.1001-4810.2011.04.009

亚热带典型岩溶水系统的碳汇效应对比研究

doi: 10.3969/j.issn.1001-4810.2011.04.009

1.
中国地质科学院岩溶地质研究所/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.
广西地质勘查总院

基金项目: 国家自然科学基金青年基金(41102161)、桂江流域碳酸盐岩风化速率计算模型(岩[2011]地调01-01-23)、国土资源部行业专项(200911004-1)

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出版历程
- 收稿日期: 2011-11-01
- 发布日期: 2011-12-25

Study on carbon sink effect in typical sub-tropical karst water system

1.
Institute of Karst Geology, CAGS / Karst Dynamics Laboratory, MLR & GZAR / The International Research Center on Karst under the Auspices of UNESCO
2.
Institute of Guangxi Geological Exploration

摘要

摘要: 选择中国南方亚热带地区具有不同地质背景和生态状况的广西柳州市官村地下河(灌木林生态环境、人类活动影响显著)、云南省广南县木美地下河(石漠化严重)和贵州茂兰板寨地下河(原始森林生态)3个岩溶水系统为例,对比研究岩溶水中溶解无机碳浓度和碳汇效应的差异。结果表现,(1)流域管道水的溶解无机碳平均浓度排列顺序为:官村>木美>板寨,表层岩溶带泉水的排列顺序为:木美>官村>板寨。(2)水的PCO2分压计算结果显示:3个流域岩溶水的方解石溶解度基本达到饱和,PCO2的大小顺序为:官村地下河>木美地下河>板寨地下河。(3)根据一个水文年的流量监测计算官村地下河流域的岩溶碳汇强度为12.34tC/(km2?a),板寨地下河流域的为11.8tC/(km2?a),木美地下河流域为34.11tC/(km2?a)。木美地下河流域的石漠化现状相当严重,石漠化面积高达90%,而板寨地下河为原始森林区,但木美地下河流域的岩溶碳汇强度却最大,这与其流域面积大、调蓄功能强,且有外源水补给有关。这也同时表明,单从生态环境的角度去研究岩溶作用碳汇潜力是不够的。
- 岩溶水化学 /
- 生态环境 /
- 石漠化 /
- 碳汇
Abstract: Three karst water systems in South China with different geological conditions and eco-environment are selected to study the differences of the dissolved inorganic carbon and carbon sink effect. These karst water systems include Guancun underground river system in shrubbery and distinct human impact area, Mumei underground river in rock desert and Banzhai underground river in primeval forest. The results of the study prove that: (1) concentration of dissolved inorganic carbon in different locations and seasons is the highest in Guancun, Mumei the second and Banzhai the lowest; (2) the PCO2 pressure in those three studied underground river waters tend to be saturated, with Mumei the biggest, Guancun the second and Banzhai smallest; (3) the quantity of karst carbon sink in Guancun, Banzhai and Mumei is 12.34 tC/(km2.a), 11.8 tC/(km2.a) and 34.11 tC/(km2.a) respectively. Rock desertification area covered 90% of the total area in Mumei, showing a serious ecosystem environment, while Banzhai is primeval forest. Large drainage area, strong regulation and storage capacity and allogenic water contribute to high carbon sink in Mumei underground river system. Therefore the potential carbon sink in karst water systems can not be explained only in view of eco-environment.
- hydrochemistry of karst water /
- eco-environment /
- rock desertification /
- carbon sink

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