| 近27a来典型白云岩流域岩溶碳汇变化及其调控机制——以贵州施秉黄洲河流域为例 |
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| 引用本文： | 邰治钦,曾成,肖时珍,肖华,代林玉,闫伟.近27a来典型白云岩流域岩溶碳汇变化及其调控机制——以贵州施秉黄洲河流域为例[J].中国岩溶,2021,40(4):625-635. |
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| 作者姓名： | 邰治钦 曾成 肖时珍 肖华 代林玉 闫伟 |
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| 作者单位： | 1.贵州师范大学喀斯特研究院/国家喀斯特石漠化防治工程技术研究中心/中国科学院地球化学研究所环境地球化学国家重点实验室 |
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| 基金项目： | 国家自然科学基金“施秉典型白云岩流域的岩溶碳汇通量及其土地利用控制”(41673129)；国家重点研发计划项目子课题“喀斯特石漠化防治与世界遗产保护及山地旅游产业技术与示范”[2016YFC0502606-01]；贵州师范大学资助博士科研项目“贵州施秉白云岩喀斯特石漠化地区土壤侵蚀机理研究”(GZNUD[2017]12号) |
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| 摘 要： | 以贵州省施秉县黄洲河典型白云岩岩溶小流域为例，基于白云石化学平衡热力学方法分别定量估算出1990-1992年、2001-2003年及2016-2018年白云岩流域的年均岩溶碳汇强度，并分析其对气候变化、土地利用调控的响应，结果表明:（1）流域内第二个时段年均有效降雨最大，其次是第一个时段，第三个时段的最小；（2）流域内主要以有林地为主，旱地、建设用地持续增加但增长速率减缓，总体上流域植被覆盖度呈现上升趋势；（3）流域整体的岩溶碳汇强度由大到小依次为2002年、1990年、2016年，水田与旱地对岩溶碳汇贡献较大；（4）气候变化与土地利用共同控制岩溶碳汇，碳汇强度可能不随地类正向演替而增大。
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| 关 键 词： | 白云岩流域 化学平衡热力学模型 岩溶碳汇 气候变化 土地利用 |
Variation and rgulation mechanism of karst carbon sink in typical dolomite basin in recent 27 years:A case study of the Huangzhouhe basin in Shibing,Guizhou |
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| TAI Zhiqin,ZENG Cheng,XIAO Shizhen,XIAO Hu,DAI Linyu,YAN Wei.Variation and rgulation mechanism of karst carbon sink in typical dolomite basin in recent 27 years:A case study of the Huangzhouhe basin in Shibing,Guizhou[J].Carsologica Sinica,2021,40(4):625-635. |
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| Authors: | TAI Zhiqin ZENG Cheng XIAO Shizhen XIAO Hu DAI Linyu YAN Wei |
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| Institution: | 1.School of Karst Science， Guizhou Normal University / State Engineering Technology Institute for Karst Desertification Control/State Key Laboratory of Environmental Geochemistry， Institute of Geochemistry， CAS2.State Key Laboratory of Environmental Geochemistry， Institute of Geochemistry， CAS3.School of Karst Science， Guizhou Normal University / State Engineering Technology Institute for Karst Desertification Control |
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| Abstract: | The response mechanism of karst carbon sink to climate change and land use patterns remains controversial. Dolomites with higher solubility than limestone may have higher karst carbon sink potential. However， most previous studies tend to calculate the karst carbon sink value of limestone and ignore the contribution of dolomite to karst carbon sink. Therefore， this paper selects the Huangzhouhe dolomite basin in Shibing county， Guizhou Province as the research object which has developed a typical dolomite karst landform and has become a world natural heritage protected area. We quantitatively estimate the annual average karst carbon sink strength of the dolomite basin in 1990-1992， 2001-2003 and 2016-2018 by using the dolomite chemical equilibrium thermodynamic method derived from the dolomite dissolution equilibrium equation， with a view to estimating the dolomite karst carbon sink value and its response mechanism to the joint effect of climate change and land use. The results show that，（1） The average annual rainfall in the basin decreases with time， but the effective rainfall in the second period is the largest due to the difference in evapotranspiration， followed by the first period， and the effective rainfall in the third period is the smallest；（2）The basin is mainly forested land. With the gradual increase of human activities， paddy fields， dry land， and construction land continue to increase， but the growth rate of the latter two types of land has slowed down， and due to the environmental regulations of the World Natural Heritage Site， the overall vegetation coverage of the basin shows a trend of restoration；（3）The overall karst carbon sink intensity in the basin at different periods of time is the second period， the first period， and the third period， and the corresponding karst carbon sink values are 31.68， 33.40，27.93 t CO2·km-2·a-1，respectively. Among different types of land use， although the carbon dioxide partial pressure of natural land is higher than that of land used for human activities，natural forest land with higher vegetation coverage causes greater water loss，making dry land and paddy fields affected by human activities significantly higher.The karst carbon sink value reached 31.97-32.64 t CO2·km-2·a-1， while the karst carbon sink value of forest land and shrubland was relatively small， only 28.64-30.48 t CO2·km-2·a-1.According to the above analysis， we believe that climate change and land use jointly act on karst carbon sink， and the rainfall runoff effect dominated by climate change obviously masks the carbon dioxide effect， and the intensity of karst carbon sink may not increase with the positive succession of land use. Moreover， by comparing the calculation results of karst carbon sink in limestone basins under the same climatic conditions， although different calculation methods and basin areas will lead to certain differences in karst carbon sink values， dolomite karst carbon sink still have a large karst carbon sink potential. Therefore， in the calculation of global terrestrial karst carbon sink， the role of global dolomite karst carbon sink should be taken seriously. |
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