| 表层岩溶带的岩溶动力学特征及其环境和资源意义 |
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| 关键词:epikarst zone karst dynamics global environmental change |
| 基金项目:地矿部“九五”重大科技项目,国家自然科学基金重点项目 |
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| 摘要: |
| Dynamics Features of the Epikarst Zone and Their Significance in Environments and Resources |
| The epikarst zone is in the convergence zone of atmosphere, lithosphere, biosphere and hydrosphere. It is widespread in South China, but its sizes, landforms and locations are influenced by geological and climatic factors. The tropical and subtropical monsoon climate in South China can create such strong karst dynamic conditions as the mean annual rainfall between 1000 to 2000 mm, high average air temperature 14～21℃,and high soil air CO 2 content from 3000×10 -6 up to 50000×10 -6 ; therefore the carbon-water-calcium cycle is active and rapid. The karst dynamic processes in the epikarst zone are much stronger than the deep karst part, which results in high solution rate and hardness of water. As a result, high CO 2 flux sinks in karst water. The karst dynamic processes in the epikarst zone are sensitive to environmental changes, and hence can provide environmental information in a short time scale.Due to the development of the epikarst zone, the water cycle in karst mountain area can be divided into two parts: shallow water flow in the epikarst zone and conduit flow in the deep karst zone. In addition,the shallow water cycle is very important for water supply in karst mountains where the underground karst water is deep. |
| JIANG Zhong-cheng,YUAN Dao-xian.1999.Dynamics Features of the Epikarst Zone and Their Significance in Environments and Resources[J].Acta Geoscientica Sinica,20(3):302-308. |
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