EFFECTS OF THE ATMOSPHERIC CO2 IN KARST AREA OF SOUTHERN AND LOESS AREA OF NORTHERN CHINA
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摘要: 我国南方岩溶区与北方黄土区都是巨大的碳库。碳酸盐的溶蚀及再结晶是两个碳库与大气CO2交换的重要过程。碳的区域平衡是评价化学风化消耗或逸散CO2的基础。岩溶区与黄土区在地球化学风化的环境背景、溶蚀过程、产物运移和归宿等差异很大。黄土区化学风化消耗大气CO2通量较岩溶区小。目前评价两类地区土壤与大气CO2的源汇关系尚不成熟，需要定量认识土壤CO2与下伏碳酸盐岩溶蚀或与下伏黄土次生碳酸盐化作用。岩溶区湖泊沉积物中有机质分解产生的HCO3-制约外源及内生碳酸盐溶解和自生碳酸盐形成。Abstract: In order to understand the rise trend of the atmospheric CO2, it is necessary to study the relationship of source and sink between CO2 and the geo-mass based on the outline of recent carbon cycle. The karat region in southern China is a giant carbon reservoir, as well as the area of loess cover in northern China. The dissolution and re-crystallizahon of carbonate are important processes in the exchange of atmospheric CO2 with above carbon reservoirs. It is simultaneously that both of carbonate and non-carbonate experience the chemical weathering. For example, only 2 / 3 of aquatic composition comes from calcite and dolomite in the Lake Hongfeng, though its catchment is a typical karat region.
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Key words:
- karst area /
- area of loess covers /
- chemical weathering /
- CO2 forming in the soil /
- fate by deposition
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