| 基于碳酸盐岩风化的碳源分析及土壤的影响作用机制 |
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| 引用本文： | 朱明秋,曹建华,郭芳.基于碳酸盐岩风化的碳源分析及土壤的影响作用机制[J].中国岩溶,2007,26(3):202-206. |
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| 作者姓名： | 朱明秋 曹建华 郭芳 |
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| 作者单位： | 中国地质科学院岩溶地质研究所,广西,桂林,541004 |
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| 基金项目： | 国家自然科学基金;广西科技厅科研项目 |
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| 摘 要： | 在CO2-H2O-岩石系统中由于碳酸盐岩的可溶性,使其回收土壤/大气CO2的通量比硅酸盐岩更大。通过大陆河流湖泊HCO3-来源和海洋碳来源两种计算方式得出,碳酸盐岩溶解回收大气CO2的量是其它岩类的3倍以上。与同纬度地带性土壤相比,岩溶地区土壤通过促进土下碳酸盐岩的溶解与固碳作用对大气CO2产生更为强烈的汇效应:土壤的覆盖使土下碳酸盐岩的溶蚀速率平均提高4.35倍,从而加快了对土壤/大气CO2的回收速率;富钙的土壤地球化学背景使石灰土富含胡敏酸钙,胡敏酸在土壤中的存留时间长达780~3 000年,是其它类型土壤有机质如富里酸的4~5倍,稳定的胡敏酸钙使土壤有机碳稳定性增加、周转周期延长而得以累积,固碳作用将减少土壤CO2向大气的排放。石灰土的平均有机质含量比同纬度红壤、黄壤分别提高了44%、33%,固碳作用十分明显。
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| 关 键 词： | 岩溶地区 碳酸盐岩溶解 碳转移 土壤固碳作用 |
| 文章编号： | 1001-4810（2007）03-0202-05 |
| 收稿时间： | 2007-05-20 |
| 修稿时间： | 2007年5月20日 |
Analysis on the corbon amounts originated by the weatheringof carbonate rocks and the influence of soils on the carbon turnover process in karst areas |
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| ZHU Ming-qiu,CAO Jian-hua and GUO Fang.Analysis on the corbon amounts originated by the weatheringof carbonate rocks and the influence of soils on the carbon turnover process in karst areas[J].Carsologica Sinica,2007,26(3):202-206. |
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| Authors: | ZHU Ming-qiu CAO Jian-hua and GUO Fang |
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| Institution: | Instituteo f Karst Geology, CAGS , Guilin , Guang xi 541004, China |
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| Abstract: | Carbonate rock in CO2-H2O-rock system can uptake more CO2 from soil or air than silicate rock due to dissolubility of the carbonate rock. The result calculated by using the HCO3^- sources of continental rivers and lakes and carbon sources of the ocean indicates that the flux of CO2 reclaimed by carbonate dissolution is 3 times more than other rocks. Compared with the zonal soil of the same latitude, soil in karst area is of stronger carbon sink effect, for it can accelerate dissolution of carbonate rock and its ability of fixing carbon. The soil leads to denudation rate of carbonate rock increasing by 4. 35 times, which accelerates the rate of uptake of CO2 from soil and air. On the other hand, the soil has rich organic carbon in the form of humic calcium which is firmly fixed in the soil because of the inertia of the humic calcium. Humic acid is accumulated in the soil for it could be easily combined with calcium that is abundant in karst area. The average content of soil organic matter in karst area is higher than the zonal soil of the same latitude by 44% and 33%, which leads to obvious effect for carbon fixation. |
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| Keywords: | karst area dissolution of carbonate rock carbon translation fixing carbon by soil |
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