| 西江流域化学风化过程及其CO2消耗通量 |
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| 关键词:strontium isotopes Galy model carbonate rocks chemical weathering Xijiang |
| 基金项目:广西重点研发专项(编号: 2021AB28002);国家自然科学基金项目(编号: 42177075);中国地质调查局地质调查项目(编号: DD20190452);中国地质科学院岩溶地质研究所基本科研费(编号: 2020004) |
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| Chemical Weathering Process and Its CO2 Consumption Flux in the Xijiang River Basin |
| To evaluate the process of terrestrial weathering and river material cycling in south China, the main ions, strontium (Sr) content, and Sr isotopic ratio of river water were measured in the main streams and tributaries of Xijiang River during wet and dry periods. By combining the Galy model, the chemical weathering characteristics and CO2 consumption flux of Xijiang River basin were calculated. The results show that: (1) Chemical weathering in the Xijiang River Basin is less influenced by anthropogenic activities and mainly controlled by carbonic acid. (2) The main sources of cations in river water are silicate and carbonate. The molar proportion of cation materials in silicate during the high and low water periods remains at 0.04. Meanwhile, the respective molar proportions of limestones in carbonate are 0.79 and 0.78, while those of dolomites are 0.17 and 0.18. (3) The chemical weathering process of the Xijiang River Basin shows discrepancy during the high and low water periods. The participation of sulfuric acid in dolomite weathering impacts the CO2 flux during the carbonate weathering process, causing the CO2 flux to be different in each chemical weathering process. (4) The CO2 fluxes of the chemical weathering process between carbonate and carbonic acid are (0.78~244.25)×106 and (0.10~49.16)×106 mol/km2/yr during the high and low water periods, respectively. The respective CO2 fluxes between carbonate and sulfur acid are (0.25~42.16)×106 and (0.01~13.90)×106 mol/km2/yr, and those between silicate and carbonic acid are (0.05~17.83) ×106 and (0.02~6.07)×106 mol/km2/yr. |
| ZHANG Yong,WU Fu,LIU Zhen-yu,YU Shi,ZHANG Wan-jun,HUANG Gui-qiang,YUE Zhi-sheng,ZHAI Guo-jun.2022.Chemical Weathering Process and Its CO2 Consumption Flux in the Xijiang River Basin[J].Acta Geoscientica Sinica,43(4):425-437. |
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