| 漓江流域丰水期外源酸对岩溶化学风化碳汇的影响 |
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| 关键词:karst carbon sink water chemistry rock chemical weathering allogenic acids |
| 基金项目:国家自然科学基金项目(编号: 42177075);广西重点研发专项(编号: 2021AB28002);中国地质调查局地质调查项目(编号: DD20190452) |
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| Effect of Exogenous Acids on the Karst Chemical Weathering and Carbon Sink in Lijiang River during the Wet Season |
| To analyze and evaluate the chemical characteristics of water and the influence of allogenic acids on the karst carbon sink of Lijiang River, the main stream sections and tributaries at the catchment were sampled and monitored by combining the Gibbs diagram, ion ratio, Galy model, and isotope characteristic values in April 2020. The results showed that (1) controlled by weathering of carbonate, the hydrochemistry of Lijiang River included HCO3-Ca, and the average equivalence ratio of [Ca2++Mg2+]/[HCO– 3] and [Ca2++Mg2+]/[HCO– 3+SO2– 4+NO– 3] were 0.87, 1.07, respectively. This indicates that the weathering process of carbonate is influenced by the allogenic sulfuric and nitric acid. (2) The carbon sink flux at the final outlet (Yangshuo section) of Lijiang River is 974.86×103 mol·(km2·a)–1. The proportion of carbon fluxes in the total exports fluctuated greatly between different tributaries, with Xiaorong River and Liangfeng River accounting for 1.44% and 35.74%, respectively. The Gantang River and Liangfeng River accounted for 57.04%. (3) The average proportion of CO2 consumption in the tributaries within the basin is 10.02% with significant differences in spatial variation, and is obviously influenced by geological distribution and flow rate of different basins. (4) The DIC contribution rate of chemical weathering process between carbonate and allogenic acid ranged from 13% to 55%. In terms of spatial variation, the DIC contribution rate of Darong River and Taohua River was higher than 50%, whereas the DIC contribution rate of allogenic acid is lower than 13% in the Yangshuo section. |
| DU Wen-yue,WANG Qi,PU Jun-bing,YU Shi.2022.Effect of Exogenous Acids on the Karst Chemical Weathering and Carbon Sink in Lijiang River during the Wet Season[J].Acta Geoscientica Sinica,43(4):449-460. |
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