| 半干旱岩溶区油松林显著促进碳酸盐岩溶蚀 |
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| 关键词:carbonate weathering vegetation type dissolution rate carbon sink semi-arid karst area |
| 基金项目:国家自然科学基金(编号: 31960233);广西重点研发计划项目(编号: 桂科AB19110004);中国地质调查局地质调查项目(编号: 1212011087121);广西重点基金项目(编号: 2018GXNSFDA281036) |
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| 摘要: |
| Pinus tabuliformis Forests in Semi-arid Areas Significantly Enhance Carbonate Rock Dissolution |
| Vegetation increases atmospheric CO2 sequestration by enhancing carbonate rock weathering and plays an important role in carbon neutralization. However, the effects of different vegetation types on carbonate weathering are unclear. To determine these effects, the dissolution rates and their influencing factors in different vegetation alliances were compared in detail using in situ rock tablets tests coupled with systematic vegetation surveys in a typical small karst watershed in a semi-arid area. The results showed that the average dissolution rate of carbonate rocks was in the order of forest > grassland > shrubland at the Vegetation Formation Group level, showing a weakening effect in the early stage of succession and a promoting effect in the later stage. At a finer vegetation classification level, the dissolution rate of the Pinus tabuliformis Forest Alliance was much higher than that of other alliances, which was five times to approximately thirty times that of other alliances, and the effect intensity of different alliances on dissolution rate could be identified and sorted. The dissolution rate had no correlation with any single factor in soil CO2 concentration (pCO2), soil water content, and soil temperature but had a corresponding relationship with the synchronization of the three factors, which differed notably from that in humid areas. Vegetation succession enabled more effective regulation of key dissolution factor matching, resulting in higher weathering rate. Pinus tabuliformis forest in semi-arid areas could significantly enhance carbonate weathering. Extensive comparative research at the Alliance level is strongly suggested to illuminate the relationship between vegetation types and carbonate weathering and provide effective guidance for increasing carbon sinks in karst ecosystem restoration. |
| HOU Man-fu,QIN Xiao-qun,HUANG Qi-bo,DENG Yan,LIU Peng-yu.2022.Pinus tabuliformis Forests in Semi-arid Areas Significantly Enhance Carbonate Rock Dissolution[J].Acta Geoscientica Sinica,43(4):472-482. |
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