| 流域尺度岩溶碳循环过程——“岩溶作用与碳中和”专栏特邀主编寄语 |
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| 关键词:karst process carbon cycle carbon neutralization watershed scale |
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| Karst Carbon Cycle Process at Watershed Scale:Guest Editor’s Preface to “Karst Process and Carbon Neutralization” |
| At the general debate of the 75th Session of the United Nations General Assembly on September 22, 2020, President XI Jin-ping announced that China would scale up its Nationally Determined Contributions by adopting more vigorous policies and measures, strive to peak CO2 emissions before 2030, and achieve carbon neutrality before 2060. China is taking pragmatic actions to meet these goals. China's carbon peaking and carbon neutralization strategy is a major demand for the Global Climate Governance, which seeks to protecting Earth and foster a shared global community future. China’s efforts also address the countries’ internal demands for high-quality development, an ecologically-centered nation, and comprehensive management of the ecological environment. The carbon neutralization strategy involves in-depth transformation of social and economic development, with a view to achieve low- or even zero-carbon emissions and increase foreign exchange based on technological change. It is a major opportunity for sustainable development.
Carbonate rock is the material basis of karst development. This rock has recorded the environmental changes on the planet and is the largest carbon pool on Earth. Carbonate rock is important in the evolution of Earth’s atmosphere and life. The karst area of Earth is ~ 22 million km2, accounting for 15% of the land area. In China, the karst area of 3.44 million km2 accounts for 15.6% of the planet’s total karst area. The karst carbon cycle is active due to interactions between water, CO2, carbonate weathering, and biological pump. The karst carbon sink constitutes up to 0.824 Pg C/a, amounting for 29.4% of the terrestrial CO2 sink. In view of the important role and impact of karst process on the global carbon cycle, two documents published in China in 2021 proposed to consolidate and enhance the capacity of the karst carbon sink. “Working Guidance for Carbon Dioxide Peaking and Carbon Neutrality in Full and Faithful Implementation of the New Development Philosophy” was jointly released by the Communist Party of China Central Committee and the State Council. “Action Plan for Carbon Dioxide Peaking Before 2030” was released by the State Council. However, the watershed scale effect and stability mechanism of karst carbon sink are not very clear, which creates uncertainty in studies of the karst carbon sink. To clarify the relationship between the neutralization effect of karst and the stability of karst carbon sink and help achieve the goal of carbon peak and carbon neutralization, Acta Geoscientica Sinica has organized the special column “Karst process and carbon neutralization”. |
| LI Qiang.2022.Karst Carbon Cycle Process at Watershed Scale:Guest Editor’s Preface to “Karst Process and Carbon Neutralization”[J].Acta Geoscientica Sinica,43(4):421-424. |
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