Mechanism of carbon cycle and source-sink conversion and quantitative carbon exchange model in critical zone of wetland

doi:10.13745/j.esf.sf.2024.6.36

Abstract

Abstract:

The transformation mechanism and quantitative relationship between carbon source and sink conversion in critical zone of wetland are key scientific issues that need to be explored and addressed in the study of wetland carbon cycle. Carbon (C) is one of the main elements that constitute living organisms and plays an extremely important role in the material cycle and energy flow processes of ecosystems. As the most active part of the Earth’s critical zone, the critical zone of wetland contains a large amount of information interchange. It is necessary to study the mutual feedback mechanism of carbon cycle and its migration and transformation information through information extraction and interpretation. Carbon has the function of a “source” and “sink” in wetland ecosystems, which involves the effects of atmosphere, soil, vegetation, water and microorganisms. Carbon cycle in critical zone of wetland plays a crucial role in promoting wetland ecological environment protection. Based on the biogeochemical cycle characteristics of C in critical zone of wetland, this paper analyzed the occurrence patterns and the migration and transformation processes of C at vegetation, atmosphere, root, soil interfaces. The main control factors of migration and transformation and coupling mechanisms affecting carbon cycle were also explained in critical zone of wetland. Further exploration was conducted on the positive role of dual driving forces of “carbon reduction source” and “carbon increase sink” in achieving the goal of “carbon peak” and “carbon neutrality”. Finally, the future research directions were proposed, which should focus on strengthening the comprehensive analysis of the spatiotemporal evolution of C and the impact mechanism of biogeochemistry cycle in critical zone of wetland, constructing a quantitative carbon cycle model, accurately measuring the flux changes during the transformation process of “carbon source” and “carbon sink” to quantify the surplus of “carbon sink” in critical zone of wetland and evaluating its contribution to “carbon peak” and “carbon neutrality”.

Key words: critical zone of wetland, carbon cycle, carbon neutrality, evolution mechanism, quantitative mode

CLC Number:

X142
Q148

ZHOU Nianqing, GUO Mengshen, CAI Yi, LU Shuaishuai, LIU Xiaoqun, ZHAO Wengang. Mechanism of carbon cycle and source-sink conversion and quantitative carbon exchange model in critical zone of wetland[J]. Earth Science Frontiers, 2024, 31(6): 436-449.

Figures/Tables 7

Fig.1 Schematic diagram of the structure and process response of Critical Zone of the Earth. Fig.a adapted from [23].

Fig.2 Presence of carbon under different conditions in critical zone of wetland

Fig.3 Schematic diagram of carbon cycle at different interfaces in critical zone of wetland. Modified after [54].

Fig.4 Schematic diagram of carbon emission, carbon peak and carbon neutrality

Fig.5 Technical roadmap under the goal of “Carbon Peak and Carbon Neutrality”

Fig.6 Carbon cycle process diagram in nature and critical zone of wetland

Fig.7 Carbon cycle quantitative process of profit and loss in critical zone of wetland

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