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[1]Wang Wenqian,Song Yuan,Zhang Hui,et al.Experimental Study on the Effective Depth for Different Erodible Loess Particles to Inhibit CO2 Emissions[J].Research of Soil and Water Conservation,2024,31(06):119-129.[doi:10.13869/j.cnki.rswc.2024.06.038]

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Experimental Study on the Effective Depth for Different Erodible Loess Particles to Inhibit CO₂ Emissions

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 06 Page number: 119-129 Column: Public date: 2024-12-10

Title:: Experimental Study on the Effective Depth for Different Erodible Loess Particles to Inhibit CO₂ Emissions

Author(s):: Wang Wenqian^1,2,3, Song Yuan⁴, Zhang Hui^1,2,3, Guo Shengli^1,2,3,4, Li XianWen⁵, Hu Yaxian^1,2,3,4*; (1.Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling, Shaanxi 712100, China; 2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; 3.University of Chinese Academy of Sciences, Beijing, Shaanxi 100049, China; 4.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 5.College...)

Keywords:: loess; sediment; carbon sink; particle size; CO₂; gas transport; ¹³C tracing

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.06.038

Abstract:: [Objective]The aims of this study are to examine the effects of sediment grain size and thickness on the CO₂ transport process in the profile, to clarify the effective deposition thickness of different grain sizes of eroded loess to inhibit CO₂emission under different water content conditions, and to provide a theoretical basis for improving the process of organic carbon mineralization and emission in the sedimentary area. [Methods]By settling fractionation, the loess particles of four different size classes(≥250 μm, 250～125 μm, 125～63 μm, and≤63 μm)were settled freely through a static water column to form thin soil columns with different thicknesses(0.4 cm, 0.7 cm, 1.4 cm, and 2 cm). Each sediment column was maintained at field water holding capacity, subjected to constant moisture mineralization, and subsequently amended with ¹³C-labeled glucose to serve as an independent CO₂source. The released ¹³C-labeled CO₂was traced, and the relative abundance of ¹³C was analyzed during three stages: constant moisture mineralization, ¹³C-labeled CO₂ tracing, and natural desiccation. [Results](1)The average CO₂emission rate during constant moisture mineralization(without ¹³C-labeled CO₂)was 0.21 μg/(cm²·h), slightly lower than the 0.35 μg/(cm²·h)during ¹³C-labeled CO₂ tracing, both significantly lower than the 0.9 μg/(cm²·h)during natural desiccation. This indicated that loess sediment layers exhibited varying degrees of inhibitory effects on CO₂ emissions under moist conditions. However, upon soil desiccation, CO₂ previously sequestered within the soil layer was concentrated and released, weakening the sediment carbon sink effect.(2)The average CO₂emission rates for coarse particles(D≥250 μm)were 77.9%, 39.6%, and 30.8% higher than for fine particles(D<63 μm)in the three cultivation stages, respectively. Coarse particles exhibited more pronounced differences in CO₂ emission rates and ¹³C relative abundance compared to fine particles, and this effect was observed one day earlier.(3)Under moist conditions, a sediment thickness of at least 2 cm was required to effectively inhibit CO₂transport for particles with diameters≥125 μm. In contrast, sediment thicknesses of only 1.4 cm or even thinner were effective for particles with diameters 63≤D<125 μm and D<63 μm in suppressing CO₂ diffusion to the surface soil. [Conclusion]This study elucidates the effective sediment depths for inhibiting CO₂ transport and emissions in different particle size fractions of loess, and provides the quantitative data for understanding sediment carbon sink effects and mechanisms.

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Last Update: 2024-12-10