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[1]ZHANG Xiaozhen,SONG Yuan,HU Yaxian.Simulation of Organic Carbon Mineralization in Black Soil Layers with Different Particle Size Structures[J].Research of Soil and Water Conservation,2023,30(02):74-80.[doi:10.13869/j.cnki.rswc.2023.02.055]

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Simulation of Organic Carbon Mineralization in Black Soil Layers with Different Particle Size Structures

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 74-80 Column: Public date: 2023-03-10

Title:: Simulation of Organic Carbon Mineralization in Black Soil Layers with Different Particle Size Structures

Author(s):: ZHANG Xiaozhen^1,2, SONG Yuan³, HU Yaxian^1,2,3; (1.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: black soil; soil layer structure; porosity; SOC mineralization; freeze-thaw

CLC:: S152.4

DOI:: 10.13869/j.cnki.rswc.2023.02.055

Abstract:: On the rolling slopes in northeast China, erosion and deposition often result in distinct soil layer structures at different soil slope positions where frequent freeze-thaw cycles can further alter soil water and porosity distribution. However, how different soil layer structures with distinct porosity and connectivity respond to varying water and temperature changes, and how they affect soil organic carbon mineralization and CO₂ emissions are far from being fully understood. The Mollisol samles were collected from the farmlands with gentle and extended slopes in the northeastern China, air-dried and then sieved. Soil particles of two sizes, coarse(0.5～1 mm)and fine(<0.125 mm), were refilled into different soil columns to simulate four typical slope soil structures: all coarse structure all fine structure, upper coarse + lower fine structure, and upper fine + lower coarse structure. The soil columns were incubated and their CO₂ emission rates were measured at different temperature gradients to compare the different responses of the four soil structures to non-freeze-thaw and freeze-thaw conditions. The results show that under non-freeze-thaw conditions(over 5～30℃), CO₂ emission rates among the four soil structures differed significantly, the average CO₂ emission rate of the upper coarse + lower fine soil layers was 14.45 μg/(kg·h)which was 20%～59% higher than those of the other three soil structures, illustrating that the CO₂ transfer efficiency was profoundly influenced by soil particle size and their overlaying patterns; after two freezing-thawing cycles, the differences of CO₂ emission rates among the four soil structures became insignificant over 0～15℃, the average CO₂ emission rate of upper coarse + lower fine soil column was 4.17 μg/(kg·h)which was merely slightly higher than those of the other three soil structures implying that freeze-thaw could change the structure and connectivity of soil pores, thereby weakening the differences of soil layer structure on CO₂ emissions. These findings highlight the potential impacts of soil structure, especially the overlaying patterns and pore connectivity, onto CO₂ emissions, which can help advance the current understanding on carbon source potentials in erosion-deposition settings.

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Last Update: 2023-03-10