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Open Access

Variation characteristics of CO2 in a newly-excavated soil profile, Chinese Loess Plateau: Excavation-induced ancient soil organic carbon decomposition

Chao Song1,2, Man Liu3, Qiu-yao Dong1,2( ), Lin Zhang1,2, Pan Wang1,2, Hong-yun Chen1,2, Rong Ma4
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
Key Laboratory of Quaternary Chronology and Hydro-Environmental Evolution, China Geological Survey, Shijiazhuang 050061, China
Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
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Abstract

Soils of the Chinese Loess Plateau (CLP) contain substantial amounts of soil inorganic carbon (SIC), as well as recent and ancient soil organic carbon (SOC). With the advent of the Anthropocene, human perturbation, including excavation, has increased soil CO2 emission from the huge loess carbon pool. This study aims to determine the potential of loess CO2 emission induced by excavation. Soil CO2 were continuously monitored for seven years on a newly-excavated profile in the central CLP and the stable C isotope compositions of soil CO2 and SOC were used to identify their sources. The results showed that the soil CO2 concentrations ranged from 830 μL·L−1 to 11190 μL·L−1 with an annually reducing trend after excavation, indicating that the human excavation can induce CO2 production in loess profile. The δ13C of CO2 ranged from –21.27 ‰ to –19.22 ‰ (mean: –20.11‰), with positive deviation from top to bottom. The range of δ13CSOC was –24.0‰ to –21.1‰ with an average of –23.1‰. The δ13C-CO2 in this study has a positive relationship with the reversed CO2 concentration, and it is calculated that 80.22% of the soil CO2 in this profile is from the microbial decomposition of SOC and 19.78% from the degasification during carbonate precipitation. We conclude that the human excavation can significantly enhance the decomposition of the ancient OC in loess during the first two years after perturbation, producing and releasing soil CO2 to atmosphere.

Keywords

Soil organic matterHuman excavationSoil CO2Stable carbon isotopic compositionChina Loess Plateau

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Journal of Groundwater Science and Engineering
Volume 10 Issue 1,
March 2022
Pages 19-32
DOI: 10.19637/j.cnki.2305-7068.2022.01.003
Cite this article:
Song C, Liu M, Dong Q-y, et al. Variation characteristics of CO2 in a newly-excavated soil profile, Chinese Loess Plateau: Excavation-induced ancient soil organic carbon decomposition. Journal of Groundwater Science and Engineering, 2022, 10(1): 19-32. https://doi.org/10.19637/j.cnki.2305-7068.2022.01.003

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Received: 20 March 2021
Accepted: 25 December 2021
Published: 24 March 2022
© 2022 Journal of Groundwater Science and Engineering Editorial Office
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