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| Spatio-temporal variations of soil organic carbon pools of paddy soil in a typical red soil region from 2009 to 2019 |
| Received:July 23, 2022 |
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| KeyWord:red soil region|active SOC pool|slow SOC pool|resistant SOC pool|spatio-temporal variation|carbon sequestration in paddy soil |
| Author Name | Affiliation | E-mail | | WANG Xiyang | Jiangxi Key Laboratory of Environmental Microbiology, Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Institute of Watershed Ecology, Nanchang 330096, China | | | LI Liang | Jiangxi Key Laboratory of Environmental Microbiology, Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Institute of Watershed Ecology, Nanchang 330096, China | | | LI Xiaohui | Jiangxi Key Laboratory of Environmental Microbiology, Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Institute of Watershed Ecology, Nanchang 330096, China | | | XIN Zaijun | Jiangxi Key Laboratory of Environmental Microbiology, Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Institute of Watershed Ecology, Nanchang 330096, China | | | HE Shifu | Jiangxi Key Laboratory of Environmental Microbiology, Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Institute of Watershed Ecology, Nanchang 330096, China | | | SUN Xiaoyan | Jiangxi Key Laboratory of Environmental Microbiology, Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Institute of Watershed Ecology, Nanchang 330096, China | xiaoyan_sun05@163.com |
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| Abstract: |
| It is important to grasp the spatial and temporal changes of soil organic carbon（SOC）pools in time to take effective measures to enhance agroecosystem carbon sink. In this study, a new round of soil sample collection was carried out based on historical sampling information, and the samples were analyzed based on a method of CO2-C release during a 100-day incubation. The data from incubation experiments were fitted to a three-pool first-order kinetics model to obtain the sizes of active（Ca）, slow（Cs）and resistant（Cr）SOC pool, which would be used to reveal the spatial-temporal changes of Ca, Cs, and Cr in the surface paddy soil in Dongxiang area in Jiangxi Province from 2009 to 2019 and their main influencing factors. The results showed that from 2009 to 2019, the total organic carbon（TOC）, Ca and Cs in the surface paddy soil in Dongxiang area decreased（on average）, while Cr increased（on average）; the change rates of TOC, Ca, Cs, and Cr were -0.04, -0.02, -0.07 g·kg-1·a-1 and 0.05 g·kg-1·a-1, respectively（P>0.05）. Soil properties made a small contribution to the spatial variations of the TOC, Ca and Cr in the surface Dongxiang paddy soils in 2019, however, soil total nitrogen（TN）played a major role in controlling the variation of TOC, Cs and Cr at the same time, thus, the synergistic variation of soil N content should be paid attention to when developing carbon sequestration measures in paddy soil. In addition, in the past 10 years, the variation range of paddy SOC component and its composition in the northern and central regions of the study area was large, while the variation range was small in the southwest and southeast regions of the study area. Therefore, in the future, the spatial and temporal variations of different SOC pools should be highlighted in carbon sequestration in the paddy soils in red soil region. |
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