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| Spatial-temporal variation and influencing factors of soil organic carbon in arable soils of Lianyungang |
| Received:October 24, 2023 |
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| KeyWord:organic carbon;cultivated land;soil type;land type;human activity |
| Author Name | Affiliation | | GOU Fugang | Geological Survey of Jiangsu Province, Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing 210049, China | | CAI Luming | Geological Survey of Jiangsu Province, Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing 210049, China | | LU Xurong | Geological Survey of Jiangsu Province, Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing 210049, China |
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| Abstract: |
| In order to reveal the spatial and temporal distribution characteristics and influencing factors of soil organic carbon（SOC）in Lianyungang arable land, soil samples from the surface layer（0-20 cm）and deep layer（150-200 cm）were collected and tested for SOC, total nitrogen（TN）, and total phosphorus（TP）. The results showed that the SOC content was in the medium had the highest frequency of distribution in 2004. SOC content was widely distributed in four classes：medium, upper medium, high, and very high in 2019. The shallow surface SOC of the arable land increased by 0.57 percentage point, organic carbon density increased by 1.34 kg · m-2, SOC reserves increased by 1.36 Tg, and the average rate of carbon sequestration was 7.26×104 kg·km-2·a-1 in the last 15 years（2004—2019）. The rate of carbon sequestration in soils varied considerably between soil types, with the order of grey tidal soils>coastal saline soils>sandy ginger black soils>brown tidal soils>brown loam>coarse bone soils. The SOC content of soils varied greatly between land types, and the average rate of carbon sequestration was in the order of paddy field>dryland>watered land. Soil C∶N∶P（SOC∶TN∶TP）in the study area had slightly increased over the last 15 years, indicating a slight increase in spatial heterogeneity of SOC content. Soil C∶N∶P values in the study area were significantly lower compared to arable soils in Jiangxi etc, indicating rapid mineralization and decomposition of SOC by soil microorganisms. The arable soil environment in the study area was not conducive to carbon storage. |
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