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| DOI：10.13522/j.cnki.ggps.2023346 |
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| Spatial distribution of soil organic carbon in the plough layer in the region of Zhengzhou |
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GU Zhiyun, LIAO Shijin, ZHAO Xinlei, FU Qiaoling, SHENG Qi, LI Bing, GUO Qiang, DU Baojun
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1. Henan Academy of Geology, Zhengzhou 450001, China; 2. Henan Research Center of Urban Geological Engineering Technology, Zhengzhou 450001, China; 3. Henan Geochemistry Ecological Restoration Engineering Technology Research Center,
Zhengzhou 450001, China; 4. Fifth Geological Exploration Institute of Henan Bureau of Geological and Mineral Exploration and Development, Zhengzhou 450001, China
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| Abstract: |
| 【Objective】Soil organic carbon (SOC) is not only an indicator of soil health but also plays a crucial role in feedback interaction between global warming and carbon stock in terrestrial ecosystems. Its dynamics is modulated by a multitude of interactive abiotic and biotic factors. In this paper, we analyze the spatial distribution of SOC in the plough layer and its correlation with soil texture and other geochemical properties in the region of Zhengzhou in Henan province.【Method】Soil samples were taken from a grid network in the region. SOC, bulk density, soil texture and other geochemical properties in each soil sample were measured. The correlation between SOC and soil nutrients, including nitrogen, phosphorus, potassium and micronutrients in the soil, was analyzed using the GeoChemStudio software.【Result】The calcareous skeletol soil in the region has the highest SOC, reaching 2.307%. The SOC content varied from 0.1%-11.6% across the region, and was normally distributed with a mean of 1.134%. The SOC was positively correlated with N, P2O5, Fe, Mn, Zn, Cu, Mo and B, and their associated correlation coefficients were 0.804 5, 0.223 0, 0.156 3, 0.119 1, 0.223 8, 0.263 4, 0.162 8 and 0.191 1, respectively. Negative correlations were found between SOC and K2O and pH, and their associated correlation coefficients were -0.088 8 and -0.195 7, respectively. The average SOC content in the plough layer in the region was 1.09%. Spatially, SOC was rich in Xinmi, Dengfeng and Gongyi in the southwest of the region. In terms of soil texture, SOC is higher in skeletol soil and calcareous cinnamon soil than in other soils. SOC stored in the topsoil in the whole region was 1 012.87×104 t, with 523.13×104 t stored in the cinnamon soils and calcareous cinnamon soils, accounting for 51.64% of the total topsoil SOC in the region. |
| Key words: soil; organic carbon; soil nutrients; Zhengzhou region |
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