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| Temporal and spatial variation characteristics and influencing factors of soil nickel background value in Guangdong Province |
| Received:July 19, 2025 |
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| KeyWord:Guangdong;soil;background value;nickel;temporal and spatial changes |
| Author Name | Affiliation | E-mail | | LUO Xiaoling | Guangdong Ecological Environment Monitoring Center, Guangzhou 510308, China | | | LIANG Yaojie | Guangdong Ecological Environment Monitoring Center, Guangzhou 510308, China | | | WANG Zhongwei | Guangdong Ecological Environment Monitoring Center, Guangzhou 510308, China | | | XIE Zhiyi | Guangdong Ecological Environment Monitoring Center, Guangzhou 510308, China | 86261961@qq.com | | CHEN Duohong | Guangdong Ecological Environment Monitoring Center, Guangzhou 510308, China | | | LIU Jun | Guangdong Ecological Environment Monitoring Center, Guangzhou 510308, China | |
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| Abstract: |
| In order to clarify the variation trend of soil nickel background value and its influencing factors in Guangdong Province, this study analyzed the variation characteristics of soil nickel content based on the fixed-point monitoring in the background value area in 2018 and 2022. Geographically weighted regression analysis was used to explore the effects of natural factors, human factors and physical and chemical properties on soil nickel content in the background value area.The results showed that the soil nickel content in the A layer of the background value area in Guangdong Province was generally low, and the spatial distribution pattern was‘low in the middle and high around’. The high value area was located in the Leizhou Peninsula in western Guangdong, and the second high area was located in the mountainous area of northern Guangdong and the coastal area of the Pearl River Delta. At the original data scale, the median, arithmetic mean and geometric mean of soil nickel content in layer A of the province's background value area in 2022 were 13.0, 17.6 mg·kg-1 and 12.6 mg·kg-1, respectively, which decreased by 1.0, 0.4 mg·kg-1 and increased by 1.5 mg·kg-1 compared with 2018. After logarithmic transformation, the mean value decreased by about 11%, indicating that the soil nickel content in the background area generally showed a downward trend. In summary, among the various variable influencing factors, physical and chemical properties（especially cation exchange capacity）have a greater impact on soil nickel content, and human and natural factors have limited interference. |
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