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Spatial Variation of Soil Properities in the Water-Level-Fluctuation Zone of Hubei Section of the Three Gorges Reservoir
ZHANG Shuang-yin, SHI Su-nan, FU Jun-lin, XU Jian, ZHAO Bao-cheng, CHENG Xue-jun, ZHENG Xue-dong, CHEN Yi-yun
Journal of Changjiang River Scientific Research Institute ›› 2026, Vol. 43 ›› Issue (7) : 106-114.
PDF(3239 KB)
PDF(3239 KB)
Spatial Variation of Soil Properities in the Water-Level-Fluctuation Zone of Hubei Section of the Three Gorges Reservoir
[Objective] Soil temperature, moisture content, electrical conductivity, and pH in the water-level-fluctuating zone are fundamental to assessing soil physical, chemical, and biological characteristics and conducting ecological restoration. This study aims to clarify the impact of varying flood intensity of the Hubei section of the Three Gorges Reservoir on soil properties in the water-level-fluctuating zone. [Method] This study divides the water-level-fluctuating zones of various counties in the Hubei section into four gradients: no flooding (>175 m), light flooding (175 m), moderate flooding (170 m), and severe flooding (<170 m) zones. In May 2024, in-situ monitoring of soil temperature, moisture content, electrical conductivity, and pH was conducted in different flooding intensity zones. Statistical and spatial analysis were used to reveal their spatial variability characteristics. [Results] (1) The average values of soil temperature, humidity, electrical conductivity, and pH in the Hubei section of the water-level-fluctuating zone of the Three Gorges Reservoir are 32.45 ℃, 12.58%, 41.34 S/cm, and 6.75, respectively. During the monitoring period, soil temperatures ranged from 26.4 ℃ to 43.3 ℃, the average soil moisture content was 12.58%, the soil electrical conductivity showed significant variation, and the mean pH of the soil was 6.75. (2) The variability of soil properties in the water-level-fluctuating zone of different counties were varied. The soil temperature of Yiling exhibited a decreasing trend as the intensity of flooding decreased. The soil moisture of Zigui decreased as the flooding intensities decreased. The electrical conductivity of Xingshan was generally high, with most values exceeding 60 S/cm. The pH of Badong was consistent with other counties and districts, showing no obvious patterns of change, and remained stable between 6.0 and 7.0. (3) Soil temperature exhibited the highest coefficient of variation under moderate flooding. Under moderate, light, and no flooding conditions, the coefficient of variation decreased as flooding intensity decreased, with the lowest variability observed under no flooding conditions. Soil moisture variability was largely consistent under severe and moderate flooding conditions; the variability was basically consistent under light flooding and no flooding. The variability of electrical conductivity did not show a clear pattern with changes in flooding intensity. Under severe flooding, the coefficient of variation was the highest, while under no flooding, the coefficient of variation was the lowest. The variability of pH across different flooding intensities was generally low across counties, with the highest variability observed in the moderate flooding zone. (4) In terms of the order of variability in soil properties, Yiling and Zigui were consistent, while Xingshan and Badong were consistent. The variability of soil properties in Yiling and Zigui was as follows: electrical conductivity > soil moisture > soil temperature > pH, while that in Xingshan and Badong was as follows: electrical conductivity > soil temperature > soil moisture > pH. Geographic location and spatial distance may be the primary factors influencing these differences. [Conclusion] This study presents a preliminary analysis of the variability characteristics of soil properties in the Hubei section of the Three Gorges Reservoir area under different flooding intensities based on limited data. Further monitoring with multiple frequencies and indicators (such as carbon, nitrogen, and phosphorus) is needed to reveal the spatiotemporal variability patterns of soil properties in the Three Gorges Reservoir area and provide technical support for targeted ecological restoration efforts.
soil properties / spatial variation / Three Gorges Reservoir area / water-level-fluctuating zone / flooding intensities
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