Elevation-based Differentiation in Moisture and Nutrients of Sedimentary Layer in the Water-Level Fluctuation Zone of the Three Gorges Reservoir, China

• Published in: Shui tu bao chi xue bao Vol. 39; no. 2; pp. 209 - 217
• Main Authors: HE Pingsheng, LI Jinlin, HE Xiubin, TANG Qiang, WU Shengjun, HUANG Ping
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Journal of Soil and Water Conservation 01.04.2025
• Subjects: properties of soil moisture and nutrients; sediments; spatial differentiation; the three gorges reservoir; water-level fluctuation zone
• ISSN: 1009-2242
• DOI: 10.13870/j.cnki.stbcxb.2025.02.028

［Objective］ To investigate the elevation-based differentiation in moisture and nutrients of sedimentary layer in the water-level fluctuation zone (WLFZ) and provide a scientific basis for reservoir management. ［Methods］ The WLFZ of the Three Gorges Reservoir was selected as the research object and layered sample were collected from a representative slope. The particle size distribution, nutrient concentration, and moisture content were measured, and the differences in sediment properties at different elevations were analyzed. ［Results］ 1) The particles of the sediment in the WLFZ were relatively fine, with a median particle size ranging from 6.1 to 13.5 μm and an average of 8.7 μm. No significant difference in median particle size was observed among sediments at varying elevations (p>0.05). The particle size distribution of the sediments was dominated by silt, with an average volume content of 82.7%, and the contents of clay and sand were 14.2% and 3.1%, respectively. 2) The mean total organic carbon (TOC), t