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| DOI： |
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| Soil Physical Properties and Spatial Distribution Characteristics of Floodplains in Medium or Small Hilly Rivers |
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CAO Weijie, XIA Jihong, WANG Yingjun, BI Lidong, LIN Lihuai, YI Zihan, YU Genting, DING Mingming
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College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China；.Longyou Water Conservancy Bureau, Longyou 324400, China; Nanjing Water Conservancy Bureau, Nanjing 210098, China
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| Abstract: |
| To explor the soil physical properties and spatial distribution characteristics of floodplains in medium or small hilly river, the soil density, soil bulk density, porosity, saturated water holding capacity, particle composition and fractal dimension of floodplains were studied in Longyou County, Zhejiang Province using field survey methods and laboratory analysis. There were significant differences in soil physical properties in different river segments and land patterns, which was presented in detail as: ① soil density decreased from upstream to downstream. In middle reaches, the total porosity and saturation water holding capacity the soil were the largest and the bulk density was the smallest; ② soil particles were mainly composed of coarse particles (coarse sand, fine sand). As the river gradient slackened, the content of coarse particles decreased and fine particles (silt, clay) content and the value of fractal dimension (D) increased. Fine soil particles become more and more from upstream to downstream.③ Because of the influence of the flow condition and vegetation types, on a different beach elevation the content of fine particles and the value of fractal dimension (D) of the woodland soil were the highest in high floodplain, which was 36.38 and 2.66 respectively. Soil particle fractal dimension can reflect the influence of sedimentary environment and the land use ways on soil particle size distribution. |
| Key words: medium or small hilly river; floodplains; soil physical properties; fractal dimension |
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