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[1]Shi Dewei,Cheng Jinhua,Li Mingfeng.Characteristics and Attribution of Soil Preferential Flow of Typical Vegetation in the South of Yongding River Plain[J].Research of Soil and Water Conservation,2024,31(01):232-240.[doi:10.13869/j.cnki.rswc.2024.01.025]

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Characteristics and Attribution of Soil Preferential Flow of Typical Vegetation in the South of Yongding River Plain

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 01 Page number: 232-240 Column: Public date: 2024-02-20

Title:: Characteristics and Attribution of Soil Preferential Flow of Typical Vegetation in the South of Yongding River Plain

Author(s):: Shi Dewei, Cheng Jinhua, Li Mingfeng; (School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China)

Keywords:: Yongding River; preferential flow; bright blue dye tracing method; principal component analysis

CLC:: S714.2

DOI:: 10.13869/j.cnki.rswc.2024.01.025

Abstract:: [Objective] The aims of this study are to examine the preferential flow phenomenon in the Yongding River Plain, to analyze its morphological characteristics and development degree, to identify the main factors affecting preferential flow, and provide a theoretical basis for the protection of freshwater resources and the restoration of ecological environment in the region. [Methods] Willow, wattle and Setaria viridis of three typical vegetation were taken as objects. The original soil samples and dyed profile images were obtained by field brilliant blue dye tracing test under 25 mm infiltration water(heavy rain). Image processing technology was used to analyze the morphological rule of water and solute infiltration in soil, and combined correlation analysis and principal component analysis were used to study the response of different soil factors to the generation and development of preferential flow. [Results](1)The preferential flow of the willow, Jing, and dogtail soil concentrated at 10—40 cm, 10—40 cm, and 10—30 cm, respectively. The maximum chromosome depth was 40.0 cm, 44.8 cm, and 31.5 cm. Different vegetation types of vertical section showed that the chromosomal area decreased compared with the depth of the soil layer.(2)The degree of preferential development was a willow-like land>ine-like>dogtail-like land. The differential ratio and length index of the chromosomal area of the willow-like land were significantly different(p<0.05), and the differences between the two planting of the neither of the two planting of the tattoo(p>0.05).(3)The contribution rate of the content of the other party's variant was 24.824%, and the contribution rate of root weight density and organic content was 46.312%. [Conclusion] Among the three typical vegetation in the south of the Yongding River Plain, the first willow-sample of soil preferential flow occurred, forming the highest degree of preferential chromatization. The phenomenon of preferential flow was the most obvious, while the dogtail-like land was the least obvious. With the increase of the amount of water seepage, the soil moisture movement showed the overall downward movement, deepening the depth of the differential interface of the soil water flow, i. e., the dyeing of the 0—20 cm soil layer was relatively stable. Soil machinery composition and less than 5 mm root system are important factor affecting the development of preferential flow. Because the growth and development of vegetation in various places is different, the impact on soil preferential flow is not the same. There are certain differences in differentiation.

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Last Update: 2024-02-20