Zhu Mengxue, Zhao Yangyi, Duan Xu, et al. Morphological Distribution Characteristics of Preferential Flow in Red Soil of Forest and Grassland in Arid and Hot Valley of Honghe River[J]. Bulletin of Soiland Water Conservation, 2021, 41(4): 9-16.
DOI:
Zhu Mengxue, Zhao Yangyi, Duan Xu, et al. Morphological Distribution Characteristics of Preferential Flow in Red Soil of Forest and Grassland in Arid and Hot Valley of Honghe River[J]. Bulletin of Soiland Water Conservation, 2021, 41(4): 9-16. DOI: 10.13961/j.cnki.stbctb.2021.04.002.
Morphological Distribution Characteristics of Preferential Flow in Red Soil of Forest and Grassland in Arid and Hot Valley of Honghe River
[Objective] The preferential flow morphology and characteristics of red soil in the arid and hot valley of the Honghe River was studied
in order to provide theoretical basis for regional water resources management and soil erosion prevention. [Methods] Taking typical vegetation—woodlands and wild grasslands in arid and hot valley regions as the research objects
the morphological distribution characteristics of preferential flow and its response to the characteristics of read soil were studied by using field dye tracing method and image processing technology. [Results] ① The average stained area of forest and grassland was 87.2% and 91.97% respectively. The stained area decreased with the increase of soil layer
and rebounded in local depths. The preferential flow length index of forest and grassland was 766.8% and 730.0% respectively. And the priority flow of the forest was more developed than wasteland. The maximum staining depth of forest and grassland was 40 cm and 35 cm respectively. ② The width of the dyeing path decreases with the increase of the soil layer. In the 0—20 cm soil layer
the main dyeing path was greater than 250 mm. The dyeing path within 20—40 cm was mainly in the layer between 20—250 mm
and the dyeing path was less than 20 mm in the soil layer below 40 cm. ③ There were significant correlations between the priority flow dyeing area
length index
dyeing path width and soil factors. The cumulative contribution rate of total porosity
organic matter
and moisture content to dyeing area ratio (DA)
length index (LI) and dyeing path width (SPW) was 97.8%
86.95%
87.45%
respectively. The factors such as moisture content
organic matter
bulk density
total porosity and Al3+ had the best linear relationship with dyeing area and dyeing path. [Conclusion] The combined effects of soil pore characteristics
base ions
and soil texture ultimately led to the difference in preferential flow between forest and grassland in the arid and hot valley of the Honghe River.
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