Rainfall Erosion Characteristics of Young Citrus Orchards on Calcareous Soil and Red Soil Slopes in Karst Areas of Northwest Guangxi
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    Abstract:

    In order to investigate the characteristics of rainfall erosion of young citrus orchards on calcareous soil and red soil slopes in karst areas of northwestern Guangxi, an indoor artificial simulated rainfall experiment was conducted to study the runoff and sediment yield characteristics of young citrus orchards on calcareous soil and red soil slopes under three rainfall intensities (30, 60, and 90 mm/h). The results showed that: (1) When the rainfall intensity was 30 and 60 mm/h, the total runoff yield of red soil citrus orchards was 2.46 and 1.83 times that of calcareous soil citrus orchards, respectively, and the red soil citrus orchards was dominated by surface runoff yield, while the calcareous soil citrus orchards was dominated by subsurface flow yield; when the rainfall intensity was 90 mm/h, there was no significant difference in the total amount of runoff between the two (p>0.05), and both of them were mainly by surface runoff. (2) The surface runoff intensity of calcareous soil citrus orchards and red soil citrus orchards increased with the increase of rainfall intensity. However, with the increase of rainfall intensity, the subsurface flow intensity of calcareous soil citrus orchards showed a trend of first increasing and then decreasing, while the subsurface flow intensity of red soil citrus orchards was decreasing. (3) When the rainfall intensity was 60 mm/h, the total sediment yield of red soil citrus orange orchards was 3.74 times that of the calcareous soil citrus orchards, and when the rainfall intensity was 90 mm/h, the total sediment yield of the calcareous soil citrus orchards was 2.86 times that of red soil citrus orchards. During the rainfall process, the sediment yield of calcareous soil citrus orchards fluctuates sharply with the increase of rainfall duration, while the sediment yield of red soil citrus orchards was relatively small with the increase of rainfall duration. (4) When the rainfall intensity was more than 60 mm/h, there was a significant linear relationship between the cumulative sediment yield and cumulative runoff yield of calcareous soil and red soil orchards, and the greater the rainfall intensity, the more obvious the linear relationship was. The research results can provide reference and reasonable suggestions for the prevention and control of soil erosion in young citrus orchards on calcareous soil and red soil slopes in karst areas.

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History
  • Received:April 17,2023
  • Revised:
  • Adopted:
  • Online: December 27,2023
  • Published: December 28,2023