[1]ZHU Zhizhuo,LI Long,ZHANG Peng,et al.Influence of Vegetation Pattern on Microtopography and Erosion Under Hydraulic Erosion in Feldspathic Sandstone Region[J].Research of Soil and Water Conservation,2023,30(03):10-18,26.[doi:10.13869/j.cnki.rswc.2023.03.040]
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Influence of Vegetation Pattern on Microtopography and Erosion Under Hydraulic Erosion in Feldspathic Sandstone Region
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 03
Page number:
10-18,26
Column:
Public date:
2023-04-10
- Title:
- Influence of Vegetation Pattern on Microtopography and Erosion Under Hydraulic Erosion in Feldspathic Sandstone Region
- Keywords:
- feldspathic sandstone; vegetation pattern; microtopography; runoff and sediment production
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.03.040
- Abstract:
- [Objective]Studying the relationship between micro-topography and erosion under vegetation pattern can provide theoretical reference for the study of slope erosion law and soil and water loss control in feldspathic sandstone area. [Methods] Slopes with three planting patterns(uniform distribution, aggregation distribution, random distribution)in BaoJia watershed in feldspathic sandstone areas were selected as the research sites. Field measurements in runoff plots under the condition of natural rainfall and 3D laser scanning technology were jointly used, to analyze the influence of the vegetation pattern of microtopography and erosion. [Results] After rainfall, the order of discharge and sediment yield on different vegetation patterns was bare slope>aggregate slope>random slope>uniform slope. Compared with bare slope, discharge and sediment yield on uniform slope decreased by 64% and 75%, respectively. The fitting function of runoff and sediment is Y=0.3619x0.7309, R2=0.9866. There were some differences in the spatial distribution of erosion-deposition on slopes with different vegetation patterns. Compared with other slopes, the soil erosion intensity of homogeneous slope was the weakest, the erosion area was the smallest(12.38 m2), and the sediment area was the largest(3.44 m2). The slope topographic factors of different vegetation patterns showed the increasing trend with rainfall, and compared with bare slope, increments of the surface roughness, surface undulation, surface cleanness and micro-slope were the least, which were 5%, 2%, 0.5% and 9%, respectively. The correlations between surface roughness and runoff and sediment yield were 0.632 and 0.619, respectively. Compared with other slopes, the fitting effect of topographic factors on bare slope and sediment yield was the best. The fitting functions of runoff and sediment were expressed as X=0.993RA-1.07R+0.871,R2=0.996, Y=1.586RA-0.62R+2.65,R2=0.964, respectively. [Conclusion] The uniform distribution pattern has the best inhibition effect on soil erosion on feldspathic sandstone slope under hydraulic erosion condition, but the fitting effect is the worst. The interaction between microtopographic factors and sediment production and drainage is the most complex.
- References:
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Last Update:
2023-04-10