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[1]JIANG Mangzhou,WANG Jianfang.Effect of Patterns of Land Surface on the Charateristics of Hydrodynamics of Overland Flow in Typical Herbaceous Communities of Sloping Lands on the Loess Plateau[J].Research of Soil and Water Conservation,2023,30(04):61-68.[doi:10.13869/j.cnki.rswc.2023.04.002.]

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Effect of Patterns of Land Surface on the Charateristics of Hydrodynamics of Overland Flow in Typical Herbaceous Communities of Sloping Lands on the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 04 Page number: 61-68 Column: Public date: 2023-06-10

Title:: Effect of Patterns of Land Surface on the Charateristics of Hydrodynamics of Overland Flow in Typical Herbaceous Communities of Sloping Lands on the Loess Plateau

Author(s):: JIANG Mangzhou¹, WANG Jianfang²; (1.State Key Laboratory of Rail Transit Engineering Informatization(FSDI), Xi'an 710043, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: flow velocity; runoff; overland flow resistance; Bothriochloa ischcemum(Linn.)Keng; Artemisia vestita Wall. ex Bess

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.04.002.

Abstract:: [Objective] The influence of near-surface characteristics of vegetation community on the hydrodynamic parameters of overland flow was elucidated, and the mechanism of the influence of near-surface characteristics of vegetation community on soil erosion process was revealed, in order to provide theoretical guidance for the evaluation of eco-hydrological effects of vegetation restoration in grassland on the Loess Plateau. [Method] Herbaceous plant communities of Bothriochloa ischcemum (Linn.)Keng and Artemisia vestita Wall. ex Bess were selected. Artificial simulated rainfall experiments(rainfall intensity: 60 mm/h; Rainfall duration: 60 min)were conducted in herbaceous plant communities with different near-surface characteristics. [Results](1)With the decrease of plant community elements, the flow pattern changed from slow flow to rapid flow. Runoff velocity decreased by 8.66%～76.79%, runoff decreased by -12.45%～49.30%, and resistance increased by 62.55%～4 346.92% and 33.16%～717.25%.(2)Biological soil crust had the greatest effect on the decrease of flow velocity, increasing by 54.44%～199.32% and 225.31%～425.95%, respectively, compared with aboveground part and root system. The aboveground part had the strongest effect on resistance increase, which increased by 175.76%～4 676.57% and 29.68%～1 114.74% compared with biological soil crust and roots, respectively. The effects of the near-surface factors on the runoff were not consistent. The biological soil crusts of aboveground part of Bothriochloa ischcemum (Linn.)Keng and Artemisia vestita Wall. ex Bess could reduce the runoff, while the other factors could increase the runoff.(3)The effects of overground part and root of Bothriochloa ischcemum (Linn.)Keng on decreasing velocity and increasing Darcy-Weisbach resistance coefficient were greater than those of Artemisia vestita Wall. ex Bess, while the effects of biological soil crusts were less than those of Artemisia vestita Wall. ex Bess. Aboveground part and biological soil crust of Bothriochloa ischcemum(Linn.)Keng on the Manning roughness coefficient increases effect was lower than Artemisia vestita Wall. ex Bess, the effect of root was higher than Artemisia vestita Wall. ex Bess. The decrease of runoff in aboveground part of Bothriochloa ischcemum (Linn.)Keng community increased by 4 367.80% compared with Artemisia vestita Wall. ex Bess. The effect of soil crusts on increasing runoff yield was 183.52% higher than that of Artemisia vestita Wall. ex Bess. The root system of both Bothriochloa ischcemum(Linn.)Keng and Artemisia vestita Wall. ex Bess communities could increase runoff yield, and the increasing effect of Bothriochloa ischcemum(Linn.)Keng community was 49.77% less than that of Artemisia vestita Wall. ex Bess. [Conclusion] The aboveground part of vegetation, biological soil crust and root system can reduce the velocity and discharge. The Darcy-weisbach resistance coefficient and Manning roughness coefficient increased, but the decreasing or increasing of near-surface characteristics of vegetation communities on hydrodynamic characteristics was different due to the difference of plant species.

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Last Update: 2023-06-10