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[1]ZHU Bonian,DANG Xiaohong,MENG Zhongju,et al.Effects of Biodegradable Poly Lactic Acid(PLA) Sand Barrier on Wind Prevention and Sand Fixation in Urumqi Sandy Land[J].Research of Soil and Water Conservation,2023,30(02):431-437.[doi:10.13869/j.cnki.rswc.2023.02.016]

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Effects of Biodegradable Poly Lactic Acid(PLA) Sand Barrier on Wind Prevention and Sand Fixation in Urumqi Sandy Land

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 431-437 Column: Public date: 2023-03-10

Title:: Effects of Biodegradable Poly Lactic Acid(PLA) Sand Barrier on Wind Prevention and Sand Fixation in Urumqi Sandy Land

Author(s):: ZHU Bonian¹, DANG Xiaohong^1,2, MENG Zhongju¹, LIN Bo¹, LIU Ping³; (1.Institute of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China; 2.Inner Mongolia Hangjin Desert Ecological Position Research Station, Ordos, Inner Mongolia 017400, China; 3.Dalate County Forestry and Grassland Dtation, Ordos, Inner Mongolia 014300, China)

Keywords:: PLA sand barrier; windbreak fixation; sediment runoff; mechanical composition; Urumqi sandy land

CLC:: P941.75; S152.3

DOI:: 10.13869/j.cnki.rswc.2023.02.016

Abstract:: In order to explore the effect of PLA sand barrier on desertification control in Urumqi sandy land, PLA sand barriers of different sizes(square length: 0.5 m×0.5 m, 1 m×1 m, 2 m×2 m and 3 m×3 m)were laid in grid shape. The wind erosion characteristics of sand barriers with different specifications were studied. The bare sandy land was set as the control(CK), and HOBO portable wind speed acquisition instrument was used to observe the wind speed at heights of 10 cm, 20 cm, 50 cm, 100 cm and 200 cm above the surface. At the same time, the automatic rotary sand collector was used to collect the sediment transport at 0—30 cm height near the surface, and the variation characteristics of windbreak efficiency, sand fixation efficiency and sand carrying diameter of wind-blown sand flow were analyzed. The results show that:(1)when the PLA sand barrier size is less than 3 m×3 m, the wind speed profile presents an S-shaped change trend; the average surface roughness of PLA sand barrier is 0.64 cm, and that of CK is 0.51 cm, which is 25.48% higher than that of PLA sand barrier;(2)sediment transport decreases by 38.72%～75.69% after PLA sand barrier was laid; the sediment transport rate of PLA barrier shows a good exponential relationship with height(R²>0.77); the overall surface roughness decreased in the order: 1 m×1 m>0.5 m×0.5 m>2 m×2 m>3 m×3 m>CK; the sand fixation benefits of 1 m×1 m and 2 m×2 m sand barriers are higher than these of the other two types of sand barriers, and the sand fixation benefit of 3 m×3 m sand barriers is the lowest, basically close to CK;(3)the size of wind erosion particles in Urumqi sandy land is between 2～500 μm, and most of the particles are fine sand between 100～250 μm; After PLA sand barrier was laid, the fine sand content in the barrier increases by 8.70%～11.94%, the contents of medium sand decreases by 10.63%～14.06%(p<0.05). In conclusion, laying PLA sand barriers can effectively reduce near-surface wind speed in Urumqi sandy land, increase surface roughness. reduce near-surface sediment transport, and change the aeolian sand flow structure of 0—30 cm height, which has better control effect.

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Last Update: 2023-03-10