Numerical Wind Tunnel Simulation of Psammophyte Seed Wind Dispersal Along Railway Lines

doi:10.11924/j.issn.1000-6850.casb18040086

Abstract

Abstract: To study the ecological adaptation strategy of the seed wind dispersal mechanism of psammophyte along railway lines, 5 Artemisia species along railway lines in sand dune areas in northwestern Liaoning Province were studied. With the aid of the fluid dynamics equation and computer graphics technology, the numerical wind tunnel was used to simulate and forecast the variation trend of seed dispersal time and dispersal distance at different wind speed and seed releasing heights. The results of software simulation showed that: (1) at the same seed releasing heights and the same wind speed, the flight time and flight distance of 5 Artemisia species showed the opposite trend with seed weight, the horizontal flight time and flight distance were shortened while the seed weight increased; (2) at the same seed releasing heights and the different wind speed, the flight time and flight distance of 5Artemisia species showed the same trend with wind speed, the flight time and flight distance increased while the wind speed increased; (3) at the same wind speed and the different seed releasing heights, the flight time and flight distance of 5Artemisia species showed the same trend with seed releasing heights, the flight time and flight distance increased while the seed releasing heights increased. Seed weight, wind speed and seed releasing heights are sensitive factors that influence seed dispersal time and dispersal distance, and should be taken into consideration in the selection of suitable plant sand-control in the sandy area along railway lines for ecological restoration.

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