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A video camera recording method for measuring terminal velocity of seed dispersal by wind

Journal of Forestry Research 2021年第1期32卷 81-90页

作者： Minghu Liu Zhiming Xin Zhi Su Yingming Zhao Xinle Li Zhimin Liu Mariano ACony Wei Liang Xuanping Qin Jianqiang Qian Xue Cui Quanlai Zhou Experimental Center of Desert Forestry Chinese Academy of Forestry1 Shiyan LaneTuanjie RoadDengkou 015200People’s Republic of China Institute of Applied Ecology Chinese Academy of Sciences72 Wenhua RoadShenyang 110016People’s Republic of China Instituto Argentino de Investigaciones de las Zonas Aridas-CONICET CC.5075500 MendozaArgentina University of Chinese Academy of Sciences 19 Yuquan RoadBeijing 100049People’s Republic of China Henan Agricultural University 63 Nongye RoadZhengzhou 450002People’s Republic of China Station of Forest and Grassland Pest Control and Quarantine Shenyang 110804Liaoning ProvincePeople’s Republic of China

An accurate and convenient method is essential for measuring the terminal velocity of seeds dispersed by *** and random errors produced by existing methods lower the accuracy and convenience in determining seed terminal *** this study,a video camera was used to record the falling process of forty-one species of wind-borne seed with eight appendage structures and seven aerodynamic behaviors in a settling tower at a speed of 50 frames per second(fps).The videos were analyzed by Quick Time Player to determine seed acceleration height,acceleration time,and terminal *** results showed that acceleration height and time,terminal velocity,and the diff erence between terminal velocity and descent velocity(DTD)increased with wing *** with dropping methods,the camera recording method eliminated the eff ect of acceleration and corrected seed terminal *** on wing loading,release heights were determined for accurate measurement of terminal velocity of diff erent *** method,due to its inexpensive equipment,high accuracy,easy observation and operation,can be applied to measure the terminal velocity of wind dispersed seeds,and provides a promising method in exploring the dispersal process of seeds.

关键词： Acceleration height Acceleration time settling tower Aerodynamic behavior Appendage structures

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