本研究於2019年7月2日利用無人飛行載具(UAV)承載行政院農業委員會水土保持局於2018年研發之植生粒劑至嘉義縣阿里山鄉樂野村境內一處崩塌裸露地(E120°41'37'' ；N23°28'12'')進行投擲試驗，於崩塌地選定裸露坡面坡度分別為3°、4.5°及41°之區位為樣區(面積5×5 m2)，每樣區擲植生粒劑2 Kg(約670顆)，於投擲後對樣區坡面採第1個月每週1次及第2個月1次進行定焦正射攝相，再經影像辨識軟體Image J對樣區內有植物生長覆蓋面積進行色譜分析，並扣除樣區內無法植生覆蓋之裸地面積，可求得二者面積之比例以作為覆蓋率。初步研究成果顯示：植生粒劑可適用於崩塌地中游及下游坡面，且投擲於崩塌地後之覆蓋率與時間二者具有顯著相關之曲線遞增趨勢。植生粒劑投擲於崩塌地下游較緩坡面，應注意局部地表逕流集中下之流失；植生粒劑投擲於崩塌地中游較陡坡面，若遇有緩降坡面之平台處，會因岩屑、塊石及崩積土混雜，而有利於其被阻擋或嵌入縫隙而停置坡面。

The study was focused on the assessment of coverage rate variation after that unmanned aerial vehicle (UAV) airdrop operation on July 2, 2019 with vegetation pellet promoted by Soil and Water Conservation Bureau, Council of Agriculture, Executive Yuan. The experiment site(E120°41'37''； N23°28'12'') was located at Leye Village, Alishan Township, Chiayi County, and four airdrop plots (enclose area 5×5 m2) had selected midstream and downstream of landside gradient with 3°, 4.5°and 41° . Each airdrop plot weight of vegetation pellets were near to 2 Kg (about 670 pellets). To take pictures of fixed focus orthophoto had performed once a week in the first month and once in the second month. All the pictures had applied by image recognition software Image J to identified coverage and deducted exposed area, and coverage rate of planting could be calculated. The primary results had shown as follow: the vegetation pellet was applicable to midstream and downstream of landslide, the relationship between coverage rate and period after UAV airdrop operation were nonlinear with an increasing tendency for these areas. Airdrop vegetation pellet in landside which downstream area had to notice pellet could be washed away by factional runoff accumulation, and midstream area should notice downhill of small terrace since there were cuttings, rocks and colluvial soil were suitable for pellet remain on the slopeland.