The trajectory of umbrage motion shaped a butterfly arc belt. The situations of outside and inner arc belt were influenced by height of tree (H) and the height below branch respectively.
试验区树荫运动轨迹呈蝶形弧带变化，树高影响投影外弧线位置，枝下高影响投影内弧线位置；
The trajectory of umbrage motion shaped a butterfly arc belt. The situations of outside and inner arc belt were influenced by height of tree (H) and the height below branch respectively.
试验区树荫运动轨迹呈蝶形弧带变化，树高影响投影外弧线位置，枝下高影响投影内弧线位置；
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