利用无人机近距离观察园林树木上的寄生植物

高等寄生植物引起的病害是一类特殊的病害,特别是当寄主为高大的园林树木时,这类病害更加难以观察和理解。利用机动灵活的无人机近距离观察园林树木树冠上的两种寄生植物——桑寄生和槲寄生。结果表明,对于不同的寄主,桑寄生均生长在树冠的外层;一般老叶为绿色,嫩叶为红色。槲寄生生长在寄主南洋楹树冠的内层,但当南洋楹Falcataria moluccana的上层树冠枝叶枯死后,其位置变为树冠的外层;同时槲寄生的颜色也因为暴露在阳光直射之下由绿色转变为黄绿色。

UAV-based Short Distance Observation on Parasite Plant of Landscape Trees

Plant disease caused by higher parasite plant is special. It is difficult to observe and understand when the hosts are tall and big landscape trees. Unmanned aerial vehicle (UAV) is flexible and adaptable, which can fly near the host crown to observe parasite plant. Results showed thatLoranthus parasiticus always grew at the outer layer of the host crown, regardless of the host species; the old leaves ofLoranthus parasiticus were usually green. But young ones were red.Viscum diospyrosicolum usually grew at the inner layer of the hostFalcataria moluccana, but after outer layer of host crown died, the location of Viscum diospyrosicolum became outer layer of crown. Moreover, its color changed from green to yellow-green because of direct exposure to sunlight.