environ. |
defoliation 1. The drop of foliage from plants caused by herbicides such as Agent Orange, diuron, triazines, all of which interfere with photosynthesis. The use of defoliants, as in Vietnam or in jungle clearance for agriculture, can permanently destroy tropical forests. Once the tree cover is removed, the soil is subjected to erosion and precious nutrients are rapidly leached away. 2. Destroying (an area of jungle, forest, etc.) as by chemical sprays or incendiary bombs, in order to give enemy troops or guerilla forces no place of concealment (1. 因使用如橘剂、敌草隆、三氮六环等会干扰光合作用的除草剂而造成叶片掉落。 使用落叶剂,如在越南或在为农耕而清出的丛林空地上,会永远地破坏热带雨林。 一旦移除了树木的遮蔽,土壤就易受侵蚀,而重要的养份会快速流失。 2.为了让敌方军队或游击队无处可藏,而喷洒化学药剂或使用燃烧弹所造成(丛林、森林地等)的破坏。) |