树木的物候现象,就是树木受气候等外界环境的影响而呈现的综合反映。研究这种现象的目的,是揭示某一地区自然季节现象变化的规律。世界上有很多国家,如法国、西德、挪威、苏联、意大利等,都曾制定过地区性的物候历,用以预报农时,指导农、林业适时播种和收获;预测病虫害的发生;为园林规划设计提供可靠依据。 Phenological phenomenon of trees is the comprehensive reflection of the trees exposed to the external environment such as climate. The purpose of studying this phenomenon is to reveal the law of natural seasonal phenomena in a certain area. There are many countries in the world, such as France, West Germany, Norway, the Soviet Union, Italy and so on. All of them have formulated regional phenological calendar to forecast the agricultural time, guide the timely sowing and harvesting of agriculture and forestry, predict the occurrence of pests and diseases, Planning and design to provide a reliable basis.