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物候是指植物随气候的变化而出现的自然节律现象,如萌芽、开花、展叶、果熟、落叶等。人们通过长期的生产实践,注意到0℃、5℃、10℃、15℃等温度,对树木生长有一定的指示作用。当温度到0℃时,土壤开始解冻或冻结,可把它当作植树土壤操作起、止日期的指示。温度在5℃以上时,多数树木树液流动后开始生长,称“植物生长期”。
Phenology refers to the phenomenon of natural rhythms that plants appear with changes in climate, such as germination, flowering, leaf expansion, fruit ripening, deciduous and so on. People through long-term production practices, noting 0 ℃, 5 ℃, 10 ℃, 15 ℃ temperature, the growth of trees have some instructions. When the temperature reaches 0 ° C, the soil begins to thaw or freeze, which can be used as an indicator of plantation soil operations starting and ending dates. When the temperature is above 5 ℃, most trees begin to grow after they flow, which is called “plant growth stage”.