冬天,大部分植物已经凋零,只有那些常绿的针叶树还挺拔地站立山头。这是因为松针的表面上多了一层蜡质,既滑赋又保温;叶的表皮也角质化了,叶肉内的松脂增多,糖分的比例显著加大,这就增强了抵御严寒的能力。 冬天,对于北方的植物虽然是无情的, In winter, most of the plants are already decaying, and only those evergreen conifers stand tall and straight. This is because the surface of the pine needle is covered with a layer of wax that is both slippery and moist and warm; the epidermis of the leaf is also keratinized, the amount of turpentine in the leaf is increased and the proportion of sugar is significantly increased, which enhances the ability to withstand the cold. Winter, although the northern plant is ruthless,