A Complete Collection of 100000 Whys
Fav十万个为什么
为什么甘蔗下部比上部甜？
甘蔗下部比上部甜，主要是因为下部糖分积累更多、生长速度较慢以及糖分运输和储存的差异。
1、下部糖分积累更多：甘蔗通过光合作用合成糖分，糖分通过韧皮部运输到植株各部位。由于重力作用和运输路径的差异，糖分更容易在甘蔗的下部积累，导致下部比上部更甜。
2、生长速度较慢：甘蔗下部的生长速度较慢，这使得糖分有更多时间在组织中积累，而生长旺盛的上部则消耗更多糖分用于生长，导致甜度较低。
3、糖分运输和储存的差异：甘蔗的韧皮部负责糖分的运输，糖分从叶片运输到茎部后，由于重力作用和储存机制，更多糖分沉积在下部，使得下部甜度更高。
总结：甘蔗下部比上部甜，主要是因为下部糖分积累更多、生长速度较慢以及糖分运输和储存的差异。
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