天气预报 > 其他 > 枫叶先红还是先黄
枫叶先红还是先黄
更新时间: 2020-07-15 00:00:00  

秋天天气冷,树叶输送养料的能力减弱了,叶子里经过光合作用制造出的葡萄糖输送不出叶子,留在叶子里,变成花青素,叶子就逐渐变红了与此同时,由于天气变冷叶子里的叶绿素不断分解,绿色减弱,被红色代替。由于花青素遇酸性才呈红色,所以只有酸性的叶子才能变红,枫叶 是酸性叶,所以秋天它都变成红色。秋天的时候,叶绿素被破坏,如果这时只剩下叶黄素,叶子就变成黄色的了。

关键词: 枫叶 还是

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