A Complete Collection of 100000 Whys
Fav十万个为什么
为什么有些植物能生存沙漠？
1、沙漠植物通常具有深根系统，能够深入地下寻找水源，从而在干旱环境中生存。
2、这些植物的叶片往往较小或覆盖有绒毛，以减少水分蒸发，提高水分利用效率。
3、许多沙漠植物能够进行肉质化储存水分，如仙人掌的茎，可以在雨水充足的时期储存大量水分，以应对长时间的干旱。
4、沙漠植物通常具有高效的蒸腾作用调节机制，能够在高温下减少水分损失，如通过关闭气孔来减少水分蒸发。
5、一些沙漠植物能够进行光合作用的替代途径，如景天酸代谢（CAM），这种代谢方式可以在夜间吸收二氧化碳，白天再进行光合作用，减少水分损失。
总之，沙漠植物通过多种适应性特征，如深根系统、小叶片、肉质化储存、高效蒸腾作用调节和替代光合作用途径，能够在极端干旱的环境中生存。
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