地表潮气转变成水蒸气所需要的大部分能量是来自地表的太阳辐射能.能量的大小取决于地表反照率.而反照率是由地表植被所决定的，这些植被能吸收比秃壤更多的热量.越过茂密的植被，大量的热流将湿气带进大气，而后遇冷浓缩而产生降雨.由于它对洋流和风流的影响，因此关于降雨，反照率影响是控制气候的一个基本因素.

森林覆盖率的变化对气候产生重要的影响

温带森林加速了全球气候的变暖

• 为什么森林砍伐后当地的降雨量会下降?

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