为什么没有闪电就没有植物（为什么只有闪电没有雷声）

这里有好几层含义。

1，lightning（闪电）产生时，能够空气中的氮气与氧气发生反应，就象“五行缺土”说的:

N2+O2=2NO (高压放电)

2NO+O2=NO2

4NO2+O2+2H2O（水蒸气）=4HNO3

HNO3随雨水落下与土壤中的盐类混合生成硝酸盐，也就是植物生长所需的氮肥。

植物无法从空气中汲取游离氮，只能从土壤中吸收硝态氮或氨态氮。

2，原始地球生命演化需要lightning（闪电），这样才能有形成小分子有机物，再形成大分子有机物，最终能够演化为原始生命，才有可能有现在的植物。

等等。

应该是光照吧，植物不都进行光合作用吗，依赖于光把空气土壤中的无机物转化为有机物来供自己生长。

The reason relies in that, the plants need light for photosynthesis to gain energy for their growth. In this process, under the help by light, the plants convert the minerals from the air and soil to the organics as the energy source.

参考：

Photosynthesis is a process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. Photosynthesis occurs in plants, algae, and many species of bacteria, but not in archaea.Photosynthesis is vital for all aerobic life on Earth. As well as maintaining the normal level of oxygen in the atmosphere, nearly all life either depends on it directly as a source of energy, or indirectly as the ultimate source of the energy in their food

闪电后下的雷雨，含有丰富的氮肥。氮肥是植物生长不可缺少的元素。

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