What is the first stage of forest succession?

1. The first stage of forest succession is the grass, or plant stage.
2. It occurs after land has been cleared due to natural events or otherwise. 
3. The sudden clearing of the land floods the ground with sunlight.
4. Due to which very shade-intolerant pioneer species like long-leaf pine, aspen, or cottonwood begin to compete with grasses.
5. At this stage, these trees are mere seedlings in their life, but pioneer species are typically fast growers.

Further Readings – 

1. Species in News
2. Alien Invasive Species 
3. Weather, Climate And Climate Change