The flux of energy irradiated by the sun is essential to the earth’s life. The sun is the source of energy for photosynthesis and it is very important to regulate the vegetable’s life. The present paper is about the solar radiation influence on the dynamics of the forest. Thus, first it was made a brief explanation about the species, classification in ecological groups.The objective was to learn about the solar radiation influence on the inside of forest at differents stages and at the clearing formation. In order to understand the radiation effect starting on the seed germination until the structuring and flora composition of forest
