The brightness of light is a physical quantity which is aimed at people's subjective feelings. Generally speaking, the adaptability of plants to light is better than that of shade plants. For light plant, adequate light is the normal growth conditions, the light is too strong to produce burns and even life-threatening, too weak light will hinder the normal growth. Shade plants also have a range of light intensity suitable for their growth, too high or too low light intensity is not good.
Plant adaptation to light intensity can be divided into three categories:
1) positive plants. In the strong light environment can grow, develop strong, weak light under the growth and development of poor, the pioneer plant communities are.
2) negative plants. Under the weak light, the growth is better than the strong light, the strong light is injured, so many shade ferns, orchids, etc..
3 shade tolerant plants. There are two meanings: one in full sunlight grew best, can also endure certain shade plants; the second is at a certain stage of life history (mainly seedling) need to moderate weak light. Such as Cyclobalanopsis glauca, Pinus koraiensis, seedling period is not resistant to strong light, is living in the shade of the upper layer of trees, when adults reached the top of the canopy, a positive plant.
In fact, the plant of light to adapt to the change of light. Under the weak light, the spectral component and the whole day has the obvious difference, under the forest is suitable for the photosynthesis light ingredient from top to bottom gradually absorbs and reduces, often to the ground near the green light.
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