The number of species in different communities is different, and the number of species in the community is called richness. Scientists studied the richness of woody plants in China from northeast to Hainan, and found that the closer to the tropical area, the richer the species per unit area. Species richness does not mean the number of a species, but the number of species.
Structure and horizontal structure of community
The horizontal structure refers to the mosaic distribution in the horizontal direction of the community habitat. Due to the influence of many environmental factors such as topographic relief, light and humidity in the horizontal direction, the distribution and density of biological populations in different sections are different.
Take forests for example. At the base of the tree and the position covered by other tree crowns, the light is often dark, which is suitable for the survival of shade loving plants such as bryophytes; There are more shrubs and grass in the gap under the crown and other areas with sufficient light.
vertical structure
Cause of formation: In the community, various biological populations occupy different spaces.
Concept: Vertical structure refers to the obvious stratification of the community in the vertical direction of the community habitat.