Hierarchy refers to the hierarchical order of the system in structure or function. Leaf refers to a basic unit of plant community structure, which is a functional community composed of species with the same life style or similar ecological requirements. Layers are not simply layered, and each layer is composed of plants with the same life form; And some layers can be composed of several layers.

2. Different applications

Layer is used to divide the vertical genera of plant communities.

Level is used for writing skills, materials, etc. Writing level refers to the order in which the ideological content of an article is expressed. It reflects and shows the development stages of objective things and contradictions in all aspects, and it is also the concrete embodiment of the development process of the author's thinking flow.

The material itself has various connotations at different levels and can be used to express different levels of themes. The reason why materials are hierarchical is objectively due to the complexity and hierarchy of objective reality itself, and subjectively due to the deepening process of people's understanding of something from shallow to deep, from phenomenon to essence.

3. Different characteristics

Different levels have different properties and characteristics, and have the same laws, special laws and diversity.

Characteristics of lamella: Plants in the same lamella belong to the same life form category. Each floor has a certain microenvironment in the community. Each leaf has the characteristics of temporal and spatial changes. Each layer has relative independence.

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