What does the crown mean?
The aboveground part of a tree is composed of leaves such as trunk (tree), main branches, lateral branches, fruiting branches and new shoots, which are shaped like a crown, so it is called a crown. The part from the root neck to the first main branch (the first main branch if there is no main branch) is called the trunk, and the part above the trunk is called the crown.
From the tree structure, the crown is mainly composed of main branches and auxiliary branches. The permanent branches that make up the crown skeleton are called main branches, including central trunk, main branch and side branches. The permanent big branch extending upright from the trunk and located in the center of the crown is called the central trunk; The central trunk of dense planting is very small, similar to a big main branch, and it is in the central position.
The crown of the tree is generally like a hemisphere, and some are spherical. Such as perennial willow, the crown is spherical, and it is called "steamed bread willow".
Extended data:
Crown is the main body of photosynthesis of trees, and the utilization of environmental factors such as solar radiation by trees is limited by crown structure and spatial distribution characteristics. Its shape is influenced by hormones, wind and other external forces, artificial pruning, growth environment, soil pH, temperature difference between day and night, etc.
Crown shapes can be roughly divided into three types: natural shape, flat shape (hedge shape, hedge shape) and horizontal shape (scaffold shape, disc shape, creeping shape). In solving the contradiction between close planting and light energy utilization, close planting and operation, flat shape is the best. The population effective volume and crown surface area are the largest in the flat shape, followed by the natural shape and the smallest in the horizontal shape.
Canopy provides nutrients for trees by completing photosynthesis; For wild animals such as macaques, provide space for activities under trees; For human beings, it can provide building materials, prevent waves and sandstorms, beautify and purify the environment, and make oxygen.
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