Forest canopy density refers to the ratio of vertical projection area of crown to forest area of woodland. The interception effect of forest on snowfall is mainly affected by canopy density and stand factors (tree height, DBH, forest age, density, etc.). ).
There are horizontal canopy density and vertical canopy density. Horizontal canopy density refers to the leisure degree of a forest layer. Pure forests or single-layer forests of the same age often form horizontal canopy density. Vertical canopy density refers to the canopy density produced by two or more forest layers in the vertical direction.
Extended data:
Other indicators closely related to canopy density:
1. Forest coverage rate: refers to the percentage of forest area to land area in a certain administrative area. Forest area refers to the area of arbor forest land and bamboo forest with canopy density above 0.2, shrub land specially stipulated by the state, and the coverage area of farmland forest network, trees beside villages, roadsides, water surfaces and houses.
2. Crown coverage: the percentage of the sum of the crown areas in the region to the regional land area.
3. Green coverage: divided into urban green coverage and urban built-up area green coverage. The percentage of urban greening area to the total urban area is urban greening coverage rate; The green coverage rate of urban built-up area is the percentage of the green coverage area of urban built-up area. Green coverage area refers to the vertical projection area of all vegetation such as trees, shrubs and lawns in the city.
4. Tree greening rate: refers to the percentage of the sum of forest land area, shrub land area (including shrub land and other shrub land areas specially stipulated by the state), farmland forest network and surrounding trees (beside villages, roadsides, waters, houses, etc.) in the total land area. It is an economic and technical index to measure the greening of trees in a certain administrative area.
Baidu encyclopedia-canopy density