Canopy structure means: (1) the whole of the vegetation community including species, number, leaf area, and leaf history; (2) its spatial organization, horizontal and vertical arrangement; and (3) its time progression (season, year, decade, and more). Then geometric complexities of different canopies are reduced to a simple quantification of the sum of all leaf layers as LAI.
The vertical distribution of LAI in mixed canopies reflects the functional abilities of species or leaves (shade, air humidity, and temperature tolerance). LAI controls both within- and below-canopy microclimate, determines and controls rainfall, snow and deposition interception, radiation extinction, wind velocity slackening, light quality and quantity below the canopy, and hence influences the living conditions of fungi, plants, insects, macro- and micro-fauna communities.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.