Even though the process of civilization has made man independent of nature and raised him to a higher level, yet he is continually aware of the fundamental influence of nature on generations of mankind.
Trees and shrubs are also differentiated according to height. Small trees attain, a height of about eight metres, those of the second category fifteen to twenty-four metres, and those of the first category more than twenty-five metres. The thickness of a tree is usually given by the diameter of the trunk measured at breast height, i.e. 1.3 metres above ground.
The forest provided primitive man with food, fuel and building material, affording him also protection against enemies and the elements. To realize the importance of trees and forests for man, however, there is no need to go so far back into the past. Even our great-grandfathers could say that trees and their wood were man's companions from birth to death - from wooden cradle to wooden coffin. Man used wood to build houses and make furniture, construct household utensils, tools and vehicles, and shape primitive weapons. Until almost the eighteenth century wood was also the only source of heat and energy.
Today, metals, ceramics and plastics made by chemical processes have in many instances replaced wood. But wood's importance and consumption throughout the world is not declining, quite the contrary. Every year the wood from our trees and forests gives us millions of tons of paper.
The value of forests and trees, 'however, does not rest only in the timber they yield. Man is beginning to realize with ever- growing awareness the other functions of the forest And its vegetation. Today we know how important trees and forests are in water management and in preventing soil erosion And the importance of parks and woodlands for man's health and recreation cannot be over-stressed.
Broad-leaved trees grown under the same conditions have a short, thick trunk with a broad, low-placed crown. Only certain light-demanding trees such as the pine, larch, birch and aspen, have the lower half of the bole clear of branches and the crown placed high even when grown in the open.
Trees and shrubs are also differentiated according to height. Small trees attain, a height of about eight metres, those of the second category fifteen to twenty-four metres, and those of the first category more than twenty-five metres. The thickness of a tree is usually given by the diameter of the trunk measured at breast height, i.e. 1.3 metres above ground.
The forest provided primitive man with food, fuel and building material, affording him also protection against enemies and the elements. To realize the importance of trees and forests for man, however, there is no need to go so far back into the past. Even our great-grandfathers could say that trees and their wood were man's companions from birth to death - from wooden cradle to wooden coffin. Man used wood to build houses and make furniture, construct household utensils, tools and vehicles, and shape primitive weapons. Until almost the eighteenth century wood was also the only source of heat and energy.
Today, metals, ceramics and plastics made by chemical processes have in many instances replaced wood. But wood's importance and consumption throughout the world is not declining, quite the contrary. Every year the wood from our trees and forests gives us millions of tons of paper.
The value of forests and trees, 'however, does not rest only in the timber they yield. Man is beginning to realize with ever- growing awareness the other functions of the forest And its vegetation. Today we know how important trees and forests are in water management and in preventing soil erosion And the importance of parks and woodlands for man's health and recreation cannot be over-stressed.
Broad-leaved trees grown under the same conditions have a short, thick trunk with a broad, low-placed crown. Only certain light-demanding trees such as the pine, larch, birch and aspen, have the lower half of the bole clear of branches and the crown placed high even when grown in the open.
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Garden planning of a garden for children should be designed to convert easily to a decorative layout.
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