High up in the mountains, trees and dwarf pine hold back build-ups of snow, thus preventing the formation of the avalanches, that are a common occurrence on treeless slopes when there is a thaw, leaving devastation in their wake and often taking their toll in human lives as well.
At night, conversely, they reduce the hnliation of warmth into the atmosphere. Tree belts and expanses of turf enable better penetration of water into the soil, I lie water then being returned again by them to the atmosphere in the form of vapour during the process of transpiration and evaporation. That is why the lower and the relative humidity higher in parks and tree-lined streets.
Trees with a large leaf surface are similarly efficient filters of polluted city air. Their leaves, especially if they are tomentose and covered with fine hairs, entrap large quantities of dust particles, which arc then washed off onto the ground by rain. The fact that trees and shrubs lower the speed of wind in city streets also promotes the settling of dust and the clearing of the air. Rows of trees and shrubs between traffic lanes or between street and sidewalk lower the noise of traffic by as much as 10 to 15 per, cent.
The effect of tree belts or forest areas promoting the absorption of rainwater is very well known. In a forest, even after a heavy downpour, the water soaks rapidly into the ground and does not form puddles. The chief reason behind this is the soil structure: forest litter, high humus content and the small channels left in the soil by decayed roots.
Age-old trees, whose lireading branches offered welcome shade to farmers taking a rest from their toil in the fields one or two hundred years ago, iliday offer the same welcome respite to urban man seeking elaxation in the countryside.
When we stand in awe before these giant and majestic trees, we realize that they are as much as that of a nation's cultural heritage as are outstanding buildings, paintings and sculptures, and other artistic works; and therefore, our duty and responsibility to preserve them for sterility.
At night, conversely, they reduce the hnliation of warmth into the atmosphere. Tree belts and expanses of turf enable better penetration of water into the soil, I lie water then being returned again by them to the atmosphere in the form of vapour during the process of transpiration and evaporation. That is why the lower and the relative humidity higher in parks and tree-lined streets.
Trees with a large leaf surface are similarly efficient filters of polluted city air. Their leaves, especially if they are tomentose and covered with fine hairs, entrap large quantities of dust particles, which arc then washed off onto the ground by rain. The fact that trees and shrubs lower the speed of wind in city streets also promotes the settling of dust and the clearing of the air. Rows of trees and shrubs between traffic lanes or between street and sidewalk lower the noise of traffic by as much as 10 to 15 per, cent.
The effect of tree belts or forest areas promoting the absorption of rainwater is very well known. In a forest, even after a heavy downpour, the water soaks rapidly into the ground and does not form puddles. The chief reason behind this is the soil structure: forest litter, high humus content and the small channels left in the soil by decayed roots.
Age-old trees, whose lireading branches offered welcome shade to farmers taking a rest from their toil in the fields one or two hundred years ago, iliday offer the same welcome respite to urban man seeking elaxation in the countryside.
When we stand in awe before these giant and majestic trees, we realize that they are as much as that of a nation's cultural heritage as are outstanding buildings, paintings and sculptures, and other artistic works; and therefore, our duty and responsibility to preserve them for sterility.
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It is no good garden planning to use a material which is unavailable and in general, only materials available through a local garden centre or building contracter is suggested.
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