English report- tree damage1

English report- tree damage1 - Latvia University of...

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Latvia University of Agriculture Faculty of Social Sciences Department of Languages Report Tree damages Written by: Andris Tiļugs ……………………………. ./ A.Tiļugs / 2 nd year student, Faculty of Forest Lecture: Mgr. paed. Dace Skrupska ………………………/ D. Skrupska / Jelgava 2011
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Content Introduction Our trees are subjected to influence by a wide number of factors. Trees compete with each other and with other plants for nutrition and water. They also provide food or the culture medium for animals and fungi. Trees can also be attacked by viruses and bacteria. Finally trees can live under climatic conditions which are more or less favourable. 2
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The condition listed above may be considered to be natural conditions, in which both tree and the assailant have to some extent adapted to each other. But the onset of the industrial revolution changed the situation, by bringing substances harmful for trees and the soil out into the countryside. Damage to trees can this occur for a large number of different reasons by forest damage we mean that the damage is extensive, regardless of what the cause is. A certain number of damaged trees may be regarded as natural. Forest damage real definition is when forest damage is reduction of tree population in forests caused by acidic precipitation, forest fires, air pollution, deforestation, pests and diseases of trees and wildlife. Climate damage The most serious climatic damage is caused by storms and the weight of snow (snow break). A combination of these two forms of damage can be particular serious, also serious damage is frost which can damage a lot of little trees. Hailstorms which can take the needles off the new shoots of pines at the beginning of the growing seasons are unusual but can occur. The last storms in Latvia destroy 4200 ha forests 3
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lands and 220 000 cm3 trees drop down. To remove storm damage specialists must work quickly, because they can get some profit, comparatively when timber will be located in the forest some time. Constitutive problem is acid rain which is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). It has harmful effects on plants, forests, aquatic animals, and infrastructure through the process of wet deposition. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxides which react with the water molecules in the atmosphere to produce acids. Acid rain weakness trees and their resistance decrease. Acid rain can to get in leaves and needles where they started damaged that. Most damage gets coniferous trees, because their needles live 6-8 year and acid rain damaged more and more. Acid rain affects trees dependence on the growing place. Soil has a lot of nutrients but also soil has bad metals which they get from acid rain
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English report- tree damage1 - Latvia University of...

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