Showing posts with label Acid precipitation. Show all posts
Showing posts with label Acid precipitation. Show all posts

Thursday, September 19, 2013

Steps To Prevent Acid Rain

Acid rain is caused by air pollutants such as sulphur dioxide or nitrogen oxide. These chemicals are produced by the burning of fossil fuels, the smelting of ore, the burning of coal, and the processing of natural gas. Then the chemicals can travel long distances by wind, mix with precipitation, and fall on the earth, causing damage to plants, animals, and our health. Electric companies and other industries that burn coal produce sulphur dioxide, and the main cause of nitrogen oxide is vehicles and fossil fuels.

One side of prevention is government environmental regulations, to limit the quantity of emissions released into the atmosphere. To follow these regulations, industries can add “scrubbers” to their smoke stacks to reduce the amount of sulphur released. Another option is washing the coal before it is burned, which reduces the amount of sulphur in the coal. To reduce the amount of car exhaust pollution, catalytic converters can be used in vehicles to make the exhaust less harmless.

On a more personal level, there are many things you can do to help prevent acid rain. Try to use your car as little as possible: walk, use public transportation, and carpool. Turn the heat down in your house, and don’t use air conditioning (these things require more gas burning). Conserve water by running a washing machine or dishwasher only with a full load. And remember to turn off lights, and use energy efficient lightbulbs! By following these tips, you will reduce the emissions of fossil fuels by using less energy. If we all pitch in and do our part, we can improve our quality of life and the beautiful earth on which we live.
 

Monday, September 2, 2013

Effect of Acid rain on vegetation

Many scientists now believe that the direct and indirect impacts of acid deposition on vegetation are substantive, whether these effects are measured in a biological or an economic context.The growth rate of spruce trees in the Green Mountains of Vermont declined by 50% between 1963 and 1973.Tree ring analysis suggests similar reductions in forest growth in Europe. Acid precipitation has been implicated in these declines, but unambiguous cause effect relationships are lacking. 

Factors

In addition to the extent of acid deposition (concentration or total deposition), the response of plants to acid deposition will depend on a number of factors including:
  • Plant species, ecotype or cultivar.
  • Plant age or stage of development.
  • Characteristics of exposure (frequency, duration, period, form of acidity, time between exposures, and others).
  • Other environmental factors that affect plant vigour.
  • Buffering capacity/sensitivity.
  • To address these challenges, many scientists have resorted to research in controlled environments such as greenhouses or growth chambers, using simulated acid precipitation.

Direct effects of acid precipitation on plants:

The acid rain affects the crops as well as the vegetation. The effect of acid rain on plants is grave. It not only damages the root, but also stops its growth and brings an end to the life of a plant. The nutritive value of the soil is reduced to a great extent as an effect of acid rain. Acid rain effects can be seen on the useful micro organisms which convert the decayed organic matter into essential nutrients for the soil. The consequence is that the micro organisms are killed resulting in reducing the availability of nutrients for the soil and plants. Also, the waxy layer of the leaves is damaged which make the plant more and more susceptible to diseases.

The havoc done by acid rain is not localised in the place where it is caused. The atmospheric emissions may travel for several days and over long distances depending upon wind and climatic conditions, before coming down as acid rain. The problem caused in an industrialised area may therefore result in acid rain in the surrounding forests or lakes, or even further away. It is believed that around 50% of the acid rain that occurs in Canada is due to pollution caused in the United States of America, and the effect of polluting industries in England can be felt in Norway