Effects on ecosystem - air pollutants, Biology

Effects on Ecosystem - Air pollutants

The effects of pollutants on ecosystem become visible after a long period of exposure. In highly industrialised countries the vegetation has been exposed to pollutants for several years. Consequently their devastating effects on terrestrial and aquatic ecosystem has long been observed. These are mainly due to wet (acids like sulphuric and nitric acid dissolved in water) or dry (gases affecting directly vegetation and soil) deposition of acid in combination with other air pollutants such as 03, hydrogen flouride (HF) and particulates. Acid rain is defined as the precipitation of water in the form of rain or snow that possesses a pH between 3.7 and 3.0.

Some of the trees are covered with lichens and the fruiting bodies of decomposers. The condition of trees is quite frightening. The forest floor is covered with dry brittle, pealing branches of uprooted trees. Trees such as spruce, pine, birch, ash, alder, maple and oak are among the dead. In 1985, the cost of forest death in Germany was estimated at $1 billion. A long-term reduction in radial growth of many kinds of trees is observed in United States. The most severely affected forests were located on the windward slope of mountains enshrouded in cloud or fog and had been under stress for some time. The damage caused are due to ozone and other photochemical oxidants, sulphur dioxide, deposition of nitrogen compounds, acid precipitation, heavy metal deposition and organic chemicals. In the previous section we have already explained how air pollutants affect plants directly or indirectly by changing nutrient status of the soil. However, our understanding of the acid rain phenomena and its ecological effect is fragmentary. Acid rain affects yield, resistance and species diversity of terrestrial ecosystem.

Posted Date: 1/21/2013 4:35:27 AM | Location : United States







Related Discussions:- Effects on ecosystem - air pollutants, Assignment Help, Ask Question on Effects on ecosystem - air pollutants, Get Answer, Expert's Help, Effects on ecosystem - air pollutants Discussions

Write discussion on Effects on ecosystem - air pollutants
Your posts are moderated
Related Questions
Figure  shows part of a DNA molecule (a) (i) What do the dotted lines in Figure represent?  (ii) Name J to M. J.............................. K..............................

Explain Serum lipoprotiens Serum lipoprotiens:- spherical  or  ellipsoidal  particles containing  proteins, cholesterol esters  and  triacylglycerols, encased  within  a mon

What are food hydrocolloids? Food hydrocolloids are hydrophilic polymers of vegetable, animal, microbial or synthetic origin that generally contain many hydroxyl groups and ma

help me in writing assignment on racemization,mutarotation.

Q What is the radula? What is the function of this organ? Some molluscs have a tongue-like structure with harsh saliences similar to small teeth. This structure is called as ra

Which of the following are true for ventilation? A. The problems with ventilation induced by injection of curare occur because of the drug's direct action on nicotinic ACh Rec

We now understand that mutations that cause the inhibition of apoptosis are found in tumours. Because proliferation itself is not induced by the inhibition of apoptosis, explain ho

PAEDIATRIC NURSING   Parent education, family health promotion and health maintenance have been the concern of yesterday's and today's nurses. Florence Nightingale over a hu

Prophylaxis   High-risk neutropenic patients, such as those undergoing allogeneic and certain autologous stem cell transplants, and those with hematologic malignancy who are exp

Infectious bovine rhinotracheitis (IBR) The disease is caused by a Bovine Herpesvirus -I belonging to the family Herpesviridae and subfamily Alphaherpesvirinae. It is a DNA vi