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
Define tracheal system in details. Respiratory system found in insects and some spiders where air passes directly to the tissues through a series of tubules. Since oxygen tran

Influence of Yolk on Cleavage Though biological significance of yolk is to provide nourishment to the developing embryo, it is not part of the active cytoplasm. Yolk is dead

(a)   For any individual :                  ·          We should check house, doors and windows and have them repaired whenever necessary.                  ·          We shou

Q. What are the major features of fishes associated to the habitat where they live? Fishes are all aquatic animals and thus they have a hydrodynamic elongated body appropriate

Ancestral Unicellular Organism So far in this unit we have considered the characteristic of body designs that are shared by various animals and the different body plans that d


What is gluconeogenesis There is accumulation of lactate, which is released into the blood and taken up by  the liver where  it  is converted to glucose by  the  process called

Adverse Effects of Imiquimod Application site reactions (irritation, pruritus, flaking, erosion) are generally mild to moderate in intensity and resolve within 2 weeks of cessa

Define Energy requirements of infants? Energy: Energy requirements of infants are based on the energy intake through breast milk by infants of well-nourished mothers. Based on

Chromosome partitioning depends on changes in the polymerization state of bacterial proteins that are functionally analogous to what eukaryotic protein?