Effects on ecosystem - air pollutants, Biology

Assignment Help:

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.


Related Discussions:- Effects on ecosystem - air pollutants

Maintenance and regulation of peripheral circulation, Maintenance and Regul...

Maintenance and Regulation of Peripheral Circulation Pressure receptors (baroreceptors) located in the wall of the internal carotid arteries and in the arch of aorta, when

Johne’s disease, Johne’s disease The disease, discovered by Heinrich A....

Johne’s disease The disease, discovered by Heinrich A. Johne, a German bacteriologist and veterinarian, in 1905, is caused by a bacterium named Mycobacterium avium subspecies p

Define factors that affect the requirement of protein, Define Factors that ...

Define Factors that affect the requirement of Protein? Protein requirement is greatly influenced by many factors such as age, environmental temperature, energy intake, gender,

How inadequate breast milk cause protein energy malnutrition, How Inadequat...

How Inadequate Breast Milk cause protein energy malnutrition? Though prolonged breastfeeding of children is the rule in US, the amount of breast milk secreted in poor Indian mo

What do you mean by sampling?, Question 1 Explain the essential elements o...

Question 1 Explain the essential elements of Pharmaceutical Manufacturing Question 2 What is pharmacokinetics? Briefly describe the different pharmacokinetic processes that d

What is the significance of protein for the cell, Q. How does the sodium-po...

Q. How does the sodium-potassium pump present in the cell membrane work? What is the significance of this protein for the cell? The sodium-potassium pump is the transport prote

Tricuspid valve replacement, Tricuspid Valve Replacement :  It is don...

Tricuspid Valve Replacement :  It is done for organic tricuspid valve disease and at times for functional tricuspid I regurgitation. When done along with other procedures, it

Define the symptoms in bone marrow of pernicious anaemia, Define the sympto...

Define the symptoms in Bone marrow of pernicious anaemia? The nucleated red cells of the marrow are greatly increased.  The successive nucleated cell stages in erythropoiesis a

Can you explain myopia and hypermetropia, Q. How can the visual deficiencie...

Q. How can the visual deficiencies known as myopia and hypermetropia be optically explained? Myopia is the visual condition in which the images are formed previous to (in front

Plasmid, Plasmid  is the class of the circular, extrachromosomal, autonomou...

Plasmid  is the class of the circular, extrachromosomal, autonomously replicating, DNA elements found in number of bacteria. Contain origins of the replication to ensure their main

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd