Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Human Impact on the Phosphorus Cycle
Like other biogeochemical cycles, human activities have altered the phosphorus cycle. Human beings mine phosphate rocks and guano deposits to make phosphorus available for production of fertilisers, detergents, animal feed, medicines, pesticide: and numerous other products. This mining exposes phosphate deposits made over millions of years. Phosphates are removed from soil through cropping of vegetation and to replace it phosphate fertilisers have to be added. Because of the abundance of calcium, iron and aluminium in the soil much of the phosphates get immobilised as insoluble salts. Thus more fertilisers have to be added. This results in high concentration of phosphates in agricultural runoffs. Similarly concentration of phosphorus in detergents, wastes of food processing plants, animal feed lot, sewage, etc., add to a considerable quantity of phosphorus poured in natural waters.
This problem becomes acute in urban areas. As said earlier, in aquatic ecosystems the phosphorus is taken up rapidly by the vegetation resulting in a sudden explosive growth of algae. Like nitrogen, this leads to cultural eutrophication of the water body. The producers cloud the water and forms a scum on the surface, blocking sunlight for the submerged plants. This is one example of the result of accumulation of nutrients at one stage of the nutrient cycle. It is important to note that the means of returning phosphorus to the cycle are inadequate to compensate for the loss. Sea birds have traditionally played-an important part in returning phosphorus to the cycle via their droppings (for example guano deposits off the coast of Peru) but apparently not at the rate at which it has occurred in the past. Unfortunately human activities appear to hasten the rate at which phosphorus is lost and thus make the cycle 'less perfect'. You could think our present use of phosphorus which is washed out into the rivers and finally into the oceans as an accelerated 'pouring' of phosphorus from the source to the sink.
What is Cardiac Transplantation ? Cardiac Transplantation : The first successful clinical heart transplant was done by Christian Bmnard at Cape Town in South Africa in 196
Stability studies are req. for the product stable at their desire time as per specification , which give the expiry date and quality as per the manner.
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
multiple choice question
Q. What is the chemical equation of the aerobic cellular respiration? The chemical equation of the aerobic cellular respiration is given below: C 6 H 12 O 6 + 6 O 2 + 36 A
How does the circulatory system participate in the functioning of the endocrine system? The circulatory system is fundamental for the performance of the endocrine system. The b
Define Types of Root Canal Perforations According to location According to location (level) in relation to crestal bone): Coronal perforation: (supragingival) coronal to
In cats, curled ears (Cu) results from an allele that is dominant over an allele for normal ears (cu). Black colour results from an independently assorting allele (G) that is domin
Figure shows the flow of energy through the trees in a forest ecosystem.The numbers represent inputs and outputs of energy in kilojoules per m 2 per year. (a) (i) On Figure,
Could you survive on a diet which contained no carbohydrate? It should be possible to survive without carbohydrate as energy can be obtained from fats and proteins.
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd