Eutrophication is when there are excessive amounts of nutrients in a lake. The effects of this are that algae will bloom (grow quickly). Having a lot of algae will mean that there is not enough oxygen for other organisms, they will also struggle to find enough light as algae covers the surface. More organisms will die then usual- more algae to die/ less oxygen and light so fish die- so decomposers will thrive; these decomposers will also use a lot of oxygen from the water. In the end there will not be enough oxygen for fish.
Nutrient get leached into rivers from soil as rain water runs off land into rivers and lakes taking nutrient with it. If fertiliser has been put in the soil then the soil will be rich in certain nutrient, especially nitrogen: so rain water runs off fertilised soil it will bring high amounts of nutrient into surrounding rivers or lakes causing eutrophication.
how can we prevent eutrophication happening?
ReplyDelete1. You can treat the sewage before it enters rivers.
Delete2. Prevent farmyard drainage entering rivers and ponds.
3. Control the use of fertilisers:
- apply only when the crops are growing
- never apply to bare fields
-do not apply when it's forecasted to rain
- don't dispose the waste fertilisers into rivers and ponds
4. Bubble a stream of air through badly polluted ponds.
5.Use biological control
Deletewe can't you dumbo
ReplyDeletelol u clearly can, there r 4 different ways above, "dumbo"
DeleteThe Biology Syllabus has changed…
ReplyDeleteHere is a New blog for the 2017 Syllabus:
http://igcse-biology-2017.blogspot.hk
more at
ReplyDeletehttp://igcse-biology-notes.blogspot.hk/2017/06/416-understand-that-eutrophication-can.html