These slides includes brief content on the introduction, types and disturbances of biogeochemical cycles occurring on land

1. Introduction

2. What is a biogeochemical cycle?
The cycling of chemical elements required
by life between living and non-living part
of environment is called biogeochemical
cycle.

4. The examples of elements are;
 Carbon
 Nitrogen
 Oxygen
 Phosphorus
 Sulfur
 Water
o
o
All these elements are macro-elements.
Other chemical elements in the cycle which are
formed as intermediates can be microelements.

5. 
These elements are cycled through;
Gas
cycle
Sediment
cycle
Sediment
+ Gas
cycle
• Carbon
• Nitrogen
• Oxygen
• Phosphorus
• Sulfur
• Water

6. BIOLOGICAL
BIOGEOCHEMICAL
CYCLE
GEOLOGICAL
CHEMICAL

7. The duration of cycle depends upon;
 Chemical reactivity of the substance
 Chemical state of substance
Important biogeochemical cycles are;
 Carbon cycle
 Nitrogen cycle
 Oxygen cycle
 Phosphorus cycle
 Sulfur cycle
 Water cycle

8. We need biogeochemical cycles
Storage of key elements
 Transport of key elements
 To make the key elements available for
organisms
 To balance the ecosystem
 Recycle the energy


9. Causes of disturbance of
biogeochemical cycles

o
o
o
o
o


Human activities:
Burning of coal
Pollution
Deforestation
Vegetation defoliation
Wastage of non-renewable sources
Depletion of natural sources
Global warming

10. The need of the hour is that we
must try to reduce the harmful
activities to protect the LIFE..