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1. SULPHUR CYCLE
Name:- Subhashree Sarangi
Abhilipsha Das
Branch:- M.Sc. Zoology
School:- School of Applied Sciences
Regd.no. :- 220705180070
220705180071
Guided by:- Dr. Bikash Sahu

2. Introduction
Process of sulphur cycle
Role of micro organisms in sulphur cycle
Conclusion
References
Acknowledgement
CONTENTS:-

3. • The sulfur cycle is a biogeochemical cycle in which
the sulfur moves between rocks, waterways and
living systems.
• The sulfur cycle is made up of 4 steps:
mineralization, oxidation, reduction and
incorporation. Sulfur is one of the main
constituents of many proteins, vitamins and
hormones.
INTRODUCTION:-

4. PROCESS OF SULPHUR CYCLE
THROUGH VARIOUS STAGES :
Fig 1: Sulphur cycle (Source internet)

5. ATMOSPHERE:-
Sulphur dioxide is the primary source of
sulphur in the atmosphere it is found due to:
human activities such as combustion of
fuels.
Volcanic activity increases sulphur dioxide
 Hydrogen Sulphide gas mostly released by the
action of micro organisms on dead and
decaying organic matter ,this decomposition
results in hydrogen sulphide formation.
This hydrogen sulphide later oxides to form
sulphur dioxide in air.

6.  The sulphur then enters the biosphere either through the
weathering of rocks or through the atmosphere.
Sulphur present in the atmosphere aids in the formation of
clouds by increasing the count of cloud droplets as well as
increasing the size of the droplet. Sulphur thus dissolves in the
rainwater forming weak sulphuric acid droplets and reaches the
biosphere.
The process of paedogenesis, chemical weathering causes
sulphur to move to soil and water from the rocks. Some sulphur
gets converted into sulphate and is released into the air in the
process of weathering.
BIOSPHERE:-

7. UPTAKE BY LIVING ORGANISMS:-
As the sulphur gets transported to the soil and the oceans, it
becomes available for consumption by microorganisms,
animals and plants.
Sulphur is taken up by the green sulphur bacteria that utilize
it as a form of energy.
Plants absorb sulphur from the soil by means of their roots.
Several microorganisms present in the soil also contribute to
making sulphur for absorption by plants.
Sulphur consumed is utilized for the formation of
biomolecules such as nucleotides and proteins in living
organisms.

8. RELEASE:-
This is the final step in the sulphur cycle process.
sulphur which is present in the biosphere travels through
the food chain by means of consumers feeding on
producers and then ultimately reaching the decomposers.
This sulphur through the process of decomposition gets
converted into sulphides from the sulphate form and is
released back into the atmosphere.

9. ROLE OF AQUATIC MICROORGANISMS IN
SULPHUR CYCLE:-
Fig 2;Role of aquatic micro organisms in sulphur cycle (Source internet)

10. ROLE OF MICROORGANISMS IN
AQUATIC BODIES:-
Fig 3; Role of micro organisms in aquatic bodies
(Source internet)

11. CONCLUSION:-
• The sulfur cycle is of general importance due to its
involvement in the anaerobic mineralization of organic
matter, and therefore, tight coupling to the carbon
cycle.

12. REFERENCES:-
• Bickle, MJ., Alt, JC., Teagle, DA (1994). "Sulfur transport and sulphur
isotope fractionations in ocean floor hydrothermal systems".
Mineralogical Magazine. 58A (1): 88–89.
• Aharon, P., Fu, B (2000). "Microbial sulfate reduction rates and sulfur and
oxygen isotope fractionations at oil and gas seeps in deepwater Gulf of
Mexico". Geochimica et Cosmochimica Acta. 64 (2): 233–246.
• Glossary, United States: NASA Earth Observatory, acid rain, archived from
the original on December 13, 2011, retrieved February 15, 2013.

13. ACKNOWLEDGEMENT:-
Specialthanks toMySubject teacher, Dr. BikashSahu School ofApplied
Sciences ,CUTM, Bhubaneswar.Allthefacultymembers ofDepartmentof
Zoology, School of AppliedScience, CUTM, Bhubaneswar.