Lecture 7 Biogeochemical cycles.ppt

Lecture 7 Biogeochemical cycles.ppt - Lecture-7...

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Lecture-7: Biogeochemical Cycles Course Instructor: Md Asif Rahman (ASR) Lecturer, Department of Mathematics and Natural Sciences (MNS) University Building 2 (15 th Floor) E-mail: [email protected]
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Biogeochemical cycles/Nutrient cycles: All organisms are interconnected by vast global recycling systems known as nutrient cycles ,or biogeochemical cycles A biogeochemical cycle is a complete path that a chemical substance ররাসরায়ননিক পদরারর takes through the four major components of earth’s system: atmosphere, hydrosphere (ocean, rivers, lakes, groundwater and glaciers), lithosphere (rock and soil) and biosphere (plants and animals). A biogeochemical cycle is a chemical because chemicals are cycled, bio because the cycle involves life and geo because a cycle may include atmosphere, water, rocks and soils. Within these cycles, reservoirs or pools are where the particular nutrient is stored.
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The Importance of studying biogeochemical cycles Understanding the sources of the nutrient elements and gaining a better understanding of the biological, chemical and physical factors regulating them. Improve understanding of the interactions among the various biogeochemical cycles. Assessing পনরমরাপনি anthropogenic এনপজজননিক * মনি নষষ disturbances in biogeochemical cycles and their impacts on ecosystem functioning, atmospheric chemistry, and human activities. Developing a scientific basis for decision making about managing these cycles. Exploring technical and institutional approaches to managing man’s disturbances to the cycles.
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Any element (chemical substance ররাসরায়ননিক পদরারর ) that an organism needs to complete its lifecycle is called a nutrient.
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