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Nutrient Cycling and Retention (3).docx

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Department
Biology
Course
BIOLOGY 2F03
Professor
Kim Dej
Semester
Fall

Description
November 21 , 2012 Biology 2F03: Fundamental and Applied Ecology Nutrient Cycling and Retention (3) Effects of animal grazing on nutrient cycling - large grazers speed up nutrient cycling on the Serengeti ecosystem - biomass turnover refers to replacement time for the current vegetation - turnover time decreases with the intensity of grazing: production is both accelerated and consumed (transferred to animals) In fynbos: plants play a role of their own - acacia (Acacia saligna) is an introduced species - nitrogen content under acacia is much higher - why? - Consequences: change in nutrient availability will change the competitiveness of plants = change in composition Question - how do humans affect nutrient budgets Hubbard Brook experimental watershed - change in vegetation cover (clear cutting) led to different concentration of nitrogen in stream w
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