BIOLOGY 2F03 Lecture Notes - Fynbos, Introduced Species
Document Summary
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. Consequences: change in nutrient availability will change the competitiveness of plants = change in composition. Hubbard brook experimental watershed change in vegetation cover (clear cutting) led to different concentration of nitrogen in stream water meaning . No matter what measures are taken, when there are more people and more technology, nitrate exports increase this nitrogen always ends up in the coastal waters and fertilizes the ocean. Human density and landscape use intensity are correlated with phosphorus exports. Summary important nutrients and elements cycle", with storages in rocks, air, oceans, or biota.
