ENV100Y5 Lecture Notes - Lecture 13: Biogeochemical Cycle, Photic Zone, Water Cycle
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ENV100Y5 Full Course Notes
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Document Summary
Vegetation of the world: npp is a rate, climate change, change in precipitation. Limits to productivity in aquatic ecosystems: coastlines more productive than open ocean, depth of photic zone; nutrients, access to sediments, nutrients, runoff from surface. Substances move among these reservoirs and may take several chemical forms. Size of reservoirs and rate of cycling may vary in different ecosystems and over time. Short: rates of photosynthesis and respiration (100s of years: medium: rates of deposition and burial of organic matter (1000s of years) Long: rates of weathering, limestone formation, and plate tectonics (millions to billions of years) Aquifers: underground reservoir, recharged by precipitation and surface water flows. Human impacts on the water cycle: damming rivers -> evaporation, hard surfaces -> runoff, erosion, deforestation -> transpiration. The carbon cycle: carbon is part of all organic molecules, carbon moves out of atmosphere into biotic reservoirs via photosynthesis; from biota to atmosphere via respiration.
