GEOG 120 Lecture Notes - Lecture 2: Soil Acidification, Greenhouse Gas, Soil Fertility
5 Feb 2019
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Document Summary
Recognizes interactions and feedbacks among the atmosphere, hydrosphere, geosphere, and biosphere. Two major sources of co2 emissions from human activities. Cycling of chemical elements (gases, solids, and liquids) required for life between biotic and abiotic components of the environment. Changing the amount of elements in different reservoirs. And the rate of flow among reservoirs. Able to add new sources and fluxes. Environmental pollution, ocean and soil acidification, eutrophication, global warming. Soil fertility, agriculture, industry, human health, ecosystem health, biodiversity on land and oceans. Methane production in the absence of oxygen. Overall trend of rising co2 in the atmosphere. Seasonal fluctuations in co2 uptake (photosynthesis) and co2 release (respiration) Greater seasonality in co2 fluxes in nh because more land plants. Greater seasonality moving north away from equator. Less seasonality in sh because most co2 from marine photosynthesis and respiration stays dissolved in ocean. Deforestation, grassland conversion, agriculture, peatland drainage, fire. Cattle, waste management, rice paddies, biomass burning.
