Environmental Science 1021F/G Study Guide - Final Guide: Smog, Shelterwood Cutting, Soil Salinity
29 Aug 2016
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Problems (most are with fish farming): high waste concentration, food requirement, eutrophication, habitat destruction, species entanglement, gmo escape: eutrophication: loss or reduction of oxygen in the water due to high levels of nutrients. Solutions: sustainable aquaculture practices, aquaponics: aquaponics: mimic what happens in natural systems. Land degradation: natural or human processes that decrease future ability of land to support crops, livestock, wild species. 30-40% of world"s agricultural land is degraded examples of land degradation: soil erosion, desertification, soil salinization, waterlogging degradation: overusing something past its sustainable yield. Sustainable yield: rate at which a resource can be used to ensure it is not degraded or depleted so it does not become unusable for future generations. Regions with high rainfall experience water erosion (maritimes, bc, on), effects runoff and water quality. Desertification: results in decrease in production potential. Causes: overgrazing, deforestation, erosion, salinization, soil compaction, climate change. Salinization: accumulation of salt deposits left on soil surface from evaporating water.
