GGR227H5 Lecture Notes - Lecture 7: Global Warming, Heavy Metals, Hectare
Document Summary
Large inflow is associated with large algae blooms. Global warming lead to more severe oxygen depletion. Acid deposition is defined as deposition (rainfall, snow, fog and dry deposition from dust) that is more acidic than ph value of 5. 6. Caused by human interference with nitrogen and sulfur cycles. Human activities account for more than 90 percent of the sulphur dioxide and nitrogen oxide emissions in north america: sulfur-containing coal burning, smelting of metal ores. Trees began to die around emission sources, such as at trail, bc and sudbury, ontario. Once in the soil, the acids leach away the nutrients required for plant growth, leading to nutrient deficiency. Changes in calcium-to-aluminum ratios caused by increased acidity influenced the succession of mycorrhizal fungi on tree root systems. The actual physical contact of the acids with the plant roots can also inhibit growth and lower resistance to disease.
