ENVS 1126 Lecture Notes - Lecture 8: Permafrost, Cellular Respiration, Acid Rain
20 Nov 2016
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Document Summary
Primary succession: primary succession: the process of initial invasion and progression from one biotic community to another. Secondary succession: secondary succession: an area cleared by some disturbance (fire, floods, humans) is reinvaded by plants and animals from surrounding areas, starts with pre-existing soil, crabgrass invades an abandoned agricultural field. Conservation, preservation, restoration: conservation of biota and ecosystem manages or regulates use so it does not exceed the capacity of the species or system to renew itself. Acid deposition: atmospheric co2 dissolves in moisture in atmosphere and in ocean to form carbonic acid. Fertilizers: npk ratios indicate the proportions of nitrogen, phosphorus, and potassium, 12-4-8 means there is 3 times more nitrogen than phosphorus, and twice as much potassium than phosphorus. Denitrification: a microbial process in soils and sediments depleted of oxygen, microbes use nitrate as a substitute for oxygen, nitrogen is reduced (it gains electrons) to nitrogen gas, released into the atmosphere, occurs in sewage treatment systems.
