EES 140 Lecture Notes - Lecture 4: Aridisol, Nitrogen Cycle, Pedogenesis
Document Summary
Lecture 4: pahoehoe - smooth lava flows, sometimes ropey; has trapped gases, a"a - rocky features, very sharp (can cut through shoe if walked on); has more trapped gas then pahoehoe, example pics: State factors continued from last lec: new terms: Spodosal - rich in aluminum oxide and organic matter. Gleying - a wetland soil, saturated with groundwater. Histosol - soil with a deep layer of organic material. Aridisol - soil with very little organic material. Pedoturbation - mixing between soil horizons: 4th state factor: biology. Development of structure: plate structure, rocky. Diagram on slide w/ two trees: depth of organic matter = type of organic matter input, <40% = organic soil horizon, >40% = mineral soil horizon, thickness of o horizon. This allows organic acid to weather: calcium in top layers -> ph -> weathering. Affects litter content: calcium in lower layers -> ph.