BIOL 317 1st Edition Lecture 3 Outline of Last Lecture - Ecology Outline of Current Lecture - Soil Current Lecture- Ecologists Ecology - True science - Is a diverse science - Many ways to study ecology Environmental Science - True science - Sub-discipline of Ecology - Man’s impact on nature Environmentalism- Not true - Incorporates aesthetics and values Average depth of ocean is 4000 meters Terrestrial Ecosystems Soils - Foundation of terrestrial environment - Is a complex mixture of living and non-living material upon which terrestrial life depends o Medium for plant growth o Recycling system for nutrients and organic wastes o System for water supply and purification o Engineering medium o Habitat for organisms- O horizon o Organic horizon, upper layer contains loose fragmented plant litter- A horizon o First mineral layer containing sand, silt, and clay, mixed In with organic material (top soil)- E horizon o Zone of eluviation, zone of maximum leeching, light in color and as it rains water moves down and picks up organic - B horizon o Zone of illuviation, zone of maximum accumulation, has banding patterns - C horizon o Minimally weathered and fragmented but not highly weathered - R horizon o Bedrock Pedogenisis- Study of soil layers CORPT- Climate - Organisms - Relief - topographical relief, where the soil forms - Parent material - geological or precursors of soil -