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Chapter 11- Soil-Foundation for land ecosystems, Soil and Plants, Soil…
Chapter 11- Soil-Foundation for land ecosystems
Functions
recycles nutrients and water
purifies water
habitat for organims
modifies atmosphere
supports plant growth
Composition/Properties
25% air
45% minerals
25% water
5% organic matter
must hold oxygen for plants
must hold nutrients for plants
must hold water for plants
must lave low salt so it doesnt kill plants
need neutral pH
Topography - movement of water and soil
Physical/chemical weathering of rocks (igneous, sedimentary, metamorphic)
Biota -plants and animals living in soil
Time - needed for rocks to weather and become soil
Climate - most important
temperature
precipitation
Soil particles
Silt
Clay
Sand
Soil color
oxisols - red means has oxidized iron in it
inceptisols-gray from materials leached out
dark means rich with organic matter
histosols - dark brown from organic matter, found in wetlands
Spodosols - gray, brown and orange -found in pinelands
Soil and Plants
Soil Forming factors