Reading notes: week 1
Reading notes: week 1 Geog 350
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This 2 page Class Notes was uploaded by Elizabeth Notetaker on Tuesday September 27, 2016. The Class Notes belongs to Geog 350 at University of Wisconsin - Eau Claire taught by Dr. Gary Running in Fall 2016. Since its upload, it has received 4 views. For similar materials see Soils in Geography at University of Wisconsin - Eau Claire.
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Date Created: 09/27/16
Soils P 9-22:, 32-52 Basic concepts: Soil morphology Varies spatially in horizontal and vertical dimensions Includes what is there but how it is also put together Soil Composition Composed of clastic particles, organic materials in different stages of decay, living organisms, water and gases within pores. Soil Texture Clastic mineral particles are divided in to <2mm diameters Geologists use the phi scale Phi scale Particles are divided based on size Sand, silt, clay is referred to as soil separates Sand Composed of primary minerals Clay size particles- secondary minerals Clay is a size fraction irrespective of mineralogy Clay mineral- is a family of phylosilicate minerals- many clays are quartz or amorphous minerals Soil texture Refers to relative proportions of sand, silt and clay, often described as “feel sample” Field example- texture is determined by rubbing a sample between thumb and forefinger Clayey soils form a ribbon Sand soils feel gritty Silt feels smooth Data on sand, silt and clay are plotted on the textural triangle Loamy textures- are not dominated by one size fraction Sand- has a clay loam texture- dominate feel of sample is given by last name Particles larger than 2 mm in diameter usually are into the textural class name Coarse fragments affect the way water moves through and is retained in the soil Saturated flow- water moves quicly through coarse-textured soils Sand-have larger pores Surface area is important because particle surfaces retain water, cations, onions, and nutrients, also aquires coatings which effects colors to soils
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