ENVIRSC 2B03 Lecture Notes - Lecture 16: Soil Classification, Regosol, Cation-Exchange Capacity
7 Feb 2017
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Document Summary
Soil pedon (profile) is important to soil scientists. Mass-balance concept of soils: additions, losses, changes that occur inside. In soil: rain translocates stuff, chemical reactions change stuff. Soil formation: a horizon (loses everything but carbon), b horizon (change over time), c horizon. Soils change over time from: climate, topography, parent material, vegetation, soil organisms. Compare soil structure (prism-like, block-like, etc. ) to soil texture (clay, loam, sand, silt grain size distribution, not how it feels) Soil mass and volume relations know what they are (particle density, dry bulk. Hydrometers, neutron probes: multiple choice question density, etc), and how to calculate them. Conductivity changes and moisture content: drains = more negative pressure = less conductivity, large pores drain first because they have weaker menisci and larger diameter. Available water: coarse = less because the water drains out, depends on soil texture. Soil aeration: when water drains, air (gases) replaces it.
