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OM  humus

Rain, OM. runoff. OM  humus. 1 º minerals  clays. capillary rise. leaching. Four processes : Additions Losses Translocations Transformations. OM, clay, ions. Transformations:. Influence of climate on Carbonate Layer Depth. Depth. i.e., near surface. A. A. Bw. R. 40cm.

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OM  humus

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  1. Rain, OM runoff OM  humus 1º minerals  clays capillary rise leaching • Four processes: • Additions • Losses • Translocations • Transformations OM, clay, ions Transformations:

  2. Influence of climate on Carbonate Layer Depth Depth i.e., near surface

  3. A A Bw R 40cm 60cm Cr limestone wet climate Effect of Climate on Soil Formation limestone dry climate note depths of these profiles

  4. ppt T

  5. Organisms / Climate influences on soil formation Feb 18, 2002

  6. Effect of Vegetation on SOM High High Low Rapid Rapid Slow No Seasonal Yes SOM = soil organic matter

  7. Temperate Deciduous Forest Grassland Organic matter Organic layer Leached zone Weathered PM Blocky structure CaCO3 Clays, oxides Unweathered bedrock Unweathered loess Time Time Effect of Vegetation on Development Soil Samples!

  8. Temperate Deciduous Forest Organic layer Leached zone Weathered PM Clays, oxides Unweathered bedrock Time Effect of Vegetation on Development Ultisol Sample!

  9. Grassland Organic matter Blocky structure CaCO3 Unweathered loess Time Effect of Vegetation on Development Meadow Soil Sample!

  10. Topography as an Influence on Soil Formation • Relief • Aspect • Elevation (steep vs. flat) (N,S,E,W) (link to climate, organisms) Trinity Alps Wilderness Area Northern California

  11. Landscape positions Footslope Toeslope Figure 2.13 Brady & Weil

  12. Effect of topography on soil formation Summit Backslope Toeslope

  13. 1.5 lowest 5.5 highest 4.0 3.0 4.5 6 lowest 25 highest 15 10 18 si c l Most clay si c l Most clay si l l si l Effect of Topography on Soils E. Colorado; grassland; limestone pH 7.0 7.2

  14. A A A Bw E C 1m >1m 15m Bt C C Mature Young Parent material Very mature Effect of time on soil development C

  15. Effect of time on soil development

  16. A 10cm A Bt1 80cm C Bt2 C Modern floodplain Higher terraces Time • both formed in alluvium from mixed sources • similar topography

  17. Effect of Time on Soils Primary: quartz, feldspar, etc. Secondary: smectites, illite, etc. low high low high

  18. Factors That Retard Soil Development • Low rainfall and RH • Cold temperatures • High water table • Parent materials that are mostly quartz • Very high clay content • Presence of substances toxic to plants • Very steep slopes  erosion • Disturbance frequency – e.g. fire

  19. Soil Orders Study Guide Saved as a separate file on-line

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