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soils week 3
| Question | Answer |
|---|---|
| How does tilling impact soil | overtime you'll see loss in productivity - soil loss - erosion - crusting of A horizon |
| What are some advantages of not tilling | - retain organic matter - less work than tilling - doesn't expose top soil to crusting which would flood the topsoil |
| Particle density | mass per unit volume of the soil (grams cm3) - not affected by pore space ex. organic matter will be low (denser) |
| Bulk density | mass of a unit volume of dry soil - mass grams over cm3 -mass is the weight of the dry soil - when soil is compacted there is less pore space meaning density goes up |
| Pore space - macropores | allow for water and root penetration -packing/interped/biopores - larger enough for plant roots - air and water can move easily through |
| Interped pores | Cracks allow for water/root penetrations |
| Biopores | Penetrating roots that die and leave the space |
| Pore space - micropores | - air movement is slow - often filled with water - very small pore may have water that plants cannot access |
| Soil consistence | ease with which a soil can be reshaped or ruptured |
| Soil consistency | how well a soil resists penetration |
| Pedon | 1-10m2 - smallest sampling unit (lateral 1-3.5, deep 1-2m) - group of similar pedons is a polypedon |
| when is a soil a soil | - naturally occuring - unconsolidated mineral or organic material (compacted or cemented) - min 10cm thick - on earth surface + less than 60 cm of water covering - can support vegetation - layer of material more than 50cm covering than buried soil |
| Regosolic order (entisols) | - no recognizable B horizon greater than 5cm thick - may have organic horizons -associated with recent mass wasting or deposition - can occur where material is resistant to weathering |
| what might result in a little to no B horizon | - not enough time/ preventing something from changing (slopes/dry/cold/quartz) - Youthfulness, unstable material - recent alluvium |
| Humid Regosol | - Ah - enriched with organics, 17% or less carbon by weight - dark coloured Ap – disturbed by humans |
| Orthic regosol | - Ah – at least 10 cm thick - Low organic matter |
| What brought the material here? |
Created by:
Alyssa22122
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