unit #2 soil
DESCRIPTION
UNIT #2 Soil. What is soil?. Soil: A mixture of mineral particles and organic material that covers the land, and in which terrestrial plants grow. Other Definitions…. See textbook. Permeability and Porosity. Why Degradation?. Human activities such as overgrazing , - PowerPoint PPT PresentationTRANSCRIPT
UNIT #2 Soil
What is soil?
Soil: A mixture of mineral particles and organic material that covers the land, and in which terrestrial plants grow.
Other Definitions…
See textbook.
Permeability and Porosity
Why Degradation?
• Human activities such as overgrazing,
deforestation, unsustainable agriculture and
irrigation cause processes of degradation. • These include soil erosion, toxification and
salinization.• Desertification (enlargement of deserts
through human activities) can be associated with this degradation.
Soil Conservation
• soil conditioners (for example, use of lime
and organic materials)
• wind reduction techniques (wind breaks,
shelter belts, strip cultivation)
• cultivation techniques (terracing, contour
plowing)
• efforts to stop plowing of marginal lands.
LEDC vs MEDC
Sources Visited• http://www.eslarp.uiuc.edu/la/LA437-F94/soils/texture.gif• http://www.atmos.albany.edu/deas/atmclasses/atm301/soil_xsec.jpg• http://www3.gov.ab.ca/env/water/GWSW/quantity/learn/Evaluation/EV_Images/EV3_porosity.gif• http://academic.emporia.edu/aberjame/wetland/define/soil01.jpg• http://sgp.undp.org/intranet//img/projects/7167/img_VN-03-002-2.JPG• http://upload.wikimedia.org/wikipedia/commons/a/a8/No_till_farming_SemisDirect_USDA.jpg• http://www.fairfaxcounty.gov/nvswcd/images/notill2.jpg• Thomson Higher Education• http://www.uwsp.edu/stuorg/swcs/swcs_soil.jpg• http://i.pbase.com/g6/07/66107/2/85212459.PByXZTQC.jpg• http://static.panoramio.com/photos/original/23089205.jpg• http://inlinethumb45.webshots.com/26732/2664528040104237032S600x600Q85.jpg