Chapter 15 Outline Apes Essay example
* Chemical * Physical * Topography, a region’s surface features such as the presence or absence of mountains and valleys, is also involved in soil formation. * Soil Composition: soil is composed of 4 distinct parts, minerals that make up 45% of a soil. * Organic Material (5%) * Water (25%) * Air (25%) * Mineral portion …show more content…
* Major Soil Groups: * Spodsol: in cold climate. Characteristic of evergreen forests (Great Lakes) * Alfisol: in humid climate with hot summers and cold winters. Temperate deciduous forests (Michigan) * Millisol: in semiarid climate with hot summers and cold winters. Temperate grassland (North Dakota) * Ardisol: in dry climate. Characteristic of desert. (Nevada) * Oxisol: in wet warm climate, characteristic of tropical rain (Hawaii) * Sustainable Soils Use: The wise use of soil resources, without reduction in soil fertility, so that the soil remains productive for future generations. * Natural Resources Conservation Service: measures the rate of soil erosion at thousands of sites across the Unites States.
* AMERICAN DUST BOWL
* Salinization: The gradual accumulation of salt in a soil, often as a result of improper irrigation methods * Desertification: Degradation of once- fertile rangeland, or tropical dry forest into nonproductive desert. * Conservation tillage: A method of cultivation in which residues from previous crops are left in the soil, partially covering it and helping to hold it in place until the newly planted seeds are