Apes Flashcards

5451799477	Bioaccumulation	An increase in the concentration of a chemical in specific organs or tissues at a level higher than would normally be expected.	0
5451799478	Bio magnification	Increase in concentration of DDT, PCBs, and other slowly degradable, fat-soluble chemicals in organisms at successively higher trophic levels of a food chain or web.	1
5451799479	Desertification	Conversion of rangeland, rain-fed crop land, or irrigated Copland to desert like land, with a drop in agricultural productivity of 10% or more. It usually is caused by a combination of overgrazing, soil erosion, prolonged drought , and climate change.	2
5451799480	Humus	Slightly soluble residue of undigested or partially decomposed organic material in topsoil. This material helps retain water and water -soluble nutrients, which can be taken up by plant roots.	3
5451799481	Intercropping	Growing two or more different crops at the same time on a plot. For example, a carbohydrate rich grain that depletes soil nitrogen and a protein-rich legume that adds nitrogen to the soil may be inter cropped.	4
5451799482	Salinization	Accumulation of salts in soil that can eventually make soil unable to support plant growth.	5
5451799483	Soil	Complex mixture of inorganic minerals (clay, silt, pebbles, and sand), decaying organic matter, water, air , and living organisms.	6
5451799484	Clear-cutting	Method of timber harvesting in which all trees in a forested area are removed in a single cutting.	7
5451799485	Deforestation	Removal of trees from a forested area.	8
5451799486	Strip-cutting	Variation of clear-cutting in which a strip of trees is clear-cut along the contour of the land, with the corridor being narrow enough to allow natural regeneration within a few years. After regeneration, another strip is cut above the first, and so on.	9