BOTANY 123 Study Guide - Landscape Ecology, Habitat Destruction, Ecolo
Document Summary
Reduced growth and increased mortality (less biomass and yield. Severity of disease is proportional to number of years the trees were cropped previously. Changes in phsyio-chemical and biological properties of soil due to agricultural practices resulting in decreased plant health and productivity. Factors causing soil sickness can be abiotic or biotic: nutrient imbalance; soil compaction. Cultivation of one species over a wide area. The good: uniformity: you know what you are getting, efficient planting, harvesting, and managing, limited land and world demand. The bad: something that affects one is then likely to affect all of it, exerts constant selection pressure on soil organisms, altered soil quality. Poor soil structure/ drainage, nutrient imbalance, too acidic/basic, build up of toxins of heavy metal. Several nematodes: root-knot, ring, root lesion. Soil organisms can break down prunasin and release cyanide. To suffer of each other the inhibition of growth of one species of plants by chemicals produced by another.
