ENVS 3210 Lecture Notes - Lecture 14: Climax Community, Lava Field, Tillage
7 Dec 2018
School
Department
Course
Professor
Document Summary
Ecological succession: process by which an ecosystem changes over time in a predictable manner, primary, when there was nothing before, ex. Lava field, lake filling up: secondary, plants were there and new plants grow, ex. One year after forest fire, trees growing on abandoned meadow: pioneer species > intermediate species > climax community. Phase 1: nudation: development of a bare site (disturbance) Phase 2: migration: arrival of propagates(includes seeds and other units plants may use) Phase 3: ecesis: involves establishment and initial growth of vegetation. Phase 4: competition: various species compete for resources. Phase 5: reaction: auto genie changes affect the habitat resulting in replacement of one plant community by another. Phase 6: stabilization: reaction phase leads to development of a climax community. Stability: climax, trees, long life, slow growth, biomass accumulation (instead of reproduction) Dormancy is a state that prevents viable, living seed from germinating under adequate conditions. Some plants have internal inhibitors; such as ragweed.
