4.3 The causes of plant succession Autogenic自发：Habitat biotic factor e.g.replacement P207 -208 of existing community by the next results from the afterlife effects of the former that makes the habitat unsuitable to continue.通过群落自身对环境的反作用使环境条件发生 变化，由于这些变化了的条件的作用形成了新的群落而引起演替 Allogenic.异发楂：Habitat abiotic factors such as soil parent material,pH,nutrients drives the direction of succession.e.g.filling of a lake with sediment and the further modified by the colonizing.plants.由于受到野火、采 伐、育林、洪水、火山活动等来自群落以外的作用所引起的演楂。 Biogenic生物进化演替：Vhen a sudden interference with an autogenic and allogenic succession by a living organism that becomes a major agent of succession e.g. herbivore,insect infestation etc.生物之活动扮演着重要关键角色 而引发的演替 7 4.3 The causes of plant succession Autogenic自发演替: Habitat biotic factor e.g. replacement of existing community by the next results from the afterlife effects of the former that makes the habitat unsuitable to continue.通过群落自身对环境的反作用使环境条件发生 变化, 由于这些变化了的条件的作用形成了新的群落而引起演替 Allogenic异发演替 : Habitat abiotic factors such as soil parent material, pH, nutrients drives the direction of succession. e.g. filling of a lake with sediment and the further modified by the colonizing plants.由于受到野火、采 伐、育林、洪水、火山活动等来自群落以外的作用所引起的演替。 Biogenic生物进化演替 : When a sudden interference with an autogenic and allogenic succession by a living organism that becomes a major agent of succession e.g. herbivore, insect infestation etc.生物之活动扮演着重要关键角色 而引发的演替 P207 -208