4.4 Classification of Succession Based on the initial condition (living propagules) 按演替的起始条件划分为： Consists of 2 types: ·Primary Succession原生演替 ·Secondary Succession次生演替 Primary Succession Time Pionee community mgnie Climax ommunity Exposed rocks hite spruce Secondary Succession after disturbance:a bereal Paper birch forest one(left)and two years(right)after a wildfire.8 • Consists of 2 types: • Primary Succession 原生演替 • Secondary Succession 次生演替 4.4 Classification of Succession Based on the initial condition (living propagules) 按演替的起始条件划分为: Secondary Succession after disturbance: a boreal forest one (left) and two years (right) after a wildfire