BIO120H1 Lecture Notes - Lecture 9: Secondary Succession, Climax Species, Primary Succession
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BIO120H1 Full Course Notes
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What drives species replacement (succession): build-up of a complex soil (from a simple substrate) Abandoned farms turned back to nature through succession in vegetaion. Most important process in primary succession is the development of a more complex soil (development of smaller paricle sizes and incorporaion of organic mater into the inorganic soil matrix of sand or bedrock) For secondary succession, shade is more important, not soil. Secondary succession by deiniion occurs in areas where there has been plant development of some kind but has been destroyed by some event. Even though soil is more important in primary and shade in secondary, sill both important for both. Spruce-ir forest doesn"t replace itself, you don"t ind anything under it, as it"s too shaded and too dark to grow, so ater spruce-ir forest dies, nothing grows ater it, so system goes to an unstable climax. Some systems have ire as a rarity while others have ire as a regular occurrence.
