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Secondary succession is one of the two types of ecological succession of plant life. As opposed to the first, primary succession, secondary succession is a process started by an event (e.g. forest fire, harvesting, hurricane) that reduces an already established ecosystem (e.g. a forest or a wheat field) to a smaller population of species, and as such secondary succession occurs on preexisting soil whereas primary succession usually occurs in a place lacking soil. Simply put, secondary succession is the succession that occurs after the initial succession has been disrupted and some plants and animals still exist. It is usually faster than primary succession as: # Soil is already present, so there is no need for pioneer species; # Seeds, roots and underground vegetative organs of plants may still survive in the soil. ==Mechanism== Many mechanisms can trigger succession of the second including facilitation such as trophic interaction, initial composition, and competition-colonization trade-offs.〔Cook, W.M., Yao, J., Forster, B.L., Holt, R.D., Patricks, L.B., 2005. Secondary succession in an experimentally fragmented landscape: Community pattern across space and time. Ecology, 86: 1267-1279〕 The factors that control the increase in abundance of a species during succession may be determined mainly by seed production and dispersal, micro climate; landscape structure (habitat patch size and distance to outside seed sources);〔 Bulk density, pH, soil texture (sand and clay).〔Van der Kamp, J., Yassir, I., Buurman, P., 2009. Soil carbon changes upon secondary succession in ''Imperata'' grasslands (East Kalimantan, Indonesia). Geoderma, 149: 76-83〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「secondary succession」の詳細全文を読む スポンサード リンク
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