单语范例（未经PONS编辑处理）
英语
- Unlike in primary succession, the species that dominate secondary succession, are usually present from the start of the process, often in the soil seed bank.en.wikipedia.org
- Ecosystems that experience disturbances that undergo primary succession.en.wikipedia.org
- Primary succession starts to begin on rock formations, such as volcanoes or mountains, or in a place with no organisms or soil.en.wikipedia.org
- The early stages of primary succession are dominated by species with small propagules (seed and spores) which can be dispersed long distances.en.wikipedia.org
- Nitrogen supplies are limited in new soils, and nitrogen-fixing species tend to play an important role early in primary succession.en.wikipedia.org
- Management undertaken in recent years has been essential to maintaining open areas, the most threatened by primary succession.en.wikipedia.org
- Primary succession occurs when pioneer species such as lichens colonize rock.en.wikipedia.org
- Secondary succession is much more common than primary succession in the tropics.en.wikipedia.org
- Secondary succession is much more commonly observed and studied than primary succession.en.wikipedia.org
- Regardless of its name, the equilibrium stage of primary succession is the highest natural form of development that the environmental factors are capable of producing.en.wikipedia.org
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