| DOI: | 10.1016/j.foreco.2016.06.039
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| Scopus记录号: | 2-s2.0-84976558906
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| 论文题名: | Seeded pioneer die-offs reduce the functional trait space of new-growth coastal dune forests |
| 作者: | Rolo V.; Olivier P.; van Aarde R.
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| 刊名: | Forest Ecology and Management
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| ISSN: | 0378-1127
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| 出版年: | 2016
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| 卷: | 377 | | 起始页码: | 26
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| 结束页码: | 35
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| 语种: | 英语
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| 英文关键词: | Canopy gaps
; Community assembly
; Environmental filtering
; Forest restoration
; Functional diversity
; Hemispherical photographs
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| Scopus关键词: | Conservation
; Hardwoods
; Patient rehabilitation
; Reforestation
; Restoration
; Sanitary sewers
; Seed
; Canopy gaps
; Community assembly
; Forest restoration
; Functional diversity
; Hemispherical photographs
; Forestry
; adult
; canopy gap
; coastal zone
; community composition
; community structure
; forest canopy
; light availability
; photograph
; pioneer species
; regeneration
; restoration ecology
; seedling
; Acacia karroo
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| 英文摘要: | The planting or seeding of pioneer species to promote restoration apparently contributes little to the establishment of late-successional species, despite the common assumption that they facilitate forest regeneration. We evaluate the consequences of planting pioneers for coastal dune restoration by measuring plant traits (specific leaf area, wood density, δ13C and maximum plant height), species composition and canopy openness in three rehabilitating forests of different ages, where a pioneer species (Acacia karroo) was seeded, and one undisturbed old-growth forest. We surveyed woody species composition in 2010 and in 2015 to assess how changes in A. karroo influences community structure of rehabilitating forest. Our results showed that the number of adult individuals of A. karroo decreased progressively with forest age, indicating that the demise of individuals of A. karroo opens canopy gaps in rehabilitating sites. This accorded with a significantly higher variation of canopy openness levels in the oldest rehabilitating site. Rehabilitating sites tended to progress towards a reduced trait space as they aged, contrasting with the old-growth forest that showed an expanded trait space. Communities located at high levels of canopy openness were dominated by species with lower values of specific leaf area and wood density, indicative of acclimation to high light conditions and fast-growing strategies. Our results suggest that changes in light availability due to canopy gap formation, can act as an environmental filter which may deflect forest regeneration trajectories. We show that coupling a trait-based approach with environmental measurements can give insight in regeneration trajectories of rehabilitating sites and, therefore, better inform restoration practices. Preventing the formation of large canopy gaps in restoration programs using pioneers as a regeneration pathway may facilitate the natural recovery of degraded forest. © 2016 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/64790
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| Appears in Collections: | 影响、适应和脆弱性
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作者单位: | Conservation Ecology Research Unit, University of Pretoria, Hatfield, Pretoria, South Africa
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| Recommended Citation: | |
Rolo V.,Olivier P.,van Aarde R.. Seeded pioneer die-offs reduce the functional trait space of new-growth coastal dune forests[J]. Forest Ecology and Management,2016-01-01,377
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