气候变化领域集成服务门户(CCPortal): Establishment and heteroblasty of Acacia koa in canopy gaps

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DOI	10.1016/j.foreco.2019.117592
	Establishment and heteroblasty of Acacia koa in canopy gaps
	Rose K.M.E.; Friday J.B.; Jacobs D.F.
发表日期	2019
ISSN	0378-1127
卷号	453
英文摘要	Acacia spp. are important tropical forest trees but their commercial value may be limited by expression of poor apical dominance and extensive lateral branching. Multiple-aged and gap silviculture may harness the developmental plasticity of phyllodinous Acacia spp. to improve regeneration establishment, without sacrificing survival rates, by delaying heteroblasty (transition early in development from true leaves to modified petioles called phyllodes). However, successful development of this system is dependent on knowledge of seedling shade tolerance and ability to establish within canopy gaps. We planted Hawaiian Acacia koa (koa) beneath an existing restoration planting with a monospecific overstory canopy of koa on a dry site within koa's natural range. Seedlings originated from a local putative drought-adapted population and a non-local mesic-adapted population, allowing evaluation of responses to a continuous light availability gradient in two populations. Leaf transition rates and the growth and survival impacts of rust fungus infection introduced from the existing canopy were also assessed. We detected significant and positive responses to light availability. Koa exhibited low shade tolerance and cannot sustain overtopping; both height and basal diameter growth increased exponentially with increasing canopy openness. Transition to high-light, drought-adapted mature foliage occurred more rapidly with increasing light availability. High developmental plasticity occurred in response to shading, but we did not find evidence of the adaptive value in that plasticity because of low survival rates and reduced growth in low-light microsites. We detected evidence for a growth-survival trade-off in which the non-local population grew faster overall, yet had reduced survival. Rust infection reduced survival and growth, limiting the possibility of converting degraded koa plantations into multiple-aged, gap silviculture systems. High rust infection rates and impacts on field performance found in this study reflect potential for pathogen-limited growth and survival in gap silviculture. © 2019 Elsevier B.V.
英文关键词	Gap silviculture; Growth-survival trade-off; Heteroblasty; Irradiance; Koa; Rust; Shade tolerance
语种	英语
scopus关键词	Drought; Economic and social effects; Plasticity; Reforestation; Gap silviculture; Heteroblasty; Irradiance; Rust; Shade tolerance; Trade off; Population statistics; apical dominance; environmental restoration; fitness; foliage; fungus; legume; restoration ecology; rust disease; seedling; shade tolerance; silviculture; survival; trade-off; tropical forest; Acacia Koa; Diseases; Drought; Growth; Light; Plasticity; Reforestation; Survival; Acacia; Acacia koa; Uredinales
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155731
作者单位	Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, United States; Department of Natural Resources Management, New Mexico Highlands University, Las Vegas, NM, United States; Department of Natural Resources and Environmental Management, University of Hawaii at Manoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Rose K.M.E.,Friday J.B.,Jacobs D.F.. Establishment and heteroblasty of Acacia koa in canopy gaps[J],2019,453.
APA	Rose K.M.E.,Friday J.B.,&Jacobs D.F..(2019).Establishment and heteroblasty of Acacia koa in canopy gaps.Forest Ecology and Management,453.
MLA	Rose K.M.E.,et al."Establishment and heteroblasty of Acacia koa in canopy gaps".Forest Ecology and Management 453(2019).