气候变化领域集成服务门户(CCPortal): Mechanically-created gaps promote flowering and seed set of rare Penstemon personatus: Disentangling canopy opening from ground disturbance

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DOI	10.1016/j.foreco.2020.118640
	Mechanically-created gaps promote flowering and seed set of rare Penstemon personatus: Disentangling canopy opening from ground disturbance
	Bovee K.M.; Merriam K.E.; Coppoletta M.
发表日期	2021
ISSN	0378-1127
卷号	480
英文摘要	Fire exclusion from mixed conifer forests of northern California has changed the growing environment for understory plants, including the rare Penstemon personatus D.D. Keck, a rhizomatous perennial species endemic to the northern Sierra Nevada. We asked whether increased light availability and/or ground disturbance associated with mechanical thinning would change density or promote flowering of P. personatus, with particular interest in the effects of 0.2 ha gaps, where tree removal created canopy openings that may be similar to those that characterized stands under mixed-severity fire regimes. We found evidence of trade-offs at small spatial scales, with both total and flowering stem density decreasing in plots with increased ground disturbance, but a strong positive flowering stem density response in plots where tree removal increased solar exposure. One year post-treatment, solar exposure was positively correlated with flower density, seeds per capsule, and predicted seed set. At the treatment scale, there were no significant differences in total stem density among treatments or years, however flowering stem density was significantly higher in gaps two years post-treatment. The gap treatment was also strongly associated with higher flower densities, and a predicted mean rank seed set (365 seeds m−2) that was 6 times greater than seed set within the thinning treatment (53 seeds m−2), contrasting sharply with a near total lack of seed set in control plots. This study emphasizes the importance of canopy gaps to this rare species, with local negative effects of ground disturbance from mechanical thinning offset by treatment-level promotion of flowering and seed set. © 2020
英文关键词	Canopy gaps; Closed-throated beardtongue; Flowering response; Mechanical thinning; Rare plant management; Solar exposure; Understory response
语种	英语
scopus关键词	Economic and social effects; Flower density; Flowering stems; Growing environments; Light availability; Mechanical thinning; Mixed-conifer forests; Thinning treatment; Treatment level; Forestry; canopy architecture; coniferous forest; endemic species; environmental disturbance; flowering; gap dynamics; light availability; mixed forest; rare species; seed set; thinning; Density; Exposure; Forestry; Processing; Seeds; Set; Thinning; Trees; California; Sierra Nevada [California]; United States; Coniferophyta; Penstemon; Penstemon personatus
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/154850
作者单位	USDA Forest Service, Lassen National Forest, PO Box 767, 900 E Highway 36, ChesterCA 96020, United States; USDA Forest Service, Sierra-Cascade Province Ecology Program, 159 Lawrence St., QuincyCA 95971, United States
推荐引用方式 GB/T 7714	Bovee K.M.,Merriam K.E.,Coppoletta M.. Mechanically-created gaps promote flowering and seed set of rare Penstemon personatus: Disentangling canopy opening from ground disturbance[J],2021,480.
APA	Bovee K.M.,Merriam K.E.,&Coppoletta M..(2021).Mechanically-created gaps promote flowering and seed set of rare Penstemon personatus: Disentangling canopy opening from ground disturbance.Forest Ecology and Management,480.
MLA	Bovee K.M.,et al."Mechanically-created gaps promote flowering and seed set of rare Penstemon personatus: Disentangling canopy opening from ground disturbance".Forest Ecology and Management 480(2021).