气候变化领域集成服务门户(CCPortal): Persistent effects of fire severity on ponderosa pine regeneration niches and seedling growth

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DOI	10.1016/j.foreco.2020.118502
	Persistent effects of fire severity on ponderosa pine regeneration niches and seedling growth
	Owen S.M.; Sieg C.H.; Fulé P.Z.; Gehring C.A.; Baggett L.; Iniguez J.M.; Fornwalt P.J.; Battaglia M.A.
发表日期	2020
ISSN	0378-1127
卷号	477
英文摘要	Several recent studies have documented how fire severity affects the density and spatial patterns of tree regeneration in western North American ponderosa pine forests. However, less is known about the effects of fire severity on fine-scale tree regeneration niche attributes such as understory plant composition and cover, surface fuel abundance, and soil properties, or how these attributes in turn affect regenerating ponderosa pine growth. Using 1-m2 plots centered on 360 ponderosa pine seedlings that regenerated naturally after the Pumpkin Fire in 2000 in Arizona, we quantified regeneration niche attributes 13 years post-fire and measured their associations with seedling growth 11–16 years post-fire. Plots were established in a) unburned, b) moderate-severity, and two types of high-severity (100% tree mortality) burns, either c) adjacent to residual live forest edges (high-severity edge plots), or d) >200 m from any residual live trees (high-severity interior plots). We found that all burned plots had greater understory plant species richness, percent cover of forbs, exotic plants and coarse wood, as well as higher soil pH, sand and gravel content, and lower soil clay content compared to unburned plots. High-severity burn plots had the greatest total understory plant and shrub cover, the most herbaceous fine fuel biomass, and tended to have the highest soil nitrogen content compared to other burn severity classes. Ponderosa pine growth (i.e., stem diameter at root collar (DRC) and length of terminal leader) was lowest in the unburned compared to burned plots, and ponderosa pine terminal leader growth was consistently greater in the high-severity edge plots compared to other severities. Finally, niche characteristics such as overstory tree canopy cover (−), soil phosphate (+), and cover of coarse wood (+), forbs (+), and the native grasses, mountain muhly (+) and squirreltail (−), were important explanatory variables of ponderosa pine growth. Exotic plant cover did not have a negative association with ponderosa pine growth. These results suggest that if ponderosa pine seeds can disperse and germinate, and if seedlings can survive the first few critical years after germination, then low overstory canopy cover and abundant forbs or coarse wood may be associated with increased growth rates. Alternatively, forbs may be responding to the same site benefits as the seedling; and abundant forbs, coarse wood, and fine fuels might also put seedlings at increased risk of mortality from subsequent fire, at least until they are taller and more fire resistant. © 2020
英文关键词	Arizona; Forest resilience; Pinus ponderosa; Soils; Surface fuels; Understory plant communities
语种	英语
scopus关键词	Fires; Fuels; Mining laws and regulations; Plants (botany); Seed; Soils; Wood; Wood fuels; Explanatory variables; Plant species richness; Ponderosa pine forest; Residual live trees; Soil clay content; Soil nitrogen content; Tree canopy covers; Tree regeneration; Reforestation; coniferous tree; forest fire; grass; growth rate; herb; introduced species; mortality; niche; overstory; phosphate; plant community; regeneration; root system; sand and gravel; seedling; shrub; soil nitrogen; species richness; understory; vegetation cover; Fires; Fuels; Growth; Pinus Ponderosa; Reforestation; Wood; Arizona; United States; Elymus elymoides; Muhlenbergia montana; Pinus ponderosa; Poaceae
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/154968
作者单位	USDA Forest Service, Rocky Mountain Research Station, 2500 S. Pine Knoll Drive, Flagstaff, AZ 86001, United States; School of Forestry, Northern Arizona University, PO Box 15018, Flagstaff, AZ 86011, United States; Department of Biological Sciences and the Center for Adaptable Western Landscapes, Northern Arizona University, Flagstaff, AZ 86011, United States; USDA Forest Service, Rocky Mountain Research Station, 240 W. Prospect Road, Fort Collins, CO 80526, United States
推荐引用方式 GB/T 7714	Owen S.M.,Sieg C.H.,Fulé P.Z.,et al. Persistent effects of fire severity on ponderosa pine regeneration niches and seedling growth[J],2020,477.
APA	Owen S.M..,Sieg C.H..,Fulé P.Z..,Gehring C.A..,Baggett L..,...&Battaglia M.A..(2020).Persistent effects of fire severity on ponderosa pine regeneration niches and seedling growth.Forest Ecology and Management,477.
MLA	Owen S.M.,et al."Persistent effects of fire severity on ponderosa pine regeneration niches and seedling growth".Forest Ecology and Management 477(2020).