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DOI	10.1016/j.foreco.2020.118100
	The impact of tree canopy structure on understory variation in a boreal forest
	Majasalmi T.; Rautiainen M.
发表日期	2020
ISSN	0378-1127
卷号	466
英文摘要	Information on understory composition and its relationships with the overstory tree canopy, especially leaf area index (LAI), is crucially needed in, e.g., modeling land-atmosphere interactions and productivity of forests. There are also several global LAI products produced from satellite data which need to be validated with ground reference data. However, to date, only scarce field data on simultaneous structural properties of under- and overstory vegetation, and tree canopy LAI, have been available in boreal forests. This paper shows how understory composition and fractional cover of different species types varies in a boreal forest site, and how it is linked to structural properties of the tree layer. The study is based on 301 understory plots collected in an area of ∼16 km2 around Hyytiälä forestry field station, Finland (61°50′N, 24°17′E) in a southern boreal forest site. Forest understory plot data was accompanied with measurements of both standard forest inventory variables and optically-based canopy light transmittance data. Clear differences in average species composition between different site fertility types were observed, but also large variation within each site fertility type was noted. Forest understory composition was better correlated with structural forest canopy measures (e.g., tree canopy LAI, canopy cover, canopy openness) than with traditional forest inventory variables such as tree height or diameter. Forest canopy LAI and the fractional cover of understory were strongly related, especially in more fertile sites. Our results highlight the role of tree canopy structural metrics as modifiers of the understory light climate and growing conditions, also, in boreal forests. © 2020 The Authors
英文关键词	Canopy cover; Canopy openness; Forest canopy; Hyytiälä; LAI; Leaf area index; Site fertility
语种	英语
scopus关键词	Plants (botany); Structural properties; Forest understory; Growing conditions; Land atmosphere interaction; Light transmittance; Southern boreal forests; Species composition; Structural metrics; Understory composition; Forestry; boreal forest; canopy architecture; forest inventory; forest management; forest soil; leaf area index; satellite data; site investigation; soil fertility; understory; Coverings; Data; Forestry; Forests; Transmittance; Tree Dimensions; Variables; Finland; Hyytiala; Pirkanmaa
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/155281
作者单位	Aalto University, School of Engineering, Department of Built Environment, P.O. Box 14100, Aalto, 00076, Finland; Aalto University, School of Electrical Engineering, Department of Electronics and Nanoengineering, P.O. Box 14100, Aalto, 00076, Finland
推荐引用方式 GB/T 7714	Majasalmi T.,Rautiainen M.. The impact of tree canopy structure on understory variation in a boreal forest[J],2020,466.
APA	Majasalmi T.,&Rautiainen M..(2020).The impact of tree canopy structure on understory variation in a boreal forest.Forest Ecology and Management,466.
MLA	Majasalmi T.,et al."The impact of tree canopy structure on understory variation in a boreal forest".Forest Ecology and Management 466(2020).