Optical stratification porosity as a measure of vertical canopy structure in a Japanese coastal forest

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	Optical stratification porosity as a measure of vertical canopy structure in a Japanese coastal forest
	Zhu, JJ; Matsuzaki, I; Gonda, Y; Zhu, JJ, Niigata Univ, Fac Agr, 2-8050 Ikarashi, Niigata 9502181, Japan
刊名	FOREST ECOLOGY AND MANAGEMENT
	2003
卷号	173 期号:1-3 页码:89-104
关键词	Optical Stratification Porosity Stratified Canopies Vertical Forest Structure Japanese Coastal Forest Thinning Regimes
ISSN号	0378-1127
英文摘要	Porosity of a forest stand is an important descriptor of vertical forest structure, although it is a difficult variable to define and measure because of its three-dimensional nature. Fortunately, studies on the effects of obstruction on irradiation in forest stands provide us with a method which uses a hemispherical photographic silhouette to estimate an alternative measure of porosity, here defined as optical stratification porosity (OSP). The differences between OSP and canopy closure, canopy cover and canopy gap, which are frequently used by ecologists and foresters, are discussed. The estimation of OSP of a forest stand using hemispherical photographic silhouettes is evaluated based on an analysis of stratification patterns in vertical forest structure. The OSP measured in a coastal pine forest having different thinning ratios is presented as an example to demonstrate the method. The results indicate that when the strata can be visually identified, the OSP can be obtained using hemispherical photographic silhouettes. Alternatively, if OSP is measured at various canopy heights in a forest stand continuously, the stratified vertical structure patterns of the forest stand can be determined. The predicted stratification of vertical forest structure based on the measurement of OSP can indicate the vertical strata more accurately than visual identification alone. Therefore, the estimation of OSP may be helpful in modeling wind profile, leaf area index, crown ratio and light inside a forest stand and may prove useful to those applications in which fine-scale vertical stratification is desirable. (C) 2002 Elsevier Science B.V. All rights reserved.
学科主题	Forestry
语种	英语
WOS记录号	WOS:000180897400008
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/55423]
专题	沈阳应用生态研究所_沈阳应用生态研究所
通讯作者	Zhu, JJ, Niigata Univ, Fac Agr, 2-8050 Ikarashi, Niigata 9502181, Japan
推荐引用方式 GB/T 7714	Zhu, JJ,Matsuzaki, I,Gonda, Y,et al. Optical stratification porosity as a measure of vertical canopy structure in a Japanese coastal forest[J]. FOREST ECOLOGY AND MANAGEMENT,2003,173(1-3):89-104.
APA	Zhu, JJ,Matsuzaki, I,Gonda, Y,&Zhu, JJ, Niigata Univ, Fac Agr, 2-8050 Ikarashi, Niigata 9502181, Japan.(2003).Optical stratification porosity as a measure of vertical canopy structure in a Japanese coastal forest.FOREST ECOLOGY AND MANAGEMENT,173(1-3),89-104.
MLA	Zhu, JJ,et al."Optical stratification porosity as a measure of vertical canopy structure in a Japanese coastal forest".FOREST ECOLOGY AND MANAGEMENT 173.1-3(2003):89-104.