Estimation of canopy gap size and gap shape using a hemispherical photograph

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	Estimation of canopy gap size and gap shape using a hemispherical photograph
	Hu, LL; Gong, ZW; Li, JS; Zhu, JJ; Zhu, JJ, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China
刊名	TREES-STRUCTURE AND FUNCTION
	2009
卷号	23 期号:5 页码:1101-1108
关键词	Forest Gap Fisheye Lens Shape Index Zenith Angle Gap Size
ISSN号	0931-1890
英文摘要	Gap size and gap shape are two important properties of forest gaps that can influence microsite conditions in a forest stand and determine the recruitment and establishment of trees. There is no universally adopted method for measuring the gap size, although several options are available. In addition, few methods have been proposed for measuring the gap shape. This paper proposes a photographic method of estimating canopy gap size and gap shape. The proposed method is based on a vertical hemispherical photograph of the gap and is thus named the hemispherical photograph method (HPM). We tested the accuracy of the HPM measure of gap size by two ground-based methods and compared the HPM with other methods. Our results indicate that the HPM measurement of the canopy gap size is accurate, but is significantly influenced by the location of the camera. Compared with the ground-based methods, the HPM is more objective and repeatable. Compared with other photographic methods, HPM is more accurate due to the more actual assumptions, but is more labor-intensive because more field measurements are necessary. We conclude that the HPM is a powerful tool for comparative and long-term studies of forest gaps.
学科主题	Forestry
语种	英语
WOS记录号	WOS:000269384200022
资助机构	National Natural Science Foundation of China [30830085]; China Postdoctoral Science Foundation [20080440438]; Key Projects of Basic Scientific Research Business for National Welfare Institutes [2007KYYW04]
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/54069]
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, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Hu, LL,Gong, ZW,Li, JS,et al. Estimation of canopy gap size and gap shape using a hemispherical photograph[J]. TREES-STRUCTURE AND FUNCTION,2009,23(5):1101-1108.
APA	Hu, LL,Gong, ZW,Li, JS,Zhu, JJ,&Zhu, JJ, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China.(2009).Estimation of canopy gap size and gap shape using a hemispherical photograph.TREES-STRUCTURE AND FUNCTION,23(5),1101-1108.
MLA	Hu, LL,et al."Estimation of canopy gap size and gap shape using a hemispherical photograph".TREES-STRUCTURE AND FUNCTION 23.5(2009):1101-1108.