Canopy clumping index (CI): A review of methods, characteristics, and applications

doi:10.1016/j.agrformet.2021.108374

	Canopy clumping index (CI): A review of methods, characteristics, and applications
	Fang, Hongliang 1,2
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2021-06-15
卷号	303 页码:18
关键词	Clumping index (CI) Leaf area index (LAI) Effective LAI Normalized difference hotspot and darkspot (NDHD) Field measurement Remote sensing estimation
ISSN号	0168-1923
DOI	10.1016/j.agrformet.2021.108374
通讯作者	Fang, Hongliang(fanghl@lreis.ac.cn)
英文摘要	Canopy clumping index (CI) characterizes the spatial distribution of leaves or needles within a vegetation canopy. CI is critical in determining the canopy radiation transfer, photosynthesis, and hydrological processes. This paper reviews the field measurement and remote sensing estimation methods, characteristics, and applications of CI. CI is generally estimated in the field using direct, indirect optical, and allometric methods. The basis for the indirect optical approach is the gap-fraction based method. Remote sensing of CI is carried out using passive optical and active LiDAR technology. Current CI products are mainly derived from an empirical relationship with the normalized difference hotspot and darkspot (NDHD) index. Further CI product validation studies should be conducted using enhanced field measurements. CI typically shows vertical, scale, directional, and temporal variations. The overall CI is calculated as the integration of the directional CI values. CI is a key parameter in leaf area index (LAI) estimation, and canopy reflectance and land surface modeling studies. Future studies should focus on the adoption of automated and wireless measurement methods, development of new remote sensing estimation methods, improving our understanding of the CI characteristics, and accounting for CI in land surface models.
资助项目	National Key Research and Development Program of China[2016YFA0600201]
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000639140200008
资助机构	National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/161770]
专题	中国科学院地理科学与资源研究所
通讯作者	Fang, Hongliang
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, LREIS, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Fang, Hongliang. Canopy clumping index (CI): A review of methods, characteristics, and applications[J]. AGRICULTURAL AND FOREST METEOROLOGY,2021,303:18.
APA	Fang, Hongliang.(2021).Canopy clumping index (CI): A review of methods, characteristics, and applications.AGRICULTURAL AND FOREST METEOROLOGY,303,18.
MLA	Fang, Hongliang."Canopy clumping index (CI): A review of methods, characteristics, and applications".AGRICULTURAL AND FOREST METEOROLOGY 303(2021):18.