globalchange  > 气候变化事实与影响
DOI: 10.1016/j.jag.2015.07.007
Scopus记录号: 2-s2.0-84988419504
论文题名:
Inter- and intra-annual variations of clumping index derived from the MODIS BRDF product
作者: He L; , Liu J; , Chen J; M; , Croft H; , Wang R; , Sprintsin M; , Zheng T; , Ryu Y; , Pisek J; , Gonsamo A; , Deng F; , Zhang Y
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2016
卷: 44
起始页码: 53
结束页码: 60
语种: 英语
英文关键词: BRDF ; Clumping index ; MODIS ; Seasonality ; Variation
Scopus关键词: annual variation ; bidirectional reflectance ; broad-leaved forest ; coniferous forest ; deciduous forest ; leaf area index ; mixed forest ; MODIS ; savanna ; seasonal variation ; seasonality ; Coniferophyta
英文摘要: Clumping index quantifies the level of foliage aggregation, relative to a random distribution, and is a key structural parameter of plant canopies and is widely used in ecological and meteorological models. In this study, the inter- and intra-annual variations in clumping index values, derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) BRDF product, are investigated at six forest sites, including conifer forests, a mixed deciduous forest and an oak-savanna system. We find that the clumping index displays large seasonal variation, particularly for the deciduous sites, with the magnitude in clumping index values at each site comparable on an intra-annual basis, and the seasonality of clumping index well captured after noise removal. For broadleaved and mixed forest sites, minimum clumping index values are usually found during the season when leaf area index is at its maximum. The magnitude of MODIS clumping index is validated by ground data collected from 17 sites. Validation shows that the MODIS clumping index can explain 75% of variance in measured values (bias = 0.03 and rmse = 0.08), although with a narrower amplitude in variation. This study suggests that the MODIS BRDF product has the potential to produce good seasonal trajectories of clumping index values, but with an improved estimation of background reflectance. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80136
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作者单位: Department of Geography and Program in Planning, University of Toronto, ON M5S 3G3, Toronto, Canada; School of Atmospheric Sciences, Nanjing University, Nanjing, China; Forest Management and GIS Department, Jewish National Fund-Keren Kayemet LeIsrael, Eshtaol, M.P. Shimshon, Israel; Department of Landscape Architecture and Rural Systems Engineering, Seoul National University, Seoul, South Korea; Tartu Observatory, Tõravere, Estonia; Department of Physics, University of Toronto, M5S 1A7, Ontario, Canada; Department of Biological Sciences, Delta State University, Cleveland, MS, United States

Recommended Citation:
He L,, Liu J,, Chen J,et al. Inter- and intra-annual variations of clumping index derived from the MODIS BRDF product[J]. International Journal of Applied Earth Observation and Geoinformation,2016-01-01,44
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