Impact of water background on canopy reflectance anisotropy of a paddy rice field from multi-angle measurements
文献类型：期刊论文
| 作者 | Sun, Tao1,2; Fang, Hongliang1,2; Liu, Weiwei1,2; Ye, Yongchang1,2 |
| 刊名 | AGRICULTURAL AND FOREST METEOROLOGY
 |
| 出版日期 | 2017-02-15 |
| 卷号 | 233页码:143-152 |
| 关键词 | Background reflectance Water background Water effects Canopy anisotropy Paddy rice |
| ISSN号 | 0168-1923 |
| DOI | 10.1016/j.agrformet.2016.11.010 |
| 通讯作者 | Sun, Tao(sunt@lreis.ac.cn) |
| 英文摘要 | Water background significantly affects the reflectance of partially flooded vegetation. However, the flooded background effects on the reflectance anisotropy have not been fully understood. This paper explores the water background effects on the anisotropic reflectance of rice canopy through multi-angle measurements. Seasonal multi-angle reflectance was measured for different view zenith angles (VZA) (-60 degrees-60 degrees with 15 degrees interval) in a flooded paddy rice site. Wavelengths of 550 nm, 660 nm, 850 nm and 1640 nm were extracted to show the canopy anisotropic characteristics. Two canopy anisotropic indices, the anisotropic factor (ANIF) and the anisotropy index (ANIX), were examined for both non-flooded and flooded canopies in key phenology phases. Results show that the reflectance anisotropy of rice canopy is significantly weakened by a shallow layer (approximate to 10 cm) of water. For VZA > 15 degrees, background water decreases the canopy reflectance by up to 28% and weakens the anisotropic properties when LAI < 4.0 and the fraction of vegetation cover (fCover) <80%. The background water shows barely no effect on canopy reflectance when LAI > 5.0. 1640 nm shows the strongest anisotropy when LAI < 2.0, whereas 660 nm shows more significant anisotropy when LAI > 3.0. The backward observations show stronger scattering than the forward observations for the same VZA. The data from this study can be used as input for biophysical models and as validation data for remote sensing products. (C) 2016 Elsevier B.V. All rights reserved. |
| WOS关键词 | LEAF-AREA INDEX ; AQUATIC VEGETATION ; SPECTRAL REFLECTANCE ; WETLAND VEGETATION ; HIGH-RESOLUTION ; LAND-SURFACE ; LAI ; SPECTRORADIOMETER ; PRODUCTS ; BIOMASS |
| 资助项目 | National Natural Science Foundation of China[41171333] ; National Natural Science Foundation of China[41471295] |
| WOS研究方向 | Agriculture ; Forestry ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000393259400013 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/64955]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Sun, Tao |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, LREIS, 11A Datun Rd, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Tao,Fang, Hongliang,Liu, Weiwei,et al. Impact of water background on canopy reflectance anisotropy of a paddy rice field from multi-angle measurements[J]. AGRICULTURAL AND FOREST METEOROLOGY,2017,233:143-152. |
| APA | Sun, Tao,Fang, Hongliang,Liu, Weiwei,&Ye, Yongchang.(2017).Impact of water background on canopy reflectance anisotropy of a paddy rice field from multi-angle measurements.AGRICULTURAL AND FOREST METEOROLOGY,233,143-152. |
| MLA | Sun, Tao,et al."Impact of water background on canopy reflectance anisotropy of a paddy rice field from multi-angle measurements".AGRICULTURAL AND FOREST METEOROLOGY 233(2017):143-152. |
入库方式： OAI收割
来源：地理科学与资源研究所
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