Retrieval of leaf area index from top-of-canopy digital photography over agricultural crops
Retrieval of leaf area index from top-of-canopy digital photography over agricultural crops
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DOI：
10.1016/j.agrformet.2010.08.002
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发表时间：
2010-10-15
影响因子：
6.2
通讯作者：
Pattey, Elizabeth
中科院分区：
文献类型：
--
作者：
Liu, Jiangui;Pattey, Elizabeth
叶面积指数（LAI）估计从垂直空隙率测量获得冠层顶部的数字彩色摄影在玉米，大豆和小麦冠层。基于直方图的阈值技术被用来分离绿色植被组织从背景土壤和残留物材料，以获得冠层垂直空隙率从数码照片。结果表明，用数字摄影法得到的差距分数与用LAI-2000冠层分析仪得到的漫射非截获度呈线性相关（R-2=0.78）。来自摄影方法的LAI与在不存在衰老的情况下使用LAI-2000（R-2=0.83）测量的LAI相当。我们建议使用数字摄影除了传统的设备来获取农业作物的叶面积指数和间隙分数，因为这种方法是受辐射条件的限制较少，该协议可以很容易地实现广泛的采样，以低成本。皇冠版权所有（C）2010由爱思唯尔B. V.出版保留所有权利。
Leaf area index (LAI) was estimated from vertical gap fraction measurements obtained using top-of-canopy digital colour photography over corn, soybean and wheat canopies. A histogram-based threshold technique was used to separate green vegetation tissues from background soil and residue materials in order to derive the canopy vertical gap fraction from the digital photos. The results show that the gap fraction obtained using digital photography was linearly related with the diffuse non-interceptance obtained with a LAI-2000 plant canopy analyzer (R-2=0.78). LAI derived from the photographic method was comparable to the LAI measured using LAI-2000 (R-2=0.83) in the absence of senescence. We recommend using digital photography in addition to conventional equipment for acquiring LAI and gap fraction of agricultural crops, because the approach is less limited by radiation conditions, and the protocol can easily be implemented for extensive sampling at low cost. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.