Estimation of leaf area index in onion (Allium cepa L.) using an unmanned aerial vehicle
Estimation of leaf area index in onion (Allium cepa L.) using an unmanned aerial vehicle
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DOI：
10.1016/j.biosystemseng.2013.02.002
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发表时间：
2013-05-01
影响因子：
5.1
通讯作者：
Moreno, Miguel A.
中科院分区：
文献类型：
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作者：
Corcoles, Juan I.;Ortega, Jose F.;Moreno, Miguel A.
叶面积指数（LAI）是农学上最常用的指标之一，是一个与生理过程相关的参数。冠层盖度和结构与叶面积指数有关，影响作物与环境的相互作用。目的是评估一种使用无人机（UAV）测量洋葱作物冠层覆盖度的非破坏性方法。2010年灌溉季，在一个商业洋葱小区采用中心支点灌溉系统进行了田间试验。为了确定8个试验田的叶面积，进行了多次数据采样。在这些地块中，使用垂直起降（VTOL）四旋翼飞机拍摄了航空照片。利用为本研究开发的软件获得了冠层盖度（CC）。LAI的最大值代表了56%的CC，这对于该作物的特性来说是很高的。利用三个模型分析了叶面积指数与冠层盖度的关系。结果表明，这两个参数之间的线性关系在生长早期比在较晚期更为明显。对于线性模型，它最能拟合所有生长阶段；CC与LAI的斜率为2.877，决定系数为0.837。(c) 2013 i同意。Elsevier Ltd.出版。版权所有。
Leaf area index (LAI) is one of the most common indices in agronomy, being a parameter associated with physiological processes. Canopy cover and structure are related to LAI and they have effects on the interaction between crops and the environment. The aim was to evaluate a non-destructive method to measure canopy cover in an onion crop using an unmanned aerial vehicle (UAV). A field experiment was conducted in a commercial onion plot irrigated with a centre pivot system during the 2010 irrigation season. Several data sampling events were carried out in order to determine leaf area in eight experimental plots. In each one of these plots, aerial photographs were taken using a vertical take-off and landing (VTOL) quadrotor aircraft. Canopy cover (CC) was obtained by means of software developed for this study. The maximum value of LAI represents a CC of 56%, which is high for the characteristics of this crop. Three models were used to analyse the relationship between leaf area index and canopy cover. According to the results, a more linear relationship was found between both parameters during early growth stages than during more advanced stages. For the linear model, which best fitted all growth stages; the slope that relates CC with LAI was 2.877 with a coefficient of determination of 0.837. (c) 2013 IAgrE. Published by Elsevier Ltd. All rights reserved.