Productivity and radiation use efficiency of lettuces grown in the partial shade of photovoltaic panels
Productivity and radiation use efficiency of lettuces grown in the partial shade of photovoltaic panels
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DOI：
10.1016/j.eja.2012.08.003
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发表时间：
2013-01-01
影响因子：
5.2
通讯作者：
Dupraz, C.
中科院分区：
文献类型：
--
作者：
Marrou, H.;Wery, J.;Dupraz, C.
最近有人提出在同一土地单元上结合光伏板（PVPs）和农作物，作为将农田转变为光伏电站的一种替代方案。这可能会缓解粮食生产和能源生产之间日益激烈的土地竞争。在这种农光互补系统中，上层的光伏板会部分遮挡地面的农作物。这项工作的目的是：（i）评估两种光伏板密度对作物产量的影响，这两种密度导致的遮荫水平分别相当于入射辐射的50%和70%；（ii）确定植物对遮荫反应的形态和生理决定因素。在两个季节里，对四个生菜品种（两个结球生菜品种和两个叶用生菜品种）进行了实验。在所有情况下，收获时生菜的相对产量等于或高于可利用的相对辐射量。在遮荫条件下，生菜产量通过辐射截获效率（RIE）的提高得以维持，而辐射转换效率（RCE）没有显著变化。辐射截获效率的提高可以解释为：（i）尽管叶片数量减少，但单株总叶面积增加；（ii）叶片群体中叶面积的分布不同，遮荫条件下叶片的最大尺寸增加。我们的研究结果为根据品种的形态特征和对光伏板遮荫的生理反应来选择合适的品种提供了一个框架，以优化农光互补系统。（c）2012爱思唯尔有限公司。保留所有权利。
Combining photovoltaic panels (PVPs) and crops on the same land unit were recently proposed as an alternative to the conversion of cropland into photovoltaic plants. This could alleviate the increasing competition for land between food and energy production. In such agrivoltaic systems, an upper layer of PVPs partially shades crops at ground level. The aim of this work was to (i) assess the effect on crop yield of two PVPs densities, resulting in two shade levels equal to 50% and 70% of the incoming radiation and (ii) identify morphological and physiological determinants of the plant response to shade. Experiments were conducted on four varieties of lettuces (two crisphead lettuces and two cutting lettuces), during two seasons. In all cases, the relative lettuce yield at harvest was equal or higher than the available relative radiation. Lettuce yield was maintained through an improved Radiation Interception Efficiency (RIE) in the shade, while Radiation Conversion Efficiency (RCE) did not change significantly. Enhanced RIE was explained by (i) an increase in the total leaf area per plant, despite a decrease in the number of leaves and (ii) a different distribution of leaf area among the pool of leaves, the maximal size of leaves increasing in the shade. Our result provides a framework for the selection of adapted varieties according to their morphological traits and physiological responses to PVP shade, in order to optimize agrivoltaic systems. (c) 2012 Elsevier B.V. All rights reserved.