Radiation interception, radiation-use efficiency and dry matter partitioning in garlic (Allium sativum L.)
Radiation interception, radiation-use efficiency and dry matter partitioning in garlic (Allium sativum L.)
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DOI：
10.1016/s1161-0301(02)00094-1
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发表时间：
2002-12-01
影响因子：
5.2
通讯作者：
Orgaz, F
中科院分区：
文献类型：
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作者：
Rizzalli, RH;Villalobos, FJ;Orgaz, F
尽管大蒜（Allium sativum L.）在蔬菜作物中很重要，但目前关于作物生长和产量的生理决定因素的信息很少。这项工作的目的是确定大蒜作物模型在辐射拦截、辐射利用效率 (RUE) 和干物质 (DM) 分配方面的主要组成部分。实验数据（辐射拦截、叶面积指数（LAI）和生物量）是在 1999-2000 年期间在科尔多瓦（西班牙）种植的两种大蒜经济作物中收集的。将椭圆体叶角分布的参数拟合到测量的光透射率，显示出相当垂直的叶子分布，并且叶子元素呈丛集分布。开发了辐射拦截模型并通过独立测量进行验证。然后使用该模型来估计不同 LAI 和太阳角度条件下大蒜的消光系数。计算得出的RUE在生长季的大部分时间约为2.9 g (MJ PAR)(-1)，但在开始和结束时较低，全季平均值约为2.0 g (MJ PAR)(-1)。 DM的划分显示出四个不同的阶段，主要是叶、假茎、叶中的储存和球茎的生长。由于丁香生长速度快，收获指数约为 0.55，这也得益于来自储存器官的碳水化合物的转移。 (C) 2002 Elsevier Science B.V. 保留所有权利。
Despite the importance of garlic (Allium sativum L.) among vegetable crops, very little information is currently available on the physiological determinants of crop growth and yield. The objective of this work was to determine the main components of a garlic crop model in terms of radiation interception, radiation-use efficiency (RUE) and dry matter (DM) partitioning. Experimental data (radiation interception, leaf area index (LAI) and biomass) were collected in two commercial crops of garlic grown in Cordoba (Spain) during 1999-2000. The parameters of an ellipsoidal leaf angle distribution were fitted to measured light transmissivity, showing a rather vertical leaf distribution with clumped distribution of foliage elements. A model of radiation interception was developed and validated with independent measurements. The model was then used to estimate the extinction coefficient of garlic, for diverse conditions of LAI and sun angle. Calculated RUE was around 2.9 g (MJ PAR)(-1) for most of the growing season, but it was lower at the start and at the end, with whole-season average value around 2.0 g (MJ PAR)(-1). Partitioning of DM showed four distinct phases with predominant growth of leaves, pseudostem, storage in leaves and bulbs. Harvest Index was around 0.55 due to the large clove growth rate, which was also supported by translocation of carbohydrates from storage organs. (C) 2002 Elsevier Science B.V. All rights reserved.