Ground cover and leaf area index of maize and sugar beet crops
Ground cover and leaf area index of maize and sugar beet crops
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DOI：
10.1051/agro:19970602
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发表时间：
1997-07-01
期刊：
影响因子：
--
通讯作者：
Jaggard, K
中科院分区：
文献类型：
--
作者：
Andrieu, B;Allirand, JM;Jaggard, K
叶面积指数（L）是表征作物生长发育及其与大气交换的重要变量。直接测量是破坏性的和乏味的。L与地被植物C之间的关系可以通过考虑叶角分布和叶簇而解析地描述。由于很难刻画这两个变量，我们研究了L和C之间经验关系的稳定性。地面覆盖测量垂直视图的照片。对于玉米（Zen mays L，var Deal）和甜菜（Beta vulgaris，var马塔多尔），我们发现消光系数（K）在整个作物发育过程中是稳健的，仅受种群密度和播种几何形状的微弱影响。因此，C的测量似乎是一个简单的方法来估计L，一旦关系已经建立了各种感兴趣的，并排除水分胁迫期间，可能会改变作物的几何形状。
Leaf area index (L) is an important variable characterizing the development of a crop and its exchanges with the atmosphere. Direct measurements are destructive and tedious. The relations between L and the ground cover (C) can be described analytically by taking account of leaf angle distribution and leaf clumping. Because it is difficult to characterize these two variables, we have studied the stability of empirical relations between L and C. Ground cover was measured from vertical-view photographs. For both maize (Zen mays L, var Deal and sugar beet (Beta vulgaris, var Matador), we found the extinction coefficient (K) to be robust throughout crop development and only weakly affected by population density and sowing geometry. Thus, measurement of C appears to be a simple way to estimate L, once the relation has been established for the variety of interest, and excluding periods of water stress that may modify crop geometry.