Predicting yield losses caused by lodging in wheat
Predicting yield losses caused by lodging in wheat
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DOI：
10.1016/j.fcr.2012.07.019
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发表时间：
2012-10-20
影响因子：
5.8
通讯作者：
Spink, J.
中科院分区：
文献类型：
--
作者：
Berry, P. M.;Spink, J.
倒伏是小麦产量的主要限制因素，但很少有研究探讨其减产机制。本文检验了这一假设，即小麦倒伏引起的产量损失可以通过计算减少冠层光合作用，结果从倒伏引起的冠层结构的变化来预测。现有的冠层光合作用模型已被进一步发展，以解释倒伏引起的冠层结构变化对光合作用和产量的影响。该模型预测，在垂直方向90 °处倒伏将使产量减少约61%。该模型预测倒伏引起的产量损失的能力进行了测试，在三个独立的田间试验中所作的观察。该模型预测了71%的因倒伏而损失的产量比例（Y-LOSS）的变化，最佳拟合线与1：1关系无显著差异。敏感性分析表明，产量损失比例对模型参数相对不敏感。结果表明，可以采用简化的模型，而不会损失预测精度。Y-LOSS = Sigma（f）（i）（L-90 × 0.7 + L-65 × 0.3 + L-25 × 0.1）/n在该方程中，i和f是籽粒灌浆的第一天和最后一天，L-90是与垂直方向成85-90度的作物面积的比例，L-65是在46和84度之间倒伏的作物面积的比例，L-25是在5和45度之间倒伏的作物面积的比例，n是籽粒灌浆的天数。(c)2012爱思唯尔有限公司版权所有。
Lodging is a major limiting factor for wheat (Triticum aestivum L) production, yet few studies have investigated the mechanism by which it reduces yield. This paper tests the hypothesis that lodging-induced yield losses in wheat can be predicted by calculating the reduction in canopy photosynthesis that results from lodging-induced changes to the architecture of the canopy. An existing model of canopy photosynthesis has been further developed to account for the effect of lodging-induced changes to the canopy architecture on photosynthesis and grain yield. The model predicted that lodging at 90 from the vertical will reduce yield by approximately 61%. The ability of the model to predict lodging-induced yield losses was tested against observations made in three separate field experiments. The model predicted 71% of the variation in the proportion of yield lost due to lodging (Y-LOSS) and the best-fit line was not significantly different from the 1:1 relationship. Sensitivity analysis showed that the proportion of yield lost was relatively insensitive to the model parameters. As a result it was shown that a simplified model could be employed without losing predictive accuracy. Y-LOSS = Sigma(f)(i) (L-90 x 0.7 + L-65 x 0.3 + L-25 x 0.1)/n In this equation i and f are the 1st and last days of grain filling, L-90 is the proportion of crop area lodged at 85-90 degrees from the vertical, L-65 is the proportion of crop area lodged between 46 and 84 degrees L-25 is the proportion of crop area lodged between 5- and 45 and n is the number of days of grain filling. (c) 2012 Elsevier B.V. All rights reserved.