An analysis of factors determining spatial variable grain yield of winter wheat
An analysis of factors determining spatial variable grain yield of winter wheat
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DOI：
10.1016/j.eja.2013.08.005
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发表时间：
2014-01-01
影响因子：
5.2
通讯作者：
Kage, Henning
中科院分区：
文献类型：
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作者：
Johnen, Tobias;Boettcher, Ulf;Kage, Henning
在德国西北部温带气候条件下，利用3年的田间试验资料，分析了土壤水分供应、作物冠层动态、辐射截获、土壤水分平衡组成与冬小麦产量的关系。建立了土壤水分平衡动态模型，并结合冠层参数的频繁测量，对水分平衡和辐射截留部位进行了具体估算。土壤质地和土壤水分供应特性的差异，再加上不同的冠层动态，导致了土壤水分收支和产量的辐射截获、组成和产量的显著差异。以实际蒸腾速率与潜在蒸腾速率之比修正干旱胁迫后的截获光合作用有效辐射之和，在三个试验年份中与粮食产量呈唯一的正相关。用饱和亏差归一化的产量与实际蒸腾量也呈正相关，但不同年份的斜率不同。预测粮食产量的最佳因子是实际蒸腾量与潜在蒸散量之和的比值。我们还可以表明，干旱胁迫校正的辐射截获和5月底评估的Sigma T-a/Sigma ETP的比率已经与最终粮食产量显着相关。这可能会为改善特定地点的作物管理提供选择。(C)2013爱思唯尔B.V.保留所有权利。
We analyzed under the temperate weather conditions of northwest Germany the relationships between soil water supply, crop canopy dynamics, radiation interception, components of the soil water balance and grain yield of winter wheat using data obtained from field experiments during three years. A dynamic model of the soil water budget in combination with frequent measurements of canopy parameters thereby was used to estimate the components of the water balance and radiation interception site specifically. Differences in soil texture and soil water supply characteristics in combination with variable canopy dynamics lead to substantial differences in radiation interception, components of the soil water budget and yield. The sum of intercepted photosynthetic active radiation corrected for drought stress by the ratio of actual to potential transpiration showed a unique positive correlation to grain yield over the three experimental years. Positive correlations between grain yield and actual transpiration normalized by saturation deficit were also found, however, the slopes differed between years. The best predictor of grain yield was the ratio of the sum actual transpiration to the sum of potential evapotranspiration. We could also show that drought stress corrected radiation interception and the ratio Sigma T-a/Sigma ETp evaluated at end of May already correlated significantly with final grain yield. This may offer options for improved site specific crop management. (C) 2013 Elsevier B.V. All rights reserved.