Modelling the effects of heat stress on post-heading durations in wheat: A comparison of temperature response routines
Modelling the effects of heat stress on post-heading durations in wheat: A comparison of temperature response routines
复制标题
模拟热应激对小麦抽穗后持续时间的影响：温度响应程序的比较
DOI：
10.1016/j.agrformet.2016.03.006
复制
发表时间：
2016-05-28
影响因子：
6.2
通讯作者：
Zhu, Yan
中科院分区：
文献类型：
--
作者：
Liu, Bing;Liu, Leilei;Zhu, Yan
作物产量模拟与生殖阶段持续时间模拟高度相关，生殖阶段持续时间模拟经常受到热胁迫的影响。在这项研究中，我们评估了四个广泛使用的小麦物候温度响应程序（双线性，正弦，贝塔和梯形程序），以模拟热胁迫对抽穗后持续时间的影响，数据集来自四年的环境控制人工气候室实验和多年的田间试验在中国小麦主产区。在人工气候室实验中，随着热胁迫的增加，抽穗后持续时间显着减少。嵌入在WheatGrow模型中的这些温度例程的比较表明，三个例程不能预测抽穗后持续时间在热应力下，而梯形例程往往高估高温的影响。因此，不能模拟热应激效应的三个例程通过衰老加速功能进行扩展。该功能显着提高了抽穗后持续时间模拟热应力下，无论原来的温度例程。然而，启动衰老加速功能的温度阈值根据原始温度响应程序而变化，在27.3和30.1摄氏度之间。引入了一个新的基因型系数，代表了品种对热胁迫的敏感性，其范围为每天无热影响衰老的1.4 ~ 5.7倍。当评估与独立的物候数据（130次测量）的增加衰老加速功能相关联的三个温度响应例程时，导致抽穗后持续时间的平均RMSE为2.2天。改进的抽穗后持续时间模拟对于模拟当前由于频繁的高温事件而导致的年度间产量变化非常重要，对于气候变化影响评估甚至更为关键。(C)2016爱思唯尔B. V.保留所有权利。
Crop yield simulations are highly correlated to reproductive phase duration simulations, which are often affected by heat stress. In this study, we evaluated four widely used temperature response routines of wheat phenology (Bilinear, Sin, Beta, and Trapezoidal routines) to simulate heat stress effects on post heading durations with datasets from four years of environment-controlled phytotron experiments and multi-year field experiments across the main wheat production region in China. Significant reductions in post-heading duration were observed with increasing heat stress in phytotron experiments. A comparison of these temperature routines imbedded in the WheatGrow model showed that three of the routines could not predict post-heading durations under heat stress, while the Trapezoidal routine tended to overestimate high temperature impacts. Therefore, the three routines that could not simulate heat stress effects were extended by a senescence acceleration function. This function significantly improved the post-heading duration simulations under heat stress, regardless of the original temperature routine. However, the temperature threshold of initiating the senescence acceleration function varied depending on the original temperature response routine, between 27.3 and 30.1 degrees C. A new genotypic coefficient representing a cultivar-specific sensitivity to heat stress was introduced and ranged from 1.4 to 5.7 times of none heat-affected senescence per day. When evaluating the three temperature response routines linked with the added senescence acceleration function with independent phenology data (130 measurements), resulted in an average RMSE of 2.2 days for post-heading duration. The improved post-heading duration simulation is important for simulating current year-to-year yield variability due to frequent heat events, and it is even more critical for climate change impact assessments. (C) 2016 Elsevier B.V. All rights reserved.