Integrated micrometeorology model for panicle and canopy temperature (IM2PACT) for rice heat stress studies under climate change
Integrated micrometeorology model for panicle and canopy temperature (IM2PACT) for rice heat stress studies under climate change
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DOI：
10.2480/agrmet.67.4.8
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发表时间：
2011-03
影响因子：
1.3
通讯作者：
M. Yoshimoto;Minehiko Fukuoka;T. Hasegawa;M. Utsumi;Y. Ishigooka;T. Kuwagata
中科院分区：
文献类型：
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作者：
M. Yoshimoto;Minehiko Fukuoka;T. Hasegawa;M. Utsumi;Y. Ishigooka;T. Kuwagata
预计全球变暖将增加水稻（Oryza sativa L.）热诱导小穗不育（HISS）的发生。先前的室内实验表明，HISS可能发生在开花时的温度超过约35°C的阈值温度的地方。然而，由于水稻冠层的热条件与田间气温不同，因此HISS的发生很难预测。为了科普这个问题，我们开发了一个简单的微气象模型，重点是冠层和穗温度; IM 2PACT（穗和冠层温度的综合微气象模型）作为一个工具，被纳入一般气象数据库。通过叶片蒸腾延迟（RT）试验对IM 2PACT进行了验证。在开花期，RT处理提高了叶温，引起冠层内空气的升温和干燥，导致穗温升高。IM 2PACT模型能较好地模拟RT试验，不仅能模拟Tp的大小，而且能模拟冠层内微气象变化对叶片蒸腾特性Tp的影响。将IM 2PACT应用于基于ANEMOS的气象数据集，以分析2007年极端炎热夏季关东和东海地区的Tp。由于气象条件的差异，尤其是相对湿度的差异，使得穗温差异在空间上与日最高气温存在较大的差异。这强烈表明，我们必须参考Tp而不是日最高气温，作为HISS的测量变量。IM 2PACT是气候变化影响研究中阐明Tp的有力工具，可以在作物对热敏感的响应与气象数据之间架起一座桥梁。
Projected global warming is expected to increase the occurrence of heat-induced spikelet sterility (HISS) of rice (Oryza sativa L.). Previous chamber experiments have shown that HISS can occur where temperature at flowering time exceeds the threshold temperature of around 35°C. The occurrence of HISS is, however, difficult to predict because the thermal conditions of rice canopy can be different from the air temperature under field condition. To cope with this, we developed a simple micrometeorology model focusing canopy and panicle temperatures; IM2PACT (Integrated Micrometeorology Model for Panicle And Canopy Temperature) as a tool to be incorporated into general meteorology databases. The IM2PACT was validated by leaf transpiration retarding (RT) experiment. During their flowering stage, leaf temperature elevated by RT treatment, which caused warming and drying of the air inside the canopy, resulting in the elevation of the panicle temperature (Tp). The IM2PACT well simulated the RT experiment, and was proved to simulate not only the Tp magnitude but also the effects on Tp of leaf transpiration characteristics via changes in micrometeorology inside the canopy. The IM2PACT was applied to the meteorology dataset based on ANEMOS in order to analyse the Tp at Kanto and Tokai regions of extremely hot summer in 2007. There was a great gap in spatial distributions between the Tp and the daily maximum air temperature which is commonly used as a measure of HISS, because the difference of meteorology, especially relative humidity, among areas altered the panicle-air temperature difference. This strongly suggests that we must refer to the Tp instead of the air temperature in daily maximum, as a measure variable for HISS. The IM2PACT is a powerful tool to elucidate the Tp in the climate change impact study to bridge between the responses of crop susceptible to heat and the meteorological data.