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首页> 外文期刊>農業気象 >Estimate of rice yield of Japan under the conditions with elevated CO_2 and increased temperature by using third mesh climate data
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Estimate of rice yield of Japan under the conditions with elevated CO_2 and increased temperature by using third mesh climate data

机译：利用第三次网状气候资料估算CO_2升高和温度升高条件下的日本水稻产量

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Rice yield was estimated at all the third mesh points in Japan for the condition of elevated CO_2 concentration and increased temperature with a growth model. Growth parameters of the model for 36 principal Japanese japonica type varieties were employed for the calculation. In cases of the temperature change in -2, +2 and 4 deg C, decrease of the total yield of Japan was estimated to be about -14, -5 and - 12 percent, respectively. Under the conditions with temperature increment of 2 deg C, only rice yield in Hokkaido rose. In central and southern part of Japan, rice yield decreased as the temperature rose, however, the reduction could be avoided by advancing the planting date. Effect of CO_2 concentration on rice yield was incorporated into the radiation use efficiency which was calculated from light-photosynthetic curves of canopies in growth chambers. Rice yields increased from 10 to 15 percent depending on the radiation intensity when CO_2 concentration was elecated from 350ppm to 1200ppm. Under the lower the radiation intensity, the increase of rice yield caused by elevated CO_2 concentration was higher.
机译：在CO_2浓度升高和温度升高的条件下，通过生长模型估计了日本所有第三目网点的水稻产量。该模型的生长参数用于36个主要日本粳稻类型品种的计算。在-2，+ 2和4摄氏度的温度变化的情况下，日本总产量的下降估计分别约为-14％，-5％和-12％。在温度升高2摄氏度的条件下，北海道的水稻产量仅上升。在日本中部和南部，稻米产量随着温度的升高而下降，但是，可以通过推迟播种日期来避免这种下降。 CO_2浓度对水稻产量的影响被纳入辐射利用效率，该辐射利用效率是根据生长室中冠层的光合曲线计算得出的。当CO_2浓度从350ppm升高到1200ppm时，水稻的产量从10％到15％取决于辐射强度。在较低的辐射强度下，CO 2浓度升高引起的水稻产量增加较高。

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