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首页> 外文会议>International Conference on Sustainable Development >Weather Conditions Associated with Corn Simulated Yield in the Corn Belt of Northeastern China during the Past Three Decades
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Weather Conditions Associated with Corn Simulated Yield in the Corn Belt of Northeastern China during the Past Three Decades

机译：中国东北三十年来中国东北玉带中玉米模拟产量的天气条件

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The Corn Belt of Northeastern China (CBNC) accounts for about 35% of the nation' corn production in China. In the past three decades, corn yield in CBNC have increased under changing in climate and crop management. It is important to investigate the contribution of these changing factors to the historical yield increases to improve our understanding of how we can ensure increased yield in the future. In this paper we conducted correlation and regression analyses of climate and simulated corn yield over the period 1980 to 2011 in CBNC. It was found that over three decades, the daily mean, minimum temperature and growing degree days (GDD) per ten year increased at a rate of 0.37°C, 0.47°C and 51°C, respectively. In contrast, the relative humidity and daily mean wind speed decreased gradually at a rate of 0.18 and 1.8 km day~(-1), respectively. Not significant change in precipitation was found, although differences between years were large. The daily minimum temperature and solar radiation were the dominant factor to corn potential production. According to a regression analysis of the corn potential yield and the climate factors, the results indicate that corn potential yield decreased 1010 and 1314 kg ha~(-1) for each 1°C increase growing season mean and minimum temperature, respectively; rain-fed yield declined 2819 and 2437 kg ha~(-1) for each increase 1°C growing season mean and maximum temperature, respectively. To further improve the potential yield of corn in the coming decades, efforts should be paid to break the potential ceiling reduce the yield gaps by breeding higher yield variety and introduction of new agricultural technology.
机译：中国东北部（CBNC）的玉米腰带占全国玉米产量的35％。在过去的三十年中，CBNC中的玉米产量在气候和作物管理方面的变化下降。重要的是要调查这些不断变化因素对历史产量的贡献，以提高我们对未来的增加的理解。本文在CBNC中，我们在1980年至2011年期间进行了气候和模拟玉米产量的相关性和回归分析。发现，每十年的三十年，每日平均值，最低温度和生长度（GDD）分别以0.37°C，0.47°C和51°C的速率增加。相反，相对湿度和每日平均风速分别以0.18和1.8 km天〜（-1）的速率逐渐降低。发现了降水的显着变化，尽管年之间的差异很大。每日最低温度和太阳辐射是玉米潜在生产的主要因素。根据玉米潜在产量和气候因素的回归分析，结果表明，每个1°C分别增加1010和1314千克HA〜（-1）分别增加生长季节和最小温度;每次增加1°C增长季节和最高温度，雨馈收益率下降2819和2437千克HA〜（-1）分别增加。为了进一步提高玉米的潜在产量在未来几十年中，应努力打破潜在的天花板，通过育种更高的产量品种和引入新的农业技术来降低产量差距。

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