Sensitivity of wheat yield to temperature changes with regional sunlight characteristics in eastern Hokkaido
Sensitivity of wheat yield to temperature changes with regional sunlight characteristics in eastern Hokkaido
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DOI：
10.1002/joc.4276
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
S. Shimoda;T. Hamasaki;T. Hirota;H. Kanno;Z. Nishio
中科院分区：
文献类型：
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作者：
S. Shimoda;T. Hamasaki;T. Hirota;H. Kanno;Z. Nishio
从1 km分辨率的天气数据中提取了农田的气温和日照时间，并比较了日本北海道东部邻近的十胜和鄂霍次克地区与冬小麦产量的关系。冬小麦产量的主要气候驱动因子是十胜地区春季和灌浆期的气温，以及鄂霍次克地区灌浆期的日照时数。产量对气温敏感性的区域差异主要是由于灌浆期日照时数的差异。在十胜，较短的灌浆期限制了植物可获得的累积阳光，因为日照时间从6月下旬到7月下旬减少。在鄂霍次克，冬小麦的产量归因于获得充足的阳光，尽管生长期因气温升高而缩短。我们发现，不同的气候驱动因素影响冬小麦产量，即使在相邻地区。冬小麦产量对温度的敏感性可以用4.5h日日照时数作为阈值来确定，而不受地域限制。灌浆期日照时间短，加剧了小麦产量对温度的敏感性。初夏的鄂霍次克的特点是阳光明媚的天气比十胜由于焚风，相对于南风。然后，南风与鄂霍次克日照时间显着延长。区域云的发展影响日照时数作为小麦产量的气候驱动因素。
Air temperature and sunshine duration for agricultural fields were extracted from 1‐km‐resolution weather data, and their relationship with winter wheat yield was compared for the adjacent Tokachi and Okhotsk regions of eastern Hokkaido, Japan. Major climatic drivers of winter wheat yield were air temperature during spring and grain‐filling period in Tokachi, and sunshine duration during grain‐filling period in Okhotsk. The regional difference in the sensitivity of yield to air temperature is attributed to variations in sunshine duration during grain‐filling period. In Tokachi, a shorter grain‐filling period limits the cumulative sunlight available to plants, because sunshine duration declines from late June to late July. In Okhotsk, yields of winter wheat were attributed to receiving adequate sunlight, although the growth period was curtailed by higher air temperature. We found that different climatic drivers affected winter wheat yield even in adjacent regions. The sensitivity of winter wheat yield to temperature can be determined by a threshold of 4.5 h daily sunshine duration regardless of region. Short sunshine duration during the grain‐filling period exacerbated the sensitivity of wheat yield to temperature. Early summer in Okhotsk is characterized by sunnier weather than in Tokachi due to foehn, with respect to the southerly winds. Then, southerly wind was associated with significantly longer sunshine duration in Okhotsk. Regional cloud development affects sunshine duration as the climatic driver of wheat yield.