关键词: 粳稻, 粳稻, 沙引发, 冷胁迫, 抗寒性

Abstract: The temporal and spatial change of 2 m air temperature in winter (December, January and February) of Northeast China was analyzed based on the monthly average data from 27 stations during 1961 to 2014 and the method of EOF decomposition was used, the relationship between 2 m temporal and spatial air temperature change and the Pacific Ocean sea temperature and general atmospheric circulationand was studied. The results showed that: the first EOF decomposition mode presented a consistent warming trend of the whole region, especially in Jilin and Heilongjiang Province; the second EOF decomposition mode indicated the anti-phase of temperature in the north and south of this region with significant inter-annual variation characteristics. The relationship with sea temperature showed that the generally warming trend of Northeast China was closely related to the sea temperature in equator-Indian Ocean, and the circulation characteristic showed that a strong polar vortex was found in the upper troposphere, and shrunk in the polar region. There was an anomalous high-pressure ridge in Northeast China which retrained the cold air spread from the polar region to the south. The north-south vibration of temperature in Northeast China was closely related to the sea temperature of equator-Pacific Ocean, the sea temperature of equator-East Pacific Ocean was abnormally warm, which corresponded to the temperature characteristic of high in south and low in north in this region. The circulation feature showed that the cold high was weaker in land, Baikal to Yakutsk showed an obvious trough of low pressure, which was significantly and positively related to the geopotential height of middle latitude Pacific Ocean, and significantly and negatively related to the geopotential height of the northeast to North Pacific Ocean, and significantly and positively related to the geopotential height of upper troposphere and the East Pacific Ocean.