关键词: 国际抗冷圃, 国际抗冷圃, 寒地, 抗冷性, 水稻标准评价体系

Abstract: To analyze characteristics and its influencing factors of main growth stages of winter wheat, the correlation, integral regression methods were used based on the data of main growth stages in 13 winter wheat agrometeorological observational stations in Shanxi province. The results showed that: 1) Between observational stations, the interval of sowing date was the shortest and it of turning green date was the longest on average.2)In south and middle part of Shanxi province, whether winter wheat could be sowed or not, it depended on when rain would be across these area in autumn. The southeastern Shanxi often enjoyed their rainy weather in autumn, so meet temperature was important for sowing. 3) Other dates of main growth stages, expect sowing date, were related with latitude and altitude. The lower latitude and altitude were, the later date of overwintering came, but it was opposite for the dates of turning green, jointing, heading and maturing. Impact of altitude was more marked than that of latitude.4) The dates of jointing and heading had seen a forward trend, especially heading. This was caused by the warmer and warmer winter and spring. 5) Temperature change in different stages of the whole winter wheat growth season would bring on different impact to dates of jointing and heading. In south, middle, and southeast part of Shanxi, to the date of jointing, the key period was from the first ten-day to the middle ten-day of March, the last ten-day of March to the middle ten-day of April, and the last ten-day of September, respectively. If temperature would rise by 1℃, this would bring the date of jointing forward for 0.6d,0.5-0.8d,and 0.5d, respectively. For the date of heading, it was the first ten-day of April, the last ten-day of April to the middle ten-day of May, and the last ten-day of April to the first ten-day of May, respectively. And the date of heading would be forward for 0.5d, 1-2d and 1d,respectively.