关键词: 双季晚稻, 低温冷害, 主成分, 评价指标

Abstract: In order to grasp the occurrence regularity of low temperature chilling injury in double-cropping late rice in Quzhou city, based on the daily meteorological data from 1951—2018 in Quzhou city, starting with meteorological factors, using principal component analysis to find two principal components and establishing an index evaluation model; the clustering segmentation method was used to rank the indices. The statistical results showed that the frequency of low-temperature chilling damage in the autumn of double-cropping late rice from 1951 to 2018 occurred once in two years, the strongest in the 1950s, and the lightest in the 1960s; there were mostly mild disasters in the 1980s and 2000s; the damage intensity was weak in the 1990s and 2010s. In 1953, 1970 and 1973, low temperature chilling damage was more serious. The climate of the double-cropping late rice with severe cold damage is also obviously abnormal, and it is related to the decrease of the yield of double-cropping late rice. The more severe autumn low temperature and cold damage shows a significant decrease in production. In the years with severe cold damage in autumn, the double-cropping late rice has significantly reduced yield. It is feasible to evaluate low temperature chilling damage of double cropping late rice at the heading stage in Quzhou using principal component analysis and index evaluation analysis method.

Key words: double cropping late rice, low temperature chilling injury, principal component, evaluation index