Temporal and Spatial Variation of Low Temperature Injury on Cotton Seedlings in Xinjiang in the Past 60 Years
Low temperature and chilling injury is a major agricultural meteorological disaster restricting cotton production in Xinjiang.Therefore,this research used the daily average air temperature of 46 national basic meteorological stations in the northern,southern and eastern cotton areas of Xinjiang from 1961 to 2022.Combined with the monitoring indices of low temperature and chilling injury in cotton seedling stage.This research analyzed the temporal and spatial variation of mild,moderate and serious low temperature and chilling injury in cotton seedling stage by climate tendency rate,MK mutation test and accumulative anomaly.The aim was to provide scientific basis for rational formulation of disaster prevention and mitigation measures in different cotton areas of Xinjiang.The results indicate that the air temperature at the seedling stage in the cotton area of Xinjiang showed a significant upward trend between 1961 and 2022,with a tendency rate of 0.30℃·10y-1.In 1999,2004,and 2003,the occurrence of mild chilling injury during the seedling stage was less frequent in northern Xinjiang,southern Xinjiang,and eastern Xinjiang,respectively.Similarly,in 2006 and 2008,the frequency of moderate chilling injury during the seedling stage was lower in northern Xinjiang,southern Xinjiang,and eastern Xinjiang.In 1975 and 2003,the cotton areas of northern and southern Xinjiang entered the stage of less occurrence of serious seedling chilling injury.In the past 60 years,the low temperature and chilling injury at seedling stage in Xinjiang occurred more frequently in the 1980s and 1990s.The years of mild and moderate chilling injury accounted for 79.0%and 37.1%of the study period,respectively,and the years of serious chilling injury accounted for only 8.1%.The low temperature and chilling injury at seedling stage mainly in mild and moderate forms,primarily in the northern Xinjiang cotton area,followed by the southern Xinjiang cotton area.The occurrence of low temperature and chilling injury was lowest in eastern Xinjiang.
CottonSeedlingLow temperature and chilling injuryVariationClimate change
NETL
NSTL
万方数据
