ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Construction and Spatial-Temporal Characteristics of the Intensity Index of Low-Temperature Freezing Injury on Winter Wheat in Jiangsu Province
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Abstract:
Constructing a quantitative index to characterize the intensity of low-temperature freezing injury on winter wheat and revealing its spatial-temporal variation characteristics is crucial for scientific prevention of low-temperature freezing injury of winter wheat. Based on daily meteorological observation data of winter in Jiangsu Province from 1972 to 2022, disaster data of freezing injury on winter wheat from 2010 to 2022, and yield data of historical extreme freezing injury years, the impact weights of causing factors on different types of freezing injury were determined, and three main types of freezing injury indices were established: low-temperature freezing injury(November to March), freezing injury during overwintering period(Late December to mid February), and freezing injury during regreening-jointing period(Late February to March). Multiple mathematical statistical methods such as Mann-Kendall mutation test and k-means clustering were used to conduct spatial-temporal analysis and evaluation of low-temperature freezing injury on winter wheat. Based on the ranking of freezing injury intensity during overwintering period and regreening-jointing period, two types of freezing injury are classified into three levels respectively: mild, moderate and severe. The results show that there is a significant difference in the intensity index of low-temperature freezing injury between the north and south of Jiangsu Province, which can be divided into high-risk zones (Xuzhou, Lianyungang, Suqian, Huaian, Yancheng), medium-risk zones (Nanjing, Yangzhou, Taizhou, Nantong), and low-risk zones (Zhenjiang, Changzhou, Suzhou, Wuxi). Over the past 51 years, the intensity index of low-temperature freezing injury on winter wheat experienced a sudden decline in 1989 in Jiangsu Province. The severe freezing injury during overwintering period and regreening-jointing period both jumped from a relatively multi period to a relatively low period in the late 1980s. Although the frequency of freezing injury during the growth period of winter wheat shows a decreasing trend, the intensity of extreme freezing injury is increasing, and even the freezing injury index in some areas exceeded the historical record of 1977 in the 21st century.
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