The Response of Seasonally Frozen Soil in Xilinhot to Climate Change
In order to study the change characteristics of seasonally frozen soil and the impact of climate change on frozen soil,daily frozen soil depth and meteorological element data of Xilinhot National Benchmark Climate Station from 1961 to 2021 are used to analyze the interannual and interdecadal variations of maximum frozen soil depth as well as the freezing and thawing date of seasonally frozen soil.Through linear tendency estimation,correlation test,M-K mutation test,and Morlet wavelet analysis,we study the meteorological factors that affect the change of maximum frozen soil depth,and generate a multiple regression equation for frozen soil depth.The results show that the maximum frozen soil depth is shallowing at the speed of-1.75 cm/(10 a),with the V-shaped distribution of interdecadal variation.The average depth of frozen soil was the deepest in the 1970s,while it was the shallowest in the 1990s,thus showing a deep-shallow-deep variation for the overall distribution trend.Sudden strong changes were identified in frozen soil depth during 1983-1988,with the main cycle of the maximum frozen soil depth as 28 a;The overall change in the freezing date of frozen soil is not significant,while the melting date tends to advance.The maximum frozen soil depth is significantly negatively correlated with the annual average temperature,the average minimum temperature,and the average 40 cm soil temperature,indicating that the temperature and 40 cm soil temperature are the key meteorological factors affecting the change of seasonally frozen soil depth.The formulation of the multiple regression equation can be used to predict the frozen soil depth in Xilinhot so as to provide service for production and livelihood activities related to the frozen soil,such as the construction of local railways and the laying of heating pipelines.Meanwhile,the study of the response of the frozen soil depth to climate change is of great significance to the targeted agricultural and animal husbandry production with appropriate deployment of climate resources and to the promotion of the sustainable development of grassland ecology.
climate changeseasonally frozen soilresponseprairie area in Xilinhot
万方数据
维普
