Temporal and Spatial Comparison of Agricultural Heat Resources Before and After Temperature Abrupt Change in Qaidam Basin in Recent 60 Years
Based on the daily average temperature data of the National Surface Meteorological Observatory in the Qaidam Basin from 1961 to 2020,the linear trend,cumulative anomaly method,sliding t-test,Mann-Kendall trend and mutation test were used to analyze and discuss.The results showed that the abrupt change in the annual average temperature in the Qaidam Basin in the past 60 years was 1997.Before the abrupt change,the mean average temperature of the Qaidam Basin increased,the extreme difference had decreased,and the coefficient of variation had decreased.After the abrupt change,these trends continued.This indicated that the temperature had been tending to increase steadily with a higher value after the abrupt change.The accumulated temperature of>0℃,>5℃ and>10℃ both before and after the sudden change in temperature showed that the average values had increased,the climate tendency rates had decreased,and the coefficients of variation had decreased,which were consistent with the changes before and after the sudden change of average temperature.The trends of the accumulated temperature days at>0℃,>5℃,and>10℃ had been different before and after the sudden temperature change.From the correlation observed between accumulated temperature and the number of accumulated temperature days with average temperature,it was seen that the accumulated temperature of>0℃ and the average temperature of each element had shown the strongest significant positive correlation in each period.This was followed by the accumulated temperature of>5℃,the number of accumulated temperature days of>0℃,the number of accumulated temperature days of>5℃,and the accumulated temperature of>10℃.The spatial distribution of the climatic inclination rate of agricultural heat resources in the Qaidam Basin before and after the abrupt temperature change years was not significant in most areas.The center of the large value had shifted from the western part of the basin to the central and eastern part of the basin in terms of accumulated temperature and accumulated temperature days,both before and after the sudden change.Among the seven selected caloric resource elements,the absolute values of the climatic tendency rate of 4 elements decreased after the sudden change in temperature compared to those before the sudden change.The climatic tendency rates of the average temperature,>0℃ accumulated temperature,>5℃ accumulated temperature,>0℃ accumulated temperature days,and>5℃ accumulated temperature days in most parts of the Qaidam Basin had been positive both before and after the sudden temperature change.The characteristics of climate tendency rate at>10℃ and the number of days with accumulated temperature at>10℃ before and after the sudden change temperature were different from those of other factors.The analysis results had important reference significance for guiding the development planning and layout of ecological characteristic agriculture in the Qaidam Basin,and the rational development and utilization of heat resources.
万方数据
维普
