Spatial-Temporal Characteristics And Influencing Factors of Climatic Growth Period of Chimonophilous Crop In Hexi Oasis During 1960-2019

Based on the daily average temperature data of 6 meteorological stations in the Hexi Oasis, Gansu Province, where the chimonophilous crop distribution area is located from 1960 to 2019. The spatio-temporal characteristics and influencing factors of the starting and ending days of the growth period, the number of days, and the effective accumulated temperature (Abbreviated as EAT) of the growing period of the chimonophilous crop in the Hexi Oasis was analyzed by Using climate tendency rate, ArcGIS inverse distance weighted interpolation, Mann-Kendall test, Morlet wavelet analysis, principal component analysis and correlation analysis methods, etc. The results show that there are significant differences in the spatio-temporal changes in the climate growth period of the chimonophilous crop in the Hexi Oasis. It shows a trend of decreasing from southeast to northwest, except for Yongchang (the highest elevation and lowest temperature in Yongchang). The M-K test showed that the growth period termination date was the most sensitive response to climate warming. Wavelet analysis shows the climatic growth period changes of cool-loving crops in the study area coincide with the cycles of atmospheric circulation 2-4a, El Niño 2-7a and sunspot activity quasi-11a.The changes are affected not only by 74 atmospheric circulation factors, but also by geographic parameters such as latitude and altitude, and monthly average temperature. This study provides scientific decision-making and basis support for the development of food and crop security and the improvement of the ability to withstand disasters in the Hexi Oasis. At the same time, it is of important theoretical significance and practical value for coping with climate change and proposing countermeasures for disaster prevention and mitigation.