Change Characteristics of Agricultural Climate Resources of Red Jujube in Qiemo County，Xinjiang in the Last 50 Years

Taking red jujube as research object, using daily meteorological data from 1971 to 2020 in Qiemo County, Xinjiang, Mann-Kendall mutation detection, wavelet analysis, and climate tendency rate methods were used to analyze characteristics of agricultural climate resource changes during growth season of red jujube, providing scientific basis for local red jujube industry to adapt to climate change．Results showed that average temperature and accumulated temperature of ≥10 °C during growing season of red jujube showed a significant increasing trend, with climate tendency rates of 0.36 °C/10 years and 98.4（ °C·d）/10 years, respectively．Significant mutations from less to more occurred in 2003 and 2008, respectively．Change in precipitation was not significant and showed a slight increase trend, with significant interannual fluctuations．Sunshine duration showed a decreasing trend, with a sudden change from more to less in 1981, with a climate tendency rate of 24.4 h/10 years．Number of high temperature days in summer showed an increasing trend, especially in July, with a significant increase rate of 2.0 days per decade．Average daily temperature range in summer was 15.8 °C, and daily temperature range from June to August showed a decreasing trend, but change was not significant．Number of strong wind days and dust days in spring and summer showed a decreasing trend, with a significant decrease in strong wind days and uneven distribution of dust days between years．Under background of climate change, Qiemo County has abundant light and heat resources during growth season of red jujube, with a large daily temperature range, which was generally beneficial for improving yield of red jujube．However, increase in number of high-temperature days during flowering and fruiting period has a certain impact on growth and development of red jujube．