关键词: 生态安全, 生态安全, PSR模型, 都市农业, 兰州

Abstract: The daily observational data of sunshine hours at 78 stations in Anhui during the period of 1961-2015 were used to analyze the variation of spring sunshine hours in Anhui and provide the basis for farming arrangements. The variation of the spring sunshine hours in Anhui was analyzed by the methods of correlation analysis, linear tend analysis, Mann-kendall test and Morlet wavelet analysis etc. The study indicated that, the annual average sunshine hours in the spring of Anhui province were between 381.55 and 626.75 hours, increasing from the south to the north of spatial distribution characteristics. The interannual variation of sunshine hours in spring were obvious. The most yearly sunshine hours were 1.7 times more than the least yearly sunshine hours. The change trend of sunshine hours was first decrease and then increase in recent 55 years. There are differences in the duration of sunshine hours. The periodicity of sunshine hours per decade was different. The change trend of sunshine hours from decreasing to increase in the 21st century which was a mutation phenomenon. The spatial distribution of that change trend of spring sunshine hours in Anhui had obvious spatial difference.The sunshine hours had a upward trend in the Huaibei region and a half increase over the Yangtze-Huaibei basin, the trend in the Jiangnan region and along the Yangtze river were mainly increasing.