关键词: 下位机, 下位机

Abstract: In order to maximize use of natural resources and reasonably arrange agricultural production in the background of climate warming, based on the meteorological data in 9 counties in Weifang during 1961-2010, and using linear climate tendency rate, Mann-Kendall nonparametric test and Morlet wavelet analysis methods, the agro-climate resources in Weifang were investigated. The results showed that: except for ≥20℃ accumulated temperature (AT), other boundary temperature ATs increased significantly, with a growth rate of 55.6-77.3℃?d/10 a. The precipitation between the initial and final date of every boundary temperature tended to decrease, but the decreasing trend was not significant. The interval days between the initial and final date of ≥0℃ and ≥10℃ and the frost-free period increased significantly by 4.8 d/10 a,2.6 d/10 a and 2.3 d/10 a. The mutation happened to ≥0℃ and ≥10℃ ATs around 1994, ≥5℃, ≥15℃ and ≥20℃ ATs arounded 1998. The precipitation between the initial and final date of every boundary temperature had no significant abrupt change point. The abrupt change happened to the interval days between the initial and final date of ≥0℃ and ≥10℃ and the frost-free period arounded 1991, 1996 and 2004. Except for ≥20℃ AT and precipitation between the initial and final date of every boundary temperature, there prevalently existed a period change of 6-year time scale for other boundary temperature ATs, and 6-8 years time scale for the frost-free period.