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利用张掖市6个气象观测站1961-2010年实测气温资料,运用5 d滑动平均、气候倾向率、M ann-Kendall检验等方法,对农耕期初日、终日、持续日数及≥0℃积温的分布特征、年际和年代际演变规律及突变特点进行分析,结果表明:张掖市农耕期初日随海拔高度的升高推迟,终日则相反,农耕期日数自西北部向东南缩短,积温南北差异显著;近50 a初日提早,终日推迟,持续日数延长,积温增加趋势明显;20世纪70-80年代前期各地表现出农耕期初日推迟,终日提前,持续日数较短,≥0℃积温偏少的特点;20世纪90年代以来,终日延迟程度大于初日提前程度,积温增加显著,尤其2001-2010年增幅为50 a最大;山前绿洲及荒漠绿洲农耕期终日、持续日数及积温分别在1995/1997年、1982/1990年、1996/1999年发生了突变;农耕期热量资源增加,对作物种植结构的调整、生育进程的加快及产量均产生一定影响.
Based on the measured air temperature data of 6 meteorological stations in Zhangye City from 1961 to 2010, the distribution of the initial and final farming days, the days of persistence and the accumulated temperature of ≥0 ℃ were analyzed by 5-day moving average, climate propensity and M ann-Kendall test Characteristics, interannual and decadal evolution patterns and the characteristics of mutation were analyzed. The results showed that: the initial days of farming in Zhangye were postponed with the elevation increasing; on the contrary, the days of agriculture were shortened from the northwest to the southeast, The early days of the past 50 years were earlier and the later days were delayed, and the duration of days was prolonged. The trend of increase in accumulated temperature was obvious. In the early 1970s and early 1980s, the initial days of farming were postponed, all day long, short days of persistence, Since the 1990s, the final day delay was greater than that of the first day, and the accumulated temperature increased significantly, especially from 2001 to 2010, with a maximum increase of 50 years. The final day, the number of days and the accumulated temperature of the piedmont oasis and desert oasis in 1995 and 1997 , 1982/1990 and 1996/1999. The increase of calorific resources during the farming period had an impact on the crop planting structure adjustment, the growth of the fertility process and the yield.