【摘要】 本文通过对河北省唐山、栾城、肥乡三个代表站近23年的观测资料统计分析,结果表明:从20世纪90年代以来,河北省冬春季升温明显,北部地区比南部地区年升温率高;冬小麦90年代以后比80年代播种期推迟2-5d,成熟期提早1-2d,生育期缩短2-7d;三叶~返青间隔日数缩短,其他发育期间隔日数延长,以北部麦区表现明显。通过对发育期和温度的相关分析,冬前≥500℃积温初日推迟2~3d,受冬春季2~5月份平均气温升高的影响,致使发育期及发育期间隔日数发生变化。更多还原

【Abstract】 Through the analysis of observational data from Tangshan,Luancheng and Feixiang over the last 23 years,the study shows: since 90s of last century the increase of winter and spring temperature in Hebei was obvious,and the trend was more obvious in the north;compared with 80s,the seedtime of winter wheat in 90s was postponed for 2 to 5 days,the harvest time was earlier by 1 to 2 days,the generational period shortened by 2 to 7 days,the interval between the-third-leaf and turning–green shortened,and the intervals between other growing period elongated with more obvious trend in the north.Correlation analysis between growing periods and temperature suggested that the end of accumulated temperature above 500℃ before winter was postponed for 2 to 3 days,and the increased the average temperature from February to May caused the changes of growing periods and the intervals between.更多还原