| 摘要: |
| 采用数理统计方法对河西走廊中部六县（区）1961—2009年逐日实测气温资料进行分析，分析≥10℃界限温度分布特征、年际和年代际演变规律及其异常变化特点，并分析≥10℃界限温度的演变对当地主导作物玉米的种植结构、生长性状及产量等的影响，结果表明：近50 a河西走廊中部≥1O℃界限温度表现为初日提早、终日推迟、持续日数延长、积温增加的趋势；20世纪70年代至80年代前期各地≥1O℃积温偏少，持续日数较短，90年代以来，积温增加趋势明显，尤其2001—2009年增加幅度为近50 a最大，热量资源充足；70年代、80～90年代初均出现积温异常偏少、持续日数异常偏短的年份，2000—2009年，河西走廊中部≥10℃积温异常偏多的年份占近50 a来异常偏多年份的83%；生长季≥10℃热量资源显著增加，利于扩大河西走廊中部主导作物玉米的种植面积和区域，提高了玉米单产及总产产量。 |
| 关键词: ≥10℃积温 空间分布 年代际变化 玉米生产 河西走廊中部 |
| DOI： |
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| 基金项目:甘肃省气象局科研项目（2013-19）；张掖市气象局科研项目 |
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| Evolvement of critical temperature on ≥10℃ limit and its effect on maize production in central Hexi Corridor |
| YIN Xue-lian1, HE Jin-mei2, GUO Ping-ping1 |
| () |
| Abstract: |
| Based on the daily air temperature data of six counties of Zhangye in the central Hexi Corridor from 1961—2009, analysis was made of the spatial distributions, annual and decadal variations and climatic anomalous change year of the critical temperature≥10℃, as well as the effect of its evolvement on crop planting pattern, growth situation and maize output. The results are as follows: During the last 50 years, the variation trend of the critical temperature ≥10℃ presents the characteristics of the initial day becoming earlier, terminalday postponing, duration prolonging and the accumulated temperature increasing. In the 1970s—1980s, the phenomena of the accumulated temperature ≥10℃ decreasing and duration shortening occurred in most of the weather stations in the central Hexi Corridor; in the 1990s, the accumulated temperature increased obviously, and the increase extent in the years of 2001—2009 is the highest the last 50 years; and the phase of thermal abundance appeared. In the beginning of 1970s—1990s, the anomaly phenomena of the accumulated temperature≥10℃ decreasing and duration shortening occurred in most of the weather stations. During the period of 2000—2009, the anomalous increase years of critical temperature ≥10℃ accounted for 83% of the total in the last 50 years. The anomalous increase years, accumulated temperature ≥10℃ and thermal resources increased remarkably in maize growing period, which was helpful for enlarging planting area of the dominant crop maize, raised the yield of maize per unit area and the general output. |
| Key words: cumulative temperature ≥10℃ spatial distribution decadal variation maize production central Hexi Corridor |
