| 杨晓华,杨小利.基于Z指数的陇东黄土高原干旱特征分析[J].干旱地区农业研究,2010,28(3):248~253 |
| 基于Z指数的陇东黄土高原干旱特征分析 |
| Aridity characteristics in East Gansu's loess plateau area based on Z index analysis |
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| DOI：10.7606/j.issn.1000-7601.2010.03.45 |
| 中文关键词: 干旱 Z指数 气候特征 陇东黄土高原 |
| 英文关键词:arid Z index climatic characteristics loess plateau in East Gansu |
| 基金项目:甘肃省气象局2009课题“陇东地区主要农作物种植干旱风险区划研究” |
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| 中文摘要: |
| 选取甘肃陇东地区10个代表站19612008年48年逐月降水量资料,根据计算出的Z指数按旱涝等级划分标准,把Z指数划分成7个等级,确认陇东干旱强度,研究发现在过去48 a中,陇东年Z指数有显著的下降趋势,即陇东地区近48 a来总的趋势是向干旱发展的,20世纪90年代干旱强度明显增强。春秋干旱严重,总趋势为增多,夏冬干旱较轻,总趋势为减少。分片干旱特征显示48 a中的Z指数变化有显著的下降趋势,年干旱具有连续性,综合分析春、夏、秋冬四季最严重的干旱都发生在90年代,1997年春夏秋冬四旱相连,对农业的危害最重。 |
| 英文摘要: |
| Selecting 10 weather stations’precipitation data(1961~2008) in East Gansu Province, we calculate Z index and divide it into seven levels of drought intensity. The results show that the annual Z index has a significant de-creasing trend in the past 48 years, which means this area becomes increasingly dry, especially in 1990s. Drought be-comes severe in spring and autumn, while it gets less in summer and winter. The regional drought characteristics show
that Z index has been decreasing obviously in the past 48 years, with the annual drought presenting a continuous trend. We conclude that the most damaging drought in each season ( spring, summer, autumn, and winter) all happened in 1990s. In 1997, the drought lasted all through the four seasons, which did the worst harm to agriculture. |
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