| 王连喜,胡海玲,李琪,孔坚文.基于水分亏缺指数的陕西冬小麦干旱特征分析[J].干旱地区农业研究,2015,33(5):237~244 |
| 基于水分亏缺指数的陕西冬小麦干旱特征分析 |
| Analysis on drought characteristics of winter wheat in Shaanxi Province based on crop water deficit index |
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| DOI：10.7606/j.issn.1000-7601.2015.05.41 |
| 中文关键词: 水分亏缺指数；干旱频率；冬小麦；时空特征 陕西省 |
| 英文关键词:crop water deficit index drought frequency winter wheat Shaanxi province spatiotemporal characteristic |
| 基金项目:国家科技支撑计划“全球变化环境下作物产量的影响与适应监测评估技术”(2012BAH29B03) |
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| 摘要点击次数: 2085 |
| 全文下载次数: 1917 |
| 中文摘要: |
| 以陕西1961—2010近50 a 22个站点的逐日气象数据为基础资料，计算其冬小麦生育期各旬需水量（ETi）以及作物缺水指数（CWDI），并根据农业干旱等级计算出研究区干旱频率，分析陕西冬小麦各生育期内干旱指数时空分布特征。结果表明：陕西冬小麦各生育期干旱频率为拔节抽穗期>灌浆成熟期>返青期>冬前生长期>越冬期；冬小麦重旱以上频率的空间分布由北向南逐渐减少；冬小麦干旱指数的年代际变化呈上升趋势，20世纪70年代和90年代干旱指数较高，1968年为突变年份。 |
| 英文摘要: |
| Based on the observation data collected from 22 weather stations during 1961—2010, the winter wheat water requirement (ETi) was measured, the crop water deficit index (CWDI) of different classes of drought was determined, the frequencies of different classes of drought in Shaanxi were calculated, and the temporal and spatial distribution characteristics of winter wheat water deficit at different growth stages in Shaanxi area were studied. The results indicated that drought occurred frequently during the growth period of winter wheat in Shaanxi area. The occurrence frequencies of drought during wheat growth followed the following order: jointing-booting stage>filling maturation stage>turning green stage>seeding before winter>growing in winter. The occurrence frequency of severe or worse drought at various growth stages of winter wheat showed a decreasing trend from north to south. For inter-decade change characteristics, drought index fluctuation turned an increasing trend, reaching high in 1970s and 1990s and becoming mutated in 1968. |
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