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中国农学通报

中国农学通报 ›› 2015, Vol. 31 ›› Issue (25): 228-234.doi: 10.11924/j.issn.1000-6850.casb15040033

所属专题： 农业气象

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

基于标准化降水指数的1981—2013 年西藏干旱时空特征分析

袁雷,刘依兰,马鹏飞   

  1. 西藏自治区气候中心,西藏自治区气候中心,西藏自治区气候中心
  • 收稿日期:2015-04-04 修回日期:2015-06-18 接受日期:2015-06-25 出版日期:2015-09-23 发布日期:2015-09-23
  • 通讯作者: 袁雷
  • 基金资助:
    西藏自治区气象局科技创新团队基金项目“科技创新团队”(XZQX201302)；西藏自治区科技厅自然基金“西藏日喀则地区农作物气象灾害风险评估与区划”。

Temporal and Spatial Patterns of Drought Based on Standard Precipitation Index (SPI) in Tibet During 1981-2013

  • Received:2015-04-04 Revised:2015-06-18 Accepted:2015-06-25 Online:2015-09-23 Published:2015-09-23

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摘要： 为了研究西藏干旱时空分布特征，利用西藏38 个气象站点1980—2013 年的月降水资料，采用标准化降水指数(SPI)作为干旱指标，分析了西藏旱季和雨季的干旱及重旱频率分布特点。结果表明：东南部旱季干旱频率较高，西部雨季干旱频率较高；而旱季和雨季的重旱频率高的地区都在中、东部；20世纪90 年代旱季干旱和重旱发生频率最高，21 世纪初雨季干旱和重旱频率最高。对西藏不同区域干旱强度演变情况分析表明，各区域1981—2013 年旱季和雨季干旱强度变化都不一致，总体来说，沿江一线和东部地区变化相对稳定，南部边缘变化相对较剧烈。

关键词: 烤烟, 烤烟, 营养调节剂, 纳米硅, 重金属含量, 钾含量

Abstract: The paper aims to study the drought changes in Tibet. The evolution characteristics of the frequency of drought and severe drought in dry season and rainy season in the Tibet Region were analyzed based on the standardized precipitation index (SPI) as a drought index with the data of monthly precipitation of 38 ground meteorological stations during the period from 1981 to 2013. The results showed that: the drought frequency of the southeastern area was high in the dry season, drought frequency of the western area was high in the rainy season. The severe drought of the central and eastern area had high frequency in both the rainy season and dry season. The frequency of drought and severe drought in the dry season was the highest in the 1990s, and that in the rainy season was the highest at the beginning of the 21st century. The evolution of drought intensity in Tibet showed that the southern edge of Tibet had the most dramatic changes.