摘要为了研究青藏地区干旱时空分布特征，本文使用 1980-2010 年的逐月气象站 点数据计算综合气象干旱指数，对青藏地区不同时间尺度的干旱发生频率、发生 范围、趋势率以及干旱强度进行分析，并讨论了综合气象干旱指数与植被状态指 数之间的相关性与滞后性。70830

结果表明：新疆南部和青海中部是全年干旱的高发区，青藏地区在春季和冬 季的干旱从频率、范围和强度上都要高于夏季和秋季；青藏地区的干旱覆盖率在 近年保持上升趋势，季节上春、冬季干旱覆盖率保持上升，而夏、秋略微下降； 青藏地区整体的干旱变化情况逐年加重，季节上春、夏、秋季在青海东部和四川 北部旱情加重，而秋季青海北部地区干旱逐渐好转，冬季西藏西南大部分区域干 旱加重，而青海北部和四川西部则出现干旱好转；青藏地区近年来的干旱强度逐 渐加强，季节上春季干旱强度增强而夏季减弱，秋、冬季则变化不大；4、5、6 月份气象条件对植被的状态的影响存在 2~3 月的滞后，9、10 月份的气象条件存 在 1~2 月的滞后。最后，对本文在研究工作中还存在的一些不足之处进行了总结。

该论文有图 29 幅，表 3 个，参考文献 29 篇。

毕业论文关键词： 综合气象干旱指数 植被状态指数 干旱监测 干旱分析 青藏地区

Analysis of Spatiotemporal Characteristics of Drought in Qinghai-Tibet Region Based on Meteorological Drought Composite Index

Abstract In order to study spatiotemporal characteristics of drought in Qinghai-Tibet region, this paper analyzed the frequency, range, trend rate and strength of drought in multi-time scale and discussed the dependency and backwardness between Vegetation Condition Index (VCI) and meteorological drought Composite Index (CI) based on the monthly meteorological stations data during 1980-2010.

The results showed that drought occurred frequently in  Xinjiang South and Qinghai Central all year around. The frequency, range, and strength of drought in spring and winter were higher than in summer and autumn. Drought range kept expanding in recent years especially  in spring and winter while the range slightly declined in summer and autumn. Drought of Qinghai East and Sichuan North was aggravated in spring, summer and autumn while Qinghai North was getting better in autumn. Drought of Xizang Southwest was aggravated while Qinghai North and Sichuan West was getting better. Strength kept reinforcing in recent years especially in spring but decreasing in summer. Effect of meteorological conditions on the condition of vegetation in April, May and June exhibited hysteresis for 2 or 3 months and effect in September and October exhibited hysteresis for 1 or 2 months. Finally, this paper summarized some deficiencies during the research.

Key words：CI index VCI index drought  monitoring drought analysis Qinghai-Tibet region

目 录

摘要 Ⅰ

Abstract.. Ⅱ

目录 Ⅲ

图清单.. Ⅳ

表清单.. Ⅳ

变量注释表Ⅴ

1 绪论 1

1.1 干旱的概念 1

1.2 干旱的研究方法 1

1.3 国内外研究现状 2

1.4 研究意义 4

2 资料与方法 5

2.1 研究区域 5

2.2 综合气象干旱指数（CI） 6

2.3 植被状态指数（VCI）