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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
Temporal and Spatial Patterns of Drought Based on Standard Precipitation Index (SPI) in Tibet During 1981-2013
中国农学通报 . 2015, (25): 228 -234 .  DOI: 10.11924/j.issn.1000-6850.casb15040033