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基于SPI的潍坊市近50年的干湿特征分析
李树军 袁静 肖清华 董晨娥
Characteristic of Droughts and Humidification Based on Standard Precipitation Index in Weifang During the Past 50 Years
中国农学通报 . 2011, (26): 293 -298 .  DOI: 10.11924/j.issn.1000-6850.2011-2167