山东省降水量与不同强度降水日数变化对干旱的影响
苑文华, 张玉洁, 孙茂璞, 王 瑜
Impact of Annua l Prec ip ita tion and Ra iny Days with D ifferen t Grades Var ia tion on DroughtD isa ster in Shandong Prov ince
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J4 . 2010, (1): 35 -40 .