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Central Asian droughts have drastically and significantly affected agriculture and water resource management in these arid and semi-arid areas.Based on tree-ring δ18O from native,dominant Schrenk spruce(Picea schrenkiana Fisch.et Mey.),we developed a 300-year(1710 to 2010)standard precipitation-evaporation index(SPEI)reconstruction from January to August for China's western Tianshan Mountains.