Ecology and Environmental Sciences ›› 2016, Vol. 25 ›› Issue (3): 415-421.DOI: 10.16258/j.cnki.1674-5906.2016.03.008

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  • Received:2018-10-29 Revised:2018-10-29 Online:2016-03-25 Published:2018-09-14

基于SPI的渭北黄土高原干旱时空特征