Drought Partition and Agricultural Drought Risk Zoning in Yunnan Province

doi:10.13522/j.cnki.ggps.2017.02.007

Abstract：The method of drought partition and agricultural drought risk zoning were investigated,and Yunnan province was selected as a pilot to apply the presented methods.Firstly,three indicators,including topographical features index ,average years of drought indices and negative anomaly percentage of 75%guarantee rate at annu-al level,were selected as the drought partition index,then the principal component analysis method was applied to describe drought natural partition of Yunnan province.While,drought partition consequent was used as the one of drought risk zoning index,synthetically considering drought risk hazard,fragility and vulnerability factors as the common constitutions of agricultural drought risk zoning index system.Moreover,multi-level fuzzy compre-hensive evaluation results were employed to synthetic agricultural drought risk zoning of Yunnan province.The results showed that the northeast of Yunnan province was the drought prone areas,which was more prone to drought than that of the southwest and belonged to the drought light-prone areas or less-prone areas.The north-east of Yunnan province was the high drought risk area,however,the northwest was the low drought risk area. The above consequences were basically consistent with the actual drought situation of Yunnan province.These showed that drought natural partition based on principal component method and drought risk zoning by the ele-ments in the practical application had certain feasibility and practicability.