Temporal and Spatial Distribution Characteristics of Drought in Heilongjiang Province Based on SPEI Drought Index
In order to analyze the spatial and temporal distribution characteristics of drought in Heilongjiang Prov-ince,the Penman-Monteith formula was used to calculate the standardized precipitation evapotranspiration index(SPEI)at different time scales based on the meteorological data of 27 stations from 1961 to 2020 in Heilongjiang Province.The distribution characteristics of drought in Heilongjiang Province were analyzed in terms of both time and spatial scales.The results show that the drought trend in Heilongjiang Province has been gradually weakening in the past 60 years,and slowly showing a wetting trend;There is a non-significant wetting trend in spring,summer and autumn(P>0.05),and a significant wetting trend in winter(P<0.05);In spatially,the north,northwest and northeast are drought-prone are-as,and the degree of drought is mostly mild drought and moderate drought.The overall drought trend in Heilongjiang Province is weakening,and the spatial and temporal distribution of drought has more obvious seasonality and regional characteristics.
SPEI indexdroughtspatial and temporal distribution characteristicsHeilongjiang Province
万方数据
维普
