Response relationship between agricultural drought and meteorological drought in Dabie Mountains based on MOD16 and surface precipitation data
Using meteorological observations of Dabie Mountain area and MODIS16A2 data from 2000 to 2020,the precipitation distance level percentage ( PA) and crop water stress index ( CWSI) were calculated to study the spatial and temporal distribution characteristics of agricultural drought and meteorological drought,and the response relationship between the two was explored using lag correlation analysis.The results showed that:(1) there was a significant spatial and temporal unevenness in precipitation distribution in the Dabie Mountain are-a,with less in the northwest and more in the southeast,and the difference in precipitation between drought and flood years was large (up to 875 mm).(2) The frequency of meteorological drought events in the southeastern part of the Dabie Mountain area was high ( up to 66.67%) but the drought intensity was less severe,and in the northern part of the area,the frequency of drought events was low ( up to 38.1%),but it was susceptible to severe droughts.(3) Agricultural drought in the Dabie Mountain area had the characteristics of being easy to occur in the fall,win-ter,and spring,in the north,and at lower elevations.(4) In general,the response of agricultural drought to mete-orological drought in the southern Dabie Mountain area was the largest in the next month and the third month.Agri-cultural drought is more prone to occur,lasts longer,and has a greater impact than meteorological drought.
agricultural droughtmeteorological droughtcharacteristics of spatial and temporal distributiontheory of runlag correlationDabie Mountain area
万方数据
维普
