Resources Science ›› 2017, Vol. 39 ›› Issue (11): 2130-2140.doi: 10.18402/resci.2017.11.11

• Orginal Article • Previous Articles     Next Articles

Spatio-temporal analysis of drought vulnerability on the Loess Plateau of China at town level

SHI Yuzhong1, LI Wenlong1, 2, LU Daming1, WANG Ziqiao1, YANG Xinjun1   

  1. 1. College of Urban and Environmental Sciences,Northwest University,Xi’an 710127,China;
    2. College of Resources and Environment Economy,Inner Mongolia Finance and Economics College,Hohhot 010070,China
  • Received:2017-04-10 Revised:2017-08-05 Online:2017-11-20 Published:2017-11-20

Abstract: Drought vulnerability assessment plays an important role in studies on mitigation and adaptation to combat drought. The assessment on the drought vulnerability of the rural areas at town level provides a new viewpoint of human-environment system sustainability in arid and semi-arid regions of northwestern China. In view of drought vulnerability assessment,we constructed an indicator system in three dimensions including exposure,sensitivity,and adaptive capacity,by adopting the comprehensive evaluation framework of drought vulnerability. We selected Yuzhong County,one of typical counties on the Loess Plateau,as the study area,and applied entropy evaluation method,drought vulnerability index,and the local spatial autocorrelation index to calculate indicator weights,the drought vulnerability index,and the spatial agglomeration respectively,based on statistical,meteorological and remote sensing data from 2002 to 2015 as model input. The main results include:(1)The drought vulnerability index varies greatly,with a clear rise or fall trend periodically from 2002 to 2015; (2)The number of towns with different drought vulnerability degrees ranging from high to low is middle,high,and low,and the number of towns with high drought vulnerability degree significantly increases;(3)The influential factors on drought vulnerability from high to low are annual precipitation,slope,annual mean air temperatures,drought area,net income of farmers,population density,and the proportion of agricultural population to total population,among which the annual precipitation is the main driver influencing the drought vulnerability; (4)In terms of spatial pattern of drought vulnerability,the hot spots are distributed in the south and north of Yuzhong County,while the cold spots are found in the central part of the county,indicating that there exists an obvious geographical agglomeration,and several towns in hot spot areas tend to be stable.

Key words: drought vulnerability index, Getis-Ord G*, influencing factors, Loess Plateau, spatial and temporal evolution