干旱区研究2026，Vol.43Issue(1)：156-166,11.DOI:10.13866/j.azr.2026.01.14
陕西省多时间尺度干旱对植被动态变化的影响
Effects of drought on vegetation dynamics at multiple time scales in Shaanxi Province
摘要
Abstract
Analyzing and quantifying the spatiotemporal response of vegetation to drought across different time scales are crucial for ecological restoration and disaster prevention.In this study,the standardized precipitation evaporation index(SPEI)was calculated using meteorological observations from 85 stations in Shaanxi Province from 2000 to 2020.By combining SPEI with the normalized difference vegetation index(NDVI),trend analysis,partial correlation analysis,and ridge regression analysiswere employed to investigate the spatiotemporal varia-tions of SPEI and NDVI,examine the correlation between them,and quantify the relative contribution of season-al SPEI to annual NDVI changes.From 2000 to 2020,the drought frequency in Shaanxi Province was highest in spring(42.6%),followed by summer(29.7%),autumn(21.6%),and winter(21.9%).Northern Shaanxi had the highest drought level(29.6%),followed by southern Shaanxi(28.7%)and central Shaanxi(27.9%).Approximate-ly 89.7%of Shaanxi Province exhibited an increasing humidity trend,which was most pronounced in spring,fol-lowed by summer,autumn,and winter.The average NDVIs for southern Shaanxi,central Shaanxi,and northern Shaanxi were 0.89,0.77 and 0.57,respectively,and approximately 88.0%of Shaanxi Province displayed signifi-cant vegetation improvements.Approximately 53.2%of Shaanxi Province exhibited no significant positive corre-lation between SPEI and NDVI,whereas a significant positive correlationwas only observed in 6.9%of the prov-ince,mainly concentrated in northern Shaanxi.Non-significant negative correlations were primarily recorded in central Shaanxi.The areas where the relative impactof SPEI in spring,summer,autumn,and winter on annual NDVI changes exceeded 50%accounted for 31.1%,23.7%,0.5%,and 15.3%of the province,respectively.关键词
SPEI/NDVI/相关性分析/相对影响系数Key words
Standardized Precipitation Evaporation Index/Normalized Difference Vegetation Index/correlation analysis/relative impact factor引用本文复制引用
宁泽楷,宋赪,张亚军,李奇,李佩..陕西省多时间尺度干旱对植被动态变化的影响[J].干旱区研究,2026,43(1):156-166,11.基金项目
陕西省自然科学基础研究一般项目(2025JC-YBMS-295) （2025JC-YBMS-295）
陕西省自然科学基础研究计划项目(2021JLM-55) （2021JLM-55）
