中国农业气象2026，Vol.47Issue(6)：854-866,13.DOI:10.3969/j.issn.1000-6362.2026.06.004
宁夏复合高温干旱事件时序特征及其对不同土地类型土壤墒情的影响
Temporal Characteristics of Compound Hot and Dry Events and Their Impact on Soil Moisture Across Different Land Use Types in Ningxia
摘要
Abstract
Based on daily temperature and precipitation data from 1981 to 2020,a standardized compound dry-hot index(SCDHI)was constructed.Pearson correlation,Spearman rank correlation and quantile regression methods were used in combination with soil moisture data and land cover types to assess temporal variability in SCDHI and its impact on soil moisture.The results showed that:(1)from 1981 to 2020,compound hot-drought events in Ningxia exhibited a phased and fluctuating upward trend,mainly concentrated in July and August,with an overall increase in frequency.(2)SCDHI and soil moisture exhibited a significant overall positive correlation.Among different land cover types,grassland and farmland showed the strongest correlations(r=0.58),followed by forest(r=0.56)and bare land(r=0.51),indicating stronger ecological buffering capacity in forested areas.(3)Quantile regression results revealed that grassland and bare land were most sensitive to SCDHI in the medium to high quantile range(30%-70%),farmland showed a certain degree of buffering effect due to human intervention,while forest showed no significant response.This method effectively reveals asymmetric relationships that cannot be detected by conventional mean-based analyses.In summary,compound hot-dry events have increased in frequency during the growing season in Ningxia,and their impact on soil moisture shows significant variability across land use types and quantile levels.The findings provide scientific support for regional drought monitoring and land management strategies.关键词
复合高温干旱事件/土壤墒情/Copula函数/分位数回归Key words
Compound hot and dry events/Soil moisture/Copula function/Quantile regression引用本文复制引用
李文迪,SEKA M. Ayalkibet,KALISA Wilson,张佳华..宁夏复合高温干旱事件时序特征及其对不同土地类型土壤墒情的影响[J].中国农业气象,2026,47(6):854-866,13.基金项目
山东省中央引导地方科技发展资金项目(YDZX2023019) （YDZX2023019）
山东省自然科学基金项目(ZR2023QD073 （）
ZR2024LQX005 （）
ZR2024QD156) （）
