干旱区地理2026，Vol.49Issue(6)：1203-1214,12.DOI:10.12118/j.issn.1000-6060.2025.390
SMAP升轨土壤水分产品在柴达木盆地的适用性和时空变化分析
Applicability and spatiotemporal variation analysis of SMAP ascending products to soil moisture in Qaidam Basin
摘要
Abstract
Soil moisture is a critical regulator of terrestrial water cycles,energy exchange,and carbon fluxes.However,soil moisture observations in plateau regions are constrained by challenges,such as uneven station dis-tribution and sparse measured data.However,soil moisture active passive(SMAP)satellite products provide im-portant data support for large-scale monitoring in these regions.The applicability of SMAP ascending soil mois-ture data was first evaluated using multiple accuracy-evaluation metrics,after which spatiotemporal soil moisture responses in Qaidam Basin were analyzed via Theil-Sen median+Mann-Kendall trend tests,rescaled range analy-sis,and coefficient of variation.Results show the following:(1)SMAP soil moisture products exhibit dry-overes-timation and wet-underestimation biases in the Qaidam Basin.The correlation coefficient with the measured soil moisture content is 0.6543,with an unbiased root-mean-square error of 0.0928 m3·m-3.Although this does not meet the expected target accuracy,it remains a viable reference.(2)SMAP soil moisture products exhibit differ-ent performances across varying vegetation covers,peaking under medium coverage,followed by low coverage,and declining significantly under high coverage.(3)SMAP soil moisture products effectively capture moisture surges,accurately reflecting the entire process involving precipitation infiltration,soil moisture accumulation,and extinction.(4)From 2015 to 2024,Qaidam Basin grassland soil moisture shows a space distribution in the growing season:It first decreases,after which it increases from the basin center toward its four peripheries on av-erage for many years,exhibiting a space distribution of the trend-change rate.Spatially,trend rates increase in the southeast,decrease slightly in the central region,and increase marginally in the northwest.The stability is domi-nated by medium and relatively low fluctuations.Additionally,the spatial distribution pattern shows a"wide tran-sition zone and a concentrated extreme zone".Projections indicate that Qaidam Basin soil moisture will generally maintain a persistent increasing trend.关键词
SMAP/土壤水分/适用性/时空变化/柴达木盆地Key words
SMAP/soil moisture/applicability/spatiotemporal variation/Qaidam Basin引用本文复制引用
李素雲,祝存兄,王镜,陈国茜,史飞飞..SMAP升轨土壤水分产品在柴达木盆地的适用性和时空变化分析[J].干旱区地理,2026,49(6):1203-1214,12.基金项目
青海省气象局"揭榜挂帅"科技项目(QXGS2023-05) （QXGS2023-05）
青海省防灾减灾重点实验室重点项目(QFZ-2024-Z02) （QFZ-2024-Z02）
国家自然科学基金项目(U22A20556) （U22A20556）
青海省科学技术协会"青海省科技工作者建言"项目资助 （）
