Temporal and spatial variation of summer soil moisture and its driving factors in Yellow River basin during the last 20 years

doi:10.7523/j.ucas.2023.041

Abstract

Abstract: Based on the moderate resolution imaging spectroradiometer products and global land data assimilation system meteorological data from 2001 to 2020, soil moisture in summer in the Yellow River basin was retrieved based on the vegetation index/land surface temperature trapezoid feature spatial model. The spatial-temporal pattern and driving factors of soil moisture in the Yellow River basin were analyzed using the Sen slope method, Mann-Kendall method, and geographical detector. The results showed that soil moisture in the Yellow River basin had apparent spatial heterogeneity. The source and lower reaches of the Yellow River are humid, while the middle reaches are relatively dry. From 2001 to 2020, soil moisture in the Yellow River basin showed an insignificant increase and an insignificant decrease in space, accounting for 39.54% and 58.01% of the regional area, respectively. The growth rate of soil moisture in the upper reaches was the fastest. Precipitation is the dominant factor of temporal variation of soil moisture in the Yellow River basin. Temperature and elevation are the main factors affecting the spatial variation of soil moisture in the upper reaches, and normalized difference vegetation index and precipitation are the main driving factors influencing soil moisture change in the middle reaches of the Yellow River.

Key words: Yellow River basin, soil moisture, spatial-temporal pattern, trapezoid feature spatial model, geographical detector

CLC Number:

TP79

ZHANG Ya'nan, SONG Xiaoning, LENG Pei, GAO Liang, YIN Dewei. Temporal and spatial variation of summer soil moisture and its driving factors in Yellow River basin during the last 20 years[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(4): 477-489.

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