Spatio-temporal trends and driving mechanisms of vegetation NPP in Shaanxi province from 2000 to 2023

doi:10.13474/j.cnki.11-2246.2025.1114

Abstract

Abstract: Quantitatively analyzing the spatio-temporal variations and driving mechanisms of vegetation net primary productivity (NPP) in Shaanxi province based on long-term remote sensing data is crucial for assessing regional ecosystem stability and elucidating carbon cycle dynamics.Utilizing MODIS NPP products and multi-source data from 2000 to 2023,this study integrated Sen's trend analysis,the Hurst index,partial correlation analysis,residual analysis,and the geodetector method to analyze the spatio-temporal dynamics and driving factors of vegetation NPP in Shaanxi province at the pixel scale.NPP showed a significant increasing trend from 2000 to 2023,with a growth rate of 8.19 gC·m^-2·a^-1.The spatial distribution of NPP showed higher values in the south and lower values in the north; 97.63% of the area exhibited increasing trends.The Hurst index indicated that the improving trend would persist in 99.15% of the region.The spatial heterogeneity of precipitation and temperature impacts was significant (positive synergy in Northern Shaanxi,temperature dominance in Guanzhong/Southern Shaanxi). Human activities promoted vegetation restoration in 76.26%of the area.Evapotranspiration (ET),precipitation,and landform type are the dominant driving factors.Among their interactions,ET∩precipitation and ET ∩ landform exhibite the strongest explanatory power.The strong interaction effects of land use/population density ∩ ET (q>83%) and∩precipitation (q>74%) indicate that changes in vegetation NPP result from the deep coupling of natural and socioeconomic factors.

Key words: Hurst index, partial correlation analysis, Sen trend analysis, residual analysis, geodetector

CLC Number:

P237

CHANG Dee, WEI Haixia, CHEN Liyan. Spatio-temporal trends and driving mechanisms of vegetation NPP in Shaanxi province from 2000 to 2023[J]. Bulletin of Surveying and Mapping, 2025, 0(11): 91-98.

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