Temporal and Spatial Changes and the Driving Factors of Vegetation NPP in the Yiluo River Basin
The Yiluo River Basin,a crucial sub-basin of the Yellow River Basin,holds significant importance for the study of temporal and spatial variations in the net primary productivity(NPP)of vegetation,pivotal for maintaining the sustainable ecological development of the region.This research aims to elucidate the spatio—temporal evolutionary trends and driving mechanisms of vegetation NPP in the Yiluo River Basin.Utilizing the refined CASA model and integrating multi-source data,including meteorological and land use information,we conducted an in-depth analysis of the spatio-temporal dynamics and driving factors influencing vegetation NPP from 2000 to 2020.Methodologies employed include trend and correlation analyses.Key findings are as follows:(1)Between 2000 and 2020,the annual mean NPP in the Yiluo River Basin fluctuated from 357.64 to 669.74 gC/(m2·a).The higher NPP values predominantly concentrated in the basin's upper reaches,characterized by greater elevations and denser vegetation cover,exhibiting a general west-to—east declining trend.(2)The study period witnessed an overall ascending trajectory in NPP across the basin,with the area experiencing NPP augmentation constituting 88.96％of the total studied expanse.(3)A positive correlation between NPP and average annual temperature was observed in 69.73％of the area,while a similar positive relationship with annual precipitation was noted in 95.22％of the region.(4)Alterations in land use types have been identified as significant contributors to NPP variability.From 2000 to 2020,the Yiluo River Basin experienced a net increase of 2.89 TgC in NPP,primarily attributed to the transformation of grasslands and other land types into forested and cultivated lands.This comprehensive analysis underscores the dynamic nature of vegetation NPP in the Yiluo River Basin and its intricate relationship with climatic factors and land use changes,thereby providing valuable insights for regional vegetation restoration and ecological conservation,and provide reference basis for ecosystem management departments to formulate scientific and reasonable land use decisions.
CASA modelnet primary productivitytemporal and spatial changesdriving factorsthe Yiluo River Basin
NETL
NSTL
万方数据
