Spatio-temporal differentiation characteristics and influencing factors of NPP in Fenhe River Basin from 2001 to 2021
Vegetation NPP is an important parameter reflecting vegetation ecological quality and carbon cycle in the regional ecosystem.In order to study the spatiotemporal changes of NPP and its dominant factors in the Fenhe River Basin,this paper combined MODIS NPP,climate,terrain and other data,using Theil-Sen trend analysis,correlation Using sexual analysis,geographical detectors and other methods,the spatial and temporal differentiation characteristics and driving factors of NPP in the Fenhe River Basin and mining areas within the basin were analyzed from 2001 to 2021.The results show that NPP in the Fenhe River Basin has obvious spatial heterogeneity.The average NPP in the mountainous areas on the east and west sides of the basin is higher,and the average NPP in the middle of the basin is lower.The NPP in the Fenhe River Basin showed a fluctuating upward trend over the past 21 years,with an inter-annual increase rate is 7.44 gC/(m2·a).The interannual increase rate of NPP in the mining areas within the basin is slightly higher than that of the entire basin.The average NPP values in different mining areas are different but all increase significantly.The area with a decreasing trend in NPP in the entire watershed only accounts for 0.91％,mainly distributed around urban areas and mining areas,and the global Moran index of NPP changes is 0.792.There is obvious spatial autocorrelation in NPP changes,and areas with drastic changes Mainly distributed in mining areas.With the increase of elevation and slope,the average NPP value of the watershed shows an increasing trend.The correlation between annual rainfall and NPP is higher than that of annual average temperature.95.16％of the areas are positively correlated with annual rainfall,and 77.86％of the areas are positively correlated with annual rainfall.The average annual temperature is positively correlated.The detection results of influencing factors show that land use change is the dominant factor affecting NPP changes in the Fenhe River Basin,and the impact after the interaction of two factors is significantly higher than that of a single factor,among which the interaction between land use and elevation has the highest influence.
Fenhe River BasinNPPSpatio-temporal characteristicsMODIS datageographical detection
NETL
NSTL
万方数据
