Drivers for Carbon Variation of River in Three Gorges Reservoir Area
Understanding the impact of land use and landscape patterns on river carbon cycling is crucial for impro-ving the watershed environment.This study utilized the landscape index method,redundancy analysis(RDA),and Pearson correlation analysis to analyze the effects of landscape factors on river carbon cycling in the Three Gorges Reservoir area.The findings reveal that:1)Within a buffer zone scale of 1 500 m,the land use and landscape pat-terns have a substantial impact on the concentration of dissolved carbon in water and the fluxes of CO2 and CH4 at the water-air interface.2)The dissolved carbon within the 1 500 m buffer zone is influenced by several key varia-bles,including built-up land,and forest land.For CO2 and CH4 fluxes at the water-air interface,influential varia-bles include built-up land,forest land,grassland,arable land,bare land,Shannon's diversity index(SHDI),and patch richness density(PRD).
land uselandscape indexgreenhouse gasesdissolved inorganic carbon(DIC)dissolved organic carbon(DOC)buffer zones
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