丹江口水库丰水期与枯水期co2通量变化特征及影响因素

Key Points

• This research aims to analyze the dynamic changes in CO2 flux at the water-atmosphere interface under different hydrological conditions in Danjiangkou Reservoir.
• Utilized eddy covariance observation data from April 2022 to February 2024.
• Applied structural equation modeling (SEM) to quantify CO2 flux differences and influencing factors.
• Analyzed seasonal variations between wet (April-October) and dry (November-March) periods.
• The average CO2 flux was (0.12±1.93) μmol/(m²·s), indicating a weak carbon source overall.
• During the wet period, CO2 flux was (0.97±1.22) μmol/(m²·s), while in the dry period it became a carbon sink at (-1.13±2.04) μmol/(m²·s).
• Energy factors predominantly negatively influenced CO2 flux, especially during the dry period.

Abstract