Peak vegetation growth dominated interannual variations in ecosystem photosynthetic capacity in a coastal brackish wetland

This dataset includes eddy covariance and meteorological data collected from a coastal brackish wetland during 2011–2022, together with 19 additional wetland sites retrieved from the FLUXNET2015 database. The dataset contains continuous measurements of incoming radiation (Rg), air temperature (Ta), evaporative fraction (EF), vapor pressure deficit (VPD), precipitation (PPT), the maximum normalized difference vegetation index (NDVImax), gross primary productivity (GPP), ecosystem respiration (Reco), and net ecosystem exchange (NEE). The eddy covariance raw data have undergone standardized processing procedures, including raw data correction, quality control, interpolation, and flux partitioning to ensure usability for further analysis. The dataset enables investigation of the interannual variations in photosynthetic capacity (GPPsat) and its driving factors. This study showed that GPPsat exhibits pronounced interannual fluctuations during the study period, with peak vegetation growth playing a dominant role compared with climatic variables. A global analysis of 19 additional wetland sites further confirmed a significant relationship between peak vegetation growth and GPPsat. This long-term dataset provides a valuable basis for improving our understanding of carbon dynamics in coastal brackish wetlands.