Seasonal and interannual dynamics of water vapor flux at a fen in the Zoige peatlands on the Qinghai‐Tibetan Plateau: four‐year measurements

•The Riganqiao peatland was a net water source with emission (kg m−2 yr−1) of average 429.3 ± 51.5 from 2013 to 2017.•Impacts of interannual relative humidity (RH) and net radiation (Rn) on water vapor flux were different in each year.•Net CO2 ecosystem exchange (NEE) was significantly negative related to water vapor flux, whatever in seasonal or interannual scale.