Geochemical conditions of natural wetland and paddy fields in the Poyang Lake area, China

Abstract During the last several decades, wetlands are losing their ecological functions due to increasing anthropogenic loads. One of these is ability bind elements forming geochemical barriers. The research aimed study conditions natural and flooded paddy fields (artificial wetlands) in Ganjiang River basin trace approach was based on a comprehensive analysis water aqueous extracts from bottom sediments soils, including chemical mineral composition. samples were collected November 2019, during dry season at end harvesting. Chemical performed using standard methods for substances: titrimetry, photometry, ionic chromatography, high-temperature oxidation, ICP-MS, ICP-AES. composition soils determined by XRD. It found that main physicochemical characteristics (TDS, pH, component concentrations) wetland correspond surface area, whereas irrigation similar shallow groundwater. content higher than water. Generally, element corresponds background area. Analysis indicates barriers accumulate wide range elements. In wetland, barrier likely associated with decrease oxygen advective transport rate sediments, fields, precipitation clay minerals soil profile forms related filtration properties advection–diffusion transport. Graphic abstract