Effects of freshwater restoration on dynamics of water and salt information in salt marsh soils of the Yellow River Estuary,China
Information on spatial distribution of water and salt in wetland soils helps to understand adaptation mechanisms of plant communities in saline habitats,and to elucidate the physical,chemical and biological processes of soil ecosystems.Surface soil samples were collected in the present work from salt marshes and freshwater restoration wetlands in the Yellow River Estuary in plant growing season typical soil profiles were collected in spring,summer and autumn.Soil water and salt characteristics were analyzed to elucidate vertical distributions and seasonal variations in soil water and salt information in both types of wetlands and their correlationship.Results showed that salt marsh soils had higher electrical conductivity (EC) than freshwater restoration wetlands soils but decreased gradually in the growing season,while soil EC values firstly decreased then increased after water and sediment regulation in freshwater restoration wetland.Soil water contents (WC ) of both wetland types increased slowly in the growing period, soil WC increased significantly after water and sediment regulation in freshwater restoration wetlands.WC and EC values of salt marsh soils fluctuated with increasing soil depth.WC in the freshwater restoration wetlands was:upper layer>bottom layer>middle layer before and after water and sediment regulation.EC in the freshwater restoration wetlands showed the opposite trend.There was a significant positive correlation between EC and SO2-4 /Cl-(P<0.01 )in surface soil of salt marshes and freshwater restoration wetlands,while soil EC only exhibited positive correlation with Cl-(P<0.05)in freshwater restoration wetlands.The dynamic changes in soil water and salt information in wetlands of the Yellow River Estuary are therefore affected by heterogeneity of resources under different flooding conditions.
the Yellow River Estuarywetland soilswater and saltspatial distributionseasonal dynamics
国家科技期刊平台
NSTL
万方数据
维普
