条子泥围垦区水盐特征与植被分布的关系

为了探究江苏东台条子泥围垦区的水盐分布规律，揭示圆环状植被分布与土壤水盐条件的关系，于2019年9月对围垦区内用作湿地恢复的区域进行测量和采样。在植被环附近测量了二维、三维大地电阻率，采集降水、地表水、土壤、地下水等样品，测试样品的水盐指标和D、18O同位素组成。结果表明:植被圆环下方3 m深度内均存在对应的高电阻率/低盐度区域，且随着植被类型由中心向外环变化，对应的土壤水盐度也逐渐增大；土壤水盐度是不同植被呈现圆环状分布的重要影响因素，其变化受降水入渗和土壤蒸发引起的盐分集结共同作用；土壤盐度直接影响了不同植被种群的分布格局，而植被对入渗和蒸发过程的影响也反作用于土壤盐度分布。

Relationship between water salinity and vegetation distribution in the Tiaozini reclamation area

To investigate the water and salt distribution,and explore the relationship between vegetation circles and soil water salinity conditions in the Tiaozini reclamation area of Dongtai,Jiangsu,a measurement and sampling campaign was conducted in a reclaimed zone used for wetland restoration in September 2019. Electrical resistivity tomography (2-D and 3-D) was conducted near the plant circles. Precipitation,surface water,soil profiles,and shallow groundwater samples were collected and analyzed for water and salt parameters as well as for D and ¹⁸O isotopic compositions. The results show that low resistivities and high salinity zones exist underneath the plant circles within 3 m of depth,and soil water salinity increases with the plant type,changing from the center of the circle to the outer area. Soil water salinity is an essential factor for the circular distribution of different plant types. Spatial variation of surface soil water salinity results from both precipitation infiltration and salt accumulation caused by evaporation. Soil salinity affects the distribution pattern of different plant types,while plants can also influence the salinity distribution by affecting the infiltration and evaporation processes.