Spatial Pattern Of Soil Water And Salt In Sugan Lake Wetland And Its Influencing Factors

The wetland ecosystem was the spatial area where the material circulation and energy flow between wetland biological and non-biological elements interact.The soil was an important participant and carrier of the wetland ecological process.The spatial heterogeneity of soil water and salt was the combined effect of multiple factors on multiple scales.The results reflected the response of soil water and salt transport to environmental factors and were of great significance for the in-depth understanding of the trend of soil water and salt transported on wetland ecological succession in the ecological and hydrological function zones of inland salt marsh wetlands under the background of global climate change.In this study,Sugan Lake wetland was selected as the study area,and the Sugan Lake wetland was divided into five ecological function areas using GIS spatial overlay technology;the method of spatial autocorrelation and semivariance function was used to study the soil water in different functional areas of Sugan Lake wetland.The spatial distribution pattern of salt;the application of geographic detection models to analyze the relationship between environmental factors such as wetland types,vegetation,groundwater depth,vegetation coverage,and soil water and salt in each functional zone;aims to clarify the ecological and hydrological functions of the Sugan Lake wetlands The spatial distribution characteristics and influencing factors of the soil water and salt in the subregions will help to understand the role of soil water and salt in the succession process of the ecological environment of the wetland,and provide a theoretical basis for evaluating the stability and maintenance mechanism of the ecological environment of the Sugan Lake wetland.Research indicates:(1)The soil moisture content of Sugan Lake wetland is low,with moderate variability and spatial positive correlation characteristics,and its random variation degree was weaker than the total variation degree of the system,and its spatial autocorrelation is strong;With the increase of soil depth,the water content increases,the random variability decreases,the total variability of the system increases,the spatial autocorrelation scale increased and the spatial distribution becomes stable;There were differences in soil moisture content and its spatial correlation among different functional divisions,among which there was a negative spatial correlation(Moran's I< 0)in the lake water area,which belongs to "high-low" and "low-high" types and has the characteristics of spatial discrete distribution;There was a spatial positive correlation(Moran's I>0)between the soil moisture content in spring water area,river flood area,platform and mountain torrent area,which belongs to the type of "high-high" and "low-low",and has the characteristics of spatial agglomeration and distribution.(2)The soil salt content of Sugan Lake wetland is strong,which was characterized by surface aggregation.The soil salt content is high of surface 0-10 cm soil layer,The spatial heterogeneity is strong,which affected by structural factors and it is patchy mosaic distribution,with multiple high and low value centers.With the increase of soil depth,the influence of structural factors weakens,the soil salt content is low,the total variability of the system weakens,and the spatial accumulation becomes stable.There are differences in soil salt content and spatial heterogeneity among different functional divisions(3)The spatial pattern of soil water and salt content in 0-50 cm of Sugan Lake Wetland is mainly affected by vegetation coverage and groundwater table depth,and the explanatory power of the two detection factors is significant,while the explanatory power of other factors is not significant.Compared with the explanatory power of a single factor,the interaction of any two factors on the spatial distribution of soil water and salt content shows a synergistic effect,showing the characteristics of two-factor enhancement or non-linear enhancement,and there is no mutual independence and weakening relationship.