• 关键词：芦苇  小尺度  水文连通  野外染色示踪实验

• 基金项目：国家自然科学基金（No.41771547）

• 赵思齐
• 北京林业大学生态与自然保护学院，北京 100083

• 代立熠
• 北京林业大学生态与自然保护学院，北京 100083

• 解璐萌
• 北京林业大学生态与自然保护学院，北京 100083

• 赵世强
• 北京林业大学生态与自然保护学院，北京 100083

• 张明祥
• 北京林业大学生态与自然保护学院，北京 100083

• 摘要：海水入侵导致黄河三角洲滨海湿地盐碱化不断向陆相扩张，改变了许多物种的栖息地环境.保护区管理人员通过引黄河淡水，修建淡水恢复区来遏制这一趋势，而与此同时这也改变了潮间带植物群落和土壤理化性质的改变：大面积芦苇生长，土壤盐分降低，土壤孔隙度增加，优先流路径改变，从而导致小尺度内，垂向水文连通的改变，进而影响整个区域的水文过程.为探讨土壤物理性质对垂向水文连通的影响，选取黄河三角洲的芦苇群落为研究对象，应用野外染色示踪实验的方法，定量分析不同土壤层次的土壤物理性质，结合不同土壤层次的染色模式影像，探讨土壤对垂向水文连通的影响.研究结果表明：应用野外染色示踪实验的方法，定量分析不同土壤层次的土壤物理性质，结合不同土壤层次的染色模式影像，探讨土壤对垂向水文连通的影响.研究结果表明：①土壤深度0~40 cm时，土壤质量含水量、孔隙度会随着土壤深度的增加而降低.②各层染色面积比因土壤深度的增加而逐渐减小，不同样地的最大染色深度与土壤总质量含水量、总孔隙度呈显著负相关（R²=0.80；R²=0.99）；不同样地的总染色面积比与土壤总质量含水量、总孔隙度呈显著负相关（R²=0.99；R²=0.68），与土壤总容重呈显著正相关（R²=0.83）.③各层土壤的染色面积比、染色深度与土壤物理特征没有显著相关性，土壤的染色面积基本不受土壤物理性质的影响.但各层土壤染色面积比与土壤深度呈显著的负相关性（p＜0.01）.

• Abstract：Soil salinization of coastal wetlands in the Yellow River Delta （YRD） has been expanding landward due to on-going seawater intrusion， which has changed the habitat environment of many species. The YRD National Nature Reserve has been trying to curb this trend artificially by diverting freshwater from the Yellow River， inducing changes of intertidal plant communities and soil physicochemical properties： Extensive reed growth was accompanied by decreased soil salinity， increased soil porosity， and altered preferential flow path， which leads to the change of vertical hydrological connectivity at small scale， and thus affects the hydrological process of the whole region. To explore the effects of soil physical properties on vertical hydrological connectivity， field dyeing tracer experiment was conducted in reed wetlands of the YRD， and quantitative analysis of soil physical properties in different soil layers， combined with dyeing pattern image， was employed to explore effects of soil physical properties on vertical hydrological connectivity. Results show that：① For soils at the depth of 0~40 cm， the mass water content and porosity of soil decreased with the increased soil depth.② Dyeing area ratio of each layer gradually decreased with the increase of soil depth， and the maximum dyeing depth was significantly negatively correlated with soil total mass water content and total porosity （R²=0.80； R²=0.99）. Total dyeing area ratio significantly negatively correlates with soil mass water content and total porosity （R²=0.99； R²=0.68）， and significantly positively correlates with soil bulk density （R²=0.83）.③ There was no significant correlation between soil physical properties and soil dyeing area ratio and depth， suggesting soil dyeing area was not affected by soil physical properties. However， there was a significant negative correlation between soil dyeing area ratio and soil depth （p<0.01）.

• Key words：reed  small-scale  hydrological connectivity  field staining tracer experiment

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