胶州湾典型河口湿地土壤无机碳分布及影响因素

选择胶州湾大沽河与洋河河口湿地作为研究区,按平行于海岸带方向的光滩和垂直于海岸带方向的河漫滩分层采集土壤样品,测定土壤无机碳（Soil inorganic carbon,SIC）含量、相关离子含量及土壤理化性质,应用Duncan方法及Pearson方法对SIC含量进行组间数据差异显著性分析和相关性分析。结果表明：光滩SIC含量总体呈现距入海口越远,SIC含量越高的趋势,水体的冲刷作用是导致该现象的主要原因。随距海距离增加,河漫滩SIC含量总体呈现先降低后升高的趋势,主要受人类活动等综合因素的影响。互花米草（Spartina alterniflora）入侵使SIC含量明显降低,这是入侵物种根系的转化作用所导致的。养殖活动改变了养殖池塘自身环境因子,进而改变了SIC分布规律,表现为其总体SIC含量高于光滩。相关性分析表明,SIC含量与土壤含盐量、土壤溶解性无机碳含量及土壤pH呈显著正相关。

Distribution and Influencing Factors of Soil Inorganic Carbon in Typical Estuarine Wetland of Jiaozhou Bay

Soil inorganic carbon (SIC) is a significant component of soil carbon, which is crucial for assessing regional SIC storage, exploring terrestrial carbon circulation, and alleviating global greenhouse effect. In order to analyzed the distribution of SIC content in typical estuaries and the effects of invasion of Spartina alterniflora and human aquaculture activities, we examined the SIC content, ion content, and soil physical and chemical properties in the Dagu River and the Yanghe River estuary wetland of Jiaozhou Bay. Soil samples were collected by stratified sampling in the mudflat paralleled to the coastal zone and the river flat perpendicular to the coastal zone. Duncan method and Pearson method were used for analyzing the significance of intragroup difference and correlation of the SIC content. The results showed that the scouring action of water bodies led to the lowest content of SIC in the river estuary of mudflat. The farther away from the estuary, the higher the content was. In river flat, the SIC content decreased first and then increased with the distance from the sea, which was influenced by human activities. Invasion of Spartina alterniflora made SIC content significantly decreased, with its root transformation being the main reason for such decreases. The farming activities changed the environmental factors of aquaculture pond, and then changed the distribution of SIC. The SIC content of the pond was higher than that of mudflat. Correlation analysis showed that SIC content was significantly positively correlated with soil salt content and soil dissolved inorganic carbon, and negatively correlated with soil pH.