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湖滨带等水陆交错区土壤碳循环是全球碳循环的一个重要的组成部分,但相关方面的研究还相当缺乏。本研究选择位于苏州渔阳山保存较为良好的典型的太湖湖滨带作为实验地,并根据距离水体的远近,将湖滨带从近水体到高岗地分别设置3个实验区,对湖滨带湿地土壤水溶性有机碳(WSOC)、轻组有机碳(LFOC)2种活性有机碳进行研究,分析土壤活性有机碳与土壤因子的关系。结果表明:土壤水分明显影响土壤表层活性有机碳的含量,湖滨带土壤WSOC、LFOC在表层(0～10cm)沿土壤水分梯度的降低而减小,表现为近水区>中水区>远水区,且下层土壤沿水分梯度的差异变小;表层土壤活性有机碳各组分显著高于下层土壤,这与土壤有机碳和氮素变化趋势一致;WSOC、LFOC均与土壤总有机碳、土壤全氮、土壤含水率呈显著或极显著正相关;沿水分梯度土壤有机碳、全氮和土壤湿度是调控土壤活性有机碳沿水分梯度变化的主要因子。
The soil carbon cycle in the lakeshore belt and other water and land ecotone is an important component of the global carbon cycle. However, there are still quite a few researches in related fields. In this study, we selected the relatively well-preserved Taihu Lake shore belt located in Yuyang Mountain, Suzhou as an experimental site. According to the distance from the water body, three experimental zones were set up from near water body to high hillock respectively. Two active organic carbons, namely, organic carbon (SOCOC) and light organic carbon (LFOC), were studied to analyze the relationship between soil active organic carbon and soil factors. The results showed that soil moisture significantly affected the content of soil active organic carbon. The soil WSOC and LFOC in the lakeshore zone decreased along with the decrease of soil water gradient in the surface layer (0 ~ 10cm), which ranged from near water area> middle water area> far water The differences of soil organic carbon along the soil surface were lower than those of the lower soil layer, which was consistent with the trend of soil organic carbon and nitrogen. Both WSOC and LFOC were positively correlated with soil total organic carbon, soil Total nitrogen and soil water content were significantly or very significantly positively correlated. Soil organic carbon, total nitrogen and soil moisture along the water gradient were the main factors controlling the change of soil active organic carbon along the water gradient.