运用稳定同位素技术,借助两种不同的计算模型,对原生湿地的沉积物有机质来源进行了潜在物源分析,并计算了盐沼植被对其生态系统有机质的贡献.通过多元线性混合模型和欧几里德距离模型计算得知,在假定微体藻类的δ13C值为-23‰的情况下,微体藻类、互花米草是盐沼湿地生态系统的主要贡献体.其中微体藻类的平均贡献量可达40％,是苏北盐沼湿地生态系统有机质来源的主要贡献者；互花米草植被对互花米草滩的有机质贡献率达56％,对滩外的潮间带水体的有机质贡献率可达57％,在滨海湿地生态系统中占有重要地位.两种定量计算模型比较分析发现,欧几里德距离模型会对偶然性物源的贡献计算结果偏高,高贡献率的物源有平均化的趋势.%Stable isotope techniques and different calculation models were used to analyze the potential sources of sediment organic matter in the core area of primary wetland and to calculate the contribution of salt marsh vegetation. By using multiple resources linear mixing model and the Euclidean distance model, we concluded that micro-algae and Spartina olterniflora were the main contributors in the assumption that the δ13C value of micro-algae was -23 ‰， Micro-algae was the leading contributor to the salt rnarsh wetland ecosystems in northern Jiangsu, the average contribution rate of which was 40 %. The contribution rate of Spartina alterniflora to its marsh was 56 % and to the intertidal was 57 %. By comparing the two quantitative models, it was found that the Euclidean distance model would overestimate the contribution of incidental resources and average the resources with high contribution rate.
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