Metal(loid)s in mangrove sediments could pose noticeable ecological risks, but studies on source-specific ecological risks of metal(loid)s in sediments are limited. In this study, surface sediments collected from a typical mangrove wetland in the Jiulong River Estuary were used to perform a comprehensive analysis of the source-specific ecological risk assessment of metal(loid)s. Cd, Hg, Mn, and Cu were the metal(loid)s with large coefficient of variation (CV) values and were more likely to be affected by human activities. Principal component analysis (PCA) first identified four potential sources, namely, natural, coal combustion and industrial, aquacultural, and agricultural sources, of metal(loid)s in surface sediments. The absolute principal component score-multiple linear regression (APCS-MLR) was then apportioned for its contributions to each metal(loid). The results showed that natural sources dominated the total metals, with a contribution of 62.7%, and coal combustion and industrial sources and aquaculture sources were the two major anthropogenic sources, with contributions of 19.26% and 17.50%, respectively. Three indices, the geoaccumulation index (I_geo), pollution index (PI), and potential ecological risk of individual factors (${\text{E}}_{\text{r}}^{\text{i}}$), clearly indicated that Hg and Cd showed much higher ecological risks than the other metals. Additionally, the integrated ecological risk could be more appropriately assessed by the Nemerow integrated risk index (NIRI), which showed no less than moderate ecological risks. More importantly, for the source-specific ecological risk assessment, the aquacultural source was identified to be a significant contributor to the ecological risk of Hg and Cd. In conclusion, the source-specific ecological risk rather than the sole source apportionment or ecological risk assessment could provide more information for the targeted environmental management of sediments contaminated by metal(loid)s.

红树林沉积物中金属（液）类具有显着的生态风险，但对沉积物中金属（液）源特定生态风险的研究还很有限。本研究以九龙江口典型红树林湿地表层沉积物为样本，对金属（类）体的特定源生态风险评估进行综合分析。Cd、Hg、Mn、Cu是变异系数（CV）值较大的金属（Loid），更容易受到人类活动的影响。主成分分析 (PCA) 首先确定了表层沉积物中金属（液体）的四种潜在来源，即天然、燃煤和工业、水产养殖和农业来源。然后将绝对主成分得分-多元线性回归 (APCS-MLR) 分配到其对每种金属 (loid) 的贡献。结果表明，天然来源在金属总量中占主导地位，贡献率为62.7%，燃煤和工业来源以及水产养殖来源为两大人为来源，贡献率分别为19.26%和17.50%。三个指数，地积累指数（I _geo）、污染指数（PI）和个体因素的潜在生态风险（${\text{乙}}_{\text{r}}^{\text{一世}}$)，清楚地表明 Hg 和 Cd 比其他金属表现出更高的生态风险。此外，内梅罗综合风险指数（NIRI）可以更恰当地评估综合生态风险，该指数显示不低于中等生态风险。更重要的是，对于特定源的生态风险评估，水产养殖源被确定为汞和镉生态风险的重要贡献者。总之，源特异性生态风险，而不是单一的源分配或生态风险评估，可以为金属（液体）污染沉积物的针对性环境管理提供更多信息。