Organic amendments (OA) have been applied in many mercury (Hg)-polluted paddy soils to meet increasing food demands with scarce land resources. However, little is known on the effects of different OAs on Hg dissolution and the composition of dissolved organic matter (DOM) in soil pore waters, both of which may be associated with Hg mobility. Consequently, DOM composition and Hg release levels were investigated in soil pore waters after applying food waste compost (FC), fulvic acids (FA) and humic acids (HA) to Hg-polluted paddy soils. FA and HA treatments promoted increased abundances of humic- and fulvic-like substances in pore water DOM while FC amendment increased soluble microbial by-products. FA amendment and high levels of both HA and FC amendments greatly promoted Hg dissolution in pore waters that could be attributed to the complexation of Hg with different DOM components. However, among all DOM components, only UVA fulvic and visible humic-like substances were positively correlated with Hg release levels and total organic carbon. These results indicate that discrepant DOM compositions are induced by different OA. Further, these differences may be associated with differential Hg dissolution in pore waters. Consequently, FA amendment and high level of FC or HA amendments should be limited to reduce potential Hg release into pore waters.

在许多汞（Hg）污染的稻田土壤中均已应用了有机改良剂（OA），以满足土地资源匮乏带来的日益增长的粮食需求。但是，关于不同的OAs对土壤汞中汞溶解和溶解有机物（DOM）组成的影响知之甚少，这两者都可能与汞迁移有关。因此，在将食物垃圾堆肥（FC），黄腐酸（FA）和腐殖酸（HA）施用到汞污染的稻田后，对土壤孔隙水中的DOM组成和汞释放水平进行了研究。FA和HA处理促进了孔隙水DOM中腐殖质和黄腐菌样物质的丰度增加，而FC改良剂增加了可溶性微生物副产物。FA修正以及高水平的HA和FC修正大大促进了Hg在孔隙水中的溶解，这可能归因于Hg与不同DOM成分的复合。但是，在所有DOM成分中，只有UVA富黄腐病菌和可见的腐殖质样物质与汞释放水平和总有机碳呈正相关。这些结果表明，不同的OA导致了DOM成分的差异。此外，这些差异可能与汞在孔隙水中溶解的差异有关。因此，应限制FA修正和高水平的FC或HA修正，以减少潜在的Hg释放到孔隙水中。这些结果表明，不同的OA导致了DOM成分的差异。此外，这些差异可能与汞在孔隙水中溶解的差异有关。因此，应限制FA修正和高水平的FC或HA修正，以减少潜在的Hg释放到孔隙水中。这些结果表明，不同的OA导致了DOM成分的差异。此外，这些差异可能与汞在孔隙水中溶解的差异有关。因此，应限制FA修正和高水平的FC或HA修正，以减少潜在的Hg释放到孔隙水中。