Data of Macrolitter accumulation in tidal marsh wrack deposits in a large estuary

Data include variables on item types, uses, provenance, dates, and general and specific sources of macrolitter found in wrack deposits of tidal marshes in the Chesapeake Bay, USA. These data were collected between August and December 2025 in the postdoctoral project of Dr. Ostin Garcés Ordóñez titled “The hidden cost of plastic litter in coastal wetlands: impacts on carbon gas fluxes and blue carbon stocks in mangrove and salt marsh soils,” and were used in the research article “Macrolitter accumulation in tidal marsh wrack deposits in a large estuary,” published in Marine Pollution Bulletin (10.1016/j.marpolbul.2026.119848).本数据集涵盖美国切萨皮克湾潮汐沼泽枯落物堆积层中发现的大型海洋碎屑（macrolitter）的物品类型、用途、溯源信息、采集日期，以及其一般性与具体性来源相关变量。该数据集于2025年8月至12月间采集自奥斯廷·加塞斯·奥尔杜涅斯博士的博士后研究项目，项目标题为"沿海湿地塑料垃圾的隐性成本：红树林与盐沼土壤碳气体通量及蓝碳（blue carbon）储量的影响"；相关数据已被应用于发表于《海洋污染公报》（Marine Pollution Bulletin，DOI: 10.1016/j.marpolbul.2026.119848）的研究论文《大型河口潮汐沼泽枯落物堆积层中的大型海洋碎屑积累》。