This Land is Your Land, This Could Be Marsh Land: Property Parcel Characteristics of Marsh Migration Corridors in Rhode Island, USA

These data on Rhode Island property parcels and salt marsh migration projections support a project analyzing their overlap. Salt marshes, critical habitats offering many ecosystem services, are threatened by development, sea level rise (SLR) and other anthropogenic stressors that are projected to worsen. As seas rise, some salt marshes can migrate inland if there is adjacent, permeable, undeveloped land available. Facilitating marsh migration is necessary for coastal resilience efforts, but extensive coastal development can make finding suitable migration corridors challenging. This work seeks to characterize the changes in land use, ownership, and economic value at the property parcel level within projected 2050 marsh extent for the state of Rhode Island, USA. We find that most parcels currently containing salt marsh are publicly owned, whereas most adjacent parcels projected to contain new salt marsh in 2050 are privately owned. Additionally, parcels containing new marsh in 2050 have 47% higher per-hectare assessed values than parcels containing current marsh. We describe the locations and characteristics of parcels within migration corridors with the lowest per-hectare values that may be the most cost-effective for marsh conservation practitioners to protect. This study highlights the expanding land use types and landowner sets that will be involved in marsh conservation decisions, and the economic value of potential migration corridors where costly tradeoffs may be necessary to promote coastal resilience.本数据集涵盖美国罗德岛州地块（property parcel）数据与盐沼（salt marsh）迁移预测结果，用于支撑二者重叠性分析的相关研究项目。 盐沼作为提供多重生态系统服务的关键生境，正面临开发活动、海平面上升（SLR）及其他人为胁迫因素的威胁，且上述威胁预计将持续加剧。随着海平面抬升，若周边存在可渗透的未开发土地，部分盐沼可向内陆迁移。推动盐沼迁移是提升海岸韧性的必要举措，但大规模沿海开发使得寻觅适宜的盐沼迁移廊道极具挑战。 本研究旨在针对美国罗德岛州2050年预测盐沼分布范围内的地块，刻画其土地利用、所有权属性与经济价值的变化特征。研究发现，当前分布有盐沼的地块多为公有产权，而预计到2050年将成为新增盐沼用地的相邻地块则大多为私有产权。此外，预计2050年将成为新增盐沼用地的地块，其单位公顷评估价值较当前盐沼地块高出47%。 本研究还梳理了迁移廊道内单位公顷评估价值最低的地块的位置与特征，这类地块或为盐沼保护从业者开展保护工作时成本效益最优的选择。本研究凸显了未来将参与盐沼保护决策的土地利用类型与产权主体范围的扩张态势，以及潜在盐沼迁移廊道的经济价值——为提升海岸韧性，对这类廊道的保护往往需要做出代价不菲的权衡取舍。