Data for paper "Influence of landscape characteristics and submerged aquatic vegetation on sediment carbon and nitrogen storage in brackish-water habitats

This dataset includes the data behind the paper "Influence of landscape characteristics and submerged aquatic vegetation on sediment carbon and nitrogen storage in shallow brackish-water habitats". We quantify the amount of organic carbon (C_org) and total nitrogen (TN) in shallow bay sediments (0-25 cm) in the brackish Baltic Sea and assess how it varies with morphometric isolation from the sea, catchment characteristics and abundance of brackish-water vegetation. We sampled sediment (3-4 sediment cores per bay), surveyed submerged vegetation and derived landscape characteristics from maps and satellite imagery. A full description of the data and methods for data collection is given in the published paper.The file "Data per bay" includes data on sediment characteristics, aquatic vegetation and landscape characteristics for the nine study bays. The sediment characteristics are mean values for the 3 to 4 cores per bay (data in "Data per core"). Vegetation characteristics were derived both for the vegetation community directly around the sampling stations (data in "Data per core") and for the vegetation community in the entire bay. The data was used for PLS regression modelling to assess the relative importance of different factors on sediment carbon and nitrogen.The file "Data per core section" includes sediment data in each section of the sediment cores, which were used to plot sediment profiles and calculate mean and total sediment characteristics in the upper 25 cm. The cores were sectioned in three parts: 0-5 cm (A), 5-12.5 cm (B) and 12.5-25 cm (C).The file "Data per core" includes mean and total sediment characteristics for the upper 25 cm in all sediment cores. It also includes water depth and vegetation characteristics at the sampling stations. This data was used to test for differences in sediment characteristics between the bays.The file "Patches in 3 bays" includes data from an additional small-scale sampling of patches with vegetation and unvegetated patches in three of the bays. Here, we only sampled the upper 5 cm of sediment in the patches.

本数据集包含支撑论文"浅咸淡水生境景观特征与沉水植被对沉积物碳氮储量的影响"的相关数据。我们定量测定了波罗的海咸淡水浅湾沉积物（0~25 cm层）中的有机碳（C_org）与总氮（TN）储量，并评估其随海湾与海洋的形态学隔离程度、流域特征以及咸淡水植被丰度的变化规律。我们采集了沉积物样品（每个海湾采集3~4根沉积物岩芯），调查了沉水植被，并通过地图与卫星影像提取景观特征参数。该论文已完整阐述本数据集的细节与数据采集方法。

"Data per bay"（各海湾数据）包含9个研究海湾的沉积物特征、水生植被与景观特征数据。其中沉积物特征为每个海湾3~4根岩芯的平均值（单根岩芯数据详见"Data per core"（单岩芯数据））。植被特征同时涵盖采样站点周边的植被群落数据（详见"Data per core"）与整个海湾范围内的植被群落数据。本数据集曾用于偏最小二乘（PLS）回归建模，以评估不同因子对沉积物碳氮储量的相对重要性。

"Data per core section"（各岩芯分层数据）包含沉积物岩芯各分层的相关数据，用于绘制沉积物剖面并计算表层25 cm沉积物的平均与总特征。岩芯被分为三层：0~5 cm（A层）、5~12.5 cm（B层）以及12.5~25 cm（C层）。

"Data per core"（单岩芯数据）包含所有沉积物岩芯表层25 cm的平均与总沉积物特征，同时包含采样站点的水深与植被特征数据。该数据集被用于检验不同海湾间沉积物特征的差异。

"Patches in 3 bays"（三个海湾的斑块数据）包含额外的小尺度采样数据，涵盖三个海湾内的植被斑块与无植被斑块。本研究仅采集了这些斑块表层5 cm的沉积物样品。