Promoting success in thin layer sediment placement: effects of sediment grain size and amendments on salt marsh plant growth and greenhouse gas exchange

Thin layer sediment placement (TLP) is a method to mitigate factors resulting in loss of elevation and severe alteration of hydrology, such as sea level rise and anthropogenic modifications, and prolong the lifespan of drowning salt marshes. However, TLP success may vary due to plant stress associated with reductions in nutrient availability and hydrologic flushing or through the creation of acid sulfate soils. This study examined the influence of sediment grain size and soil amendments on plant growth, soil and porewater characteristics, and greenhouse gas exchange for three key US salt marsh plants: Spartina alterniflora, Spartina patens, and Salicornia pacifica. We found that bioavailable nitrogen concentrations (measured as extractable NH4+-N) and porewater pH and salinity were found to have an inverse relationship with grain size, while soil redox was more reducing in finer sediments. This suggests that utilizing finer sediments in TLP projects will result in a more reduced environ..., Coastal marsh plant taxa, including Spartina alterniflora (synonym Sporobolus alterniflorus), Spartina patens (synonym Sporobolus pumilus), and Salicornia pacifica, were obtained from restoration nurseries (Native West Nursery, San Diego, CA & Pinelands Nursery, Columbus, NJ and propagated during the 2018 growing season in a roof-top greenhouse in Philadelphia, PA (39.9539°, -75.1878°) in benthic sediments like those used in thin layer sediment placement projects. Plants were tempered over two weeks to a final salinity of 20‰, using a mixture of water collected from a local marsh at Barnegat Bay, NJ (39.7483°, -74.1931°) and distilled water. Plants were exposed to ambient light conditions under 15% shade cloth, and the greenhouse was outfitted with several fans for temperature moderation. Following a 3x4 factorial design replicated four times, these three plant species were propagated in four types of homogenized sediments of contrasting textures over the course of a growing season ..., , # Promoting success in thin layer sediment placement: effects of sediment grain size and amendments on salt marsh plant growth and greenhouse gas exchange We have presented data and code used for data analysis. Data includes data for experiment 1, where we analyzed soil and plant traits for plants grown in several sediment textures, experiment 2, where we analyzed soil and plant traits for plants grown in coarse sand with several soil amendments (biochar, compost, biochar and compost), and experiment 3, where we grew plants in sediments prone to acidification with and without biochar amendments. ## Description of the data and file structure There are three data files provided: (1) Experiment1AllData_corrected_CH4.cvs; (2) Experiment2AllData.cvs; (3) Experiment3AllData.cvs. ### Experiment 1: Where we analyzed soil and plant traits for plants grown in several sediment textures Experiment1AllData_corrected_CH4.cvs There are 30 fields in this file, consisting of the following column...薄层沉积物投放（Thin layer sediment placement, TLP）是一种用于缓解导致高程损失与水文过程剧烈改变的各类因素（如海平面上升与人为改造）、延长受淹盐沼寿命的技术手段。然而，TLP的实施效果可能存在差异，其诱因包括养分有效性降低与水文冲刷减少引发的植物胁迫，或是酸性硫酸盐土壤的形成。本研究针对美国三类典型盐沼植物——互花米草（Spartina alterniflora）、狐米草（Spartina patens）以及太平洋海蓬子（Salicornia pacifica）——探究了沉积物粒径与土壤改良剂对植物生长、土壤及孔隙水特征，以及温室气体交换过程的影响。研究发现，生物有效态氮浓度（以可提取态NH4+-N计）、孔隙水pH与盐度均与沉积物粒径呈负相关关系，而细粒沉积物中的土壤氧化还原电位更偏向还原环境。这表明在TLP项目中使用细粒沉积物将营造出更强的还原环境…… 本研究所用的滨海沼泽植物类群包括互花米草（Spartina alterniflora，异名Sporobolus alterniflorus）、狐米草（Spartina patens，异名Sporobolus pumilus）以及太平洋海蓬子（Salicornia pacifica），均购自恢复苗圃（加利福尼亚州圣迭戈的Native West Nursery与新泽西州哥伦布的Pinelands Nursery），并于2018年生长季在宾夕法尼亚州费城（39.9539°, -75.1878°）的屋顶温室中，以薄层沉积物投放项目所用的底栖沉积物为基质进行繁育。研究人员使用取自新泽西州巴尼加特湾（39.7483°, -74.1931°）本地沼泽的水与蒸馏水的混合液，将植物驯化两周，使其最终适应盐度为20‰的环境。植物置于15%遮光率的遮阳布下接受自然光照，温室配备多台风扇以调节温度。本研究采用4次重复的3×4析因设计，在一个生长季内，将上述三种植物种植于4种质地各异的均质化沉积物中开展培育实验…… # 提升薄层沉积物投放效果：沉积物粒径与改良剂对盐沼植物生长及温室气体交换的影响 本研究已公开数据分析所用的全部数据与代码。数据集包含三类实验数据：实验1针对不同沉积物质地中培育的植物，分析其土壤与植株性状；实验2针对添加多种土壤改良剂（生物炭、堆肥、生物炭和堆肥）的粗砂中培育的植物，分析其土壤与植株性状；实验3针对添加与未添加生物炭改良剂的易酸化沉积物中培育的植物，开展相关培育与分析。 ## 数据与文件结构说明 本次公开的数据包含3个数据文件：(1) Experiment1AllData_corrected_CH4.cvs; (2) Experiment2AllData.cvs; (3) Experiment3AllData.cvs。 ### 实验1：分析不同沉积物质地中培育的植物的土壤与植株性状 Experiment1AllData_corrected_CH4.cvs 该文件共包含30个字段，具体列信息如下……