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MARINE GEOLOGY and GEOPHYSICS

机译：海洋地质与地球物理

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Soil bulk density (BD), soil organic matter (SOM) content, and a conversion factor between SOM and soil organic carbon (SOC) are often used in estimating SOC sequestration and storage. Spatial variability in BD, SOM, and the SOM-SOC conversion factor affects the ability to accurately estimate SOC sequestration, storage, and the benefits (e.g., land building area and vertical accretion) associated with wetland restoration efforts, such as marsh creation and sediment diversions. There are, however, only a few studies that have examined large-scale spatial variability in BD, SOM, and SOM-SOC conversion factors in coastal wetlands. In this study, soil cores, distributed across the entire coastal Louisiana (approximately 14,667 km~2) were used to examine the regional-scale spatial variability in BD, SOM, and the SOM-SOC conversion factor. Soil cores for BD and SOM analyses were collected during 2006-09 from 331 spatially well-distributed sites in the Coastwide Reference Monitoring System network. Soil cores for the SOM-SOC conversion factor analysis were collected from 15 sites across coastal Louisiana during 2006-07. Results of a split-plot analysis of variance with incomplete block design indicated that BD and SOM varied significantly at a landscape level, defined by both hydrologic basins and vegetation types. Vertically, BD and SOM varied significantly among different vegetation types. The SOM-SOC conversion factor also varied significantly at the landscape level. This study provides critical information for the assessment of the role of coastal wetlands in large regional carbon budgets and the estimation of carbon credits from coastal restoration.
机译：在估算SOC的固存和存储过程中，通常使用土壤容重（BD），土壤有机质（SOM）含量以及SOM与土壤有机碳（SOC）之间的转换因子。 BD，SOM和SOM-SOC转换因子的空间变异性会影响准确估算SOC固存，存储以及与湿地恢复工作相关的收益（例如，土地建设面积和垂直吸积）的能力，例如沼泽形成和沉积物转移。但是，只有少数研究检查了沿海湿地中BD，SOM和SOM-SOC转换因子的大规模空间变异性。在这项研究中，土壤核分布在整个路易斯安那州沿海地区（约14,667 km〜2），用于检验BD，SOM和SOM-SOC转换因子的区域尺度空间变异性。在2006-09年期间，从“沿海参考监测系统”网络中331个空间分布良好的站点收集了用于BD和SOM分析的土壤核心。在2006-07年度，从路易斯安那州沿海地区的15个站点收集了用于SOM-SOC转换因子分析的土壤核心。采用不完全块设计的方差分解图分析结果表明，BD和SOM在由水文盆地和植被类型定义的景观水平上有显着变化。在垂直方向上，BD和SOM在不同植被类型之间差异很大。 SOM-SOC转换因子在景观级别上也有很大差异。这项研究为评估沿海湿地在大型区域碳预算中的作用以及估计沿海恢复的碳信用额提供了重要信息。

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    《Oceanographic Literature Review》 |2017年第7期|1449-1485|共37页
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