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首页> 外文期刊>Estuarine Coastal and Shelf Science >The role of elevation, relative sea-level history and vegetation transition in determining carbon distribution in Spartina alterniflora dominated salt marshes
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The role of elevation, relative sea-level history and vegetation transition in determining carbon distribution in Spartina alterniflora dominated salt marshes

机译：海拔，相对海平面历史和植被转变在确定互花米草占主导地位的盐沼中碳分布中的作用

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Spartina alterniflora salt marshes are among the most productive ecosystems on earth, and represent a substantial global carbon sink. Understanding the spatial heterogeneity in the distribution of both above- and below-ground carbon in these wetland ecosystems is especially important considering their potential in carbon sequestration projects, as well as for conservation efforts in the context of a changing climate and rising sea-level. Through the use of extensive field sampling and remote sensing data (Light Detection and Ranging - LiDAR, and aerial images), we sought to map and explain how vegetation biomass and soil carbon are related to elevation and relative sea-level change in a S. altemiflora dominated salt marsh on Galveston Island, Texas. The specific objectives of this study were to: 1) understand the relationship between elevation and the distribution of salt marsh vegetation percent cover, plant height, plant density, above-and below-ground biomass, and carbon, and 2) evaluate the temporal changes in relative sea-level history, vegetation transitions, and resulting changes in the patterns of soil carbon distribution. Our results indicated a clear zonation of terrain and vegetation characteristics (i.e., height, cover and biomass). In the soil profile, carbon concentrations and bulk densities showed significant and abrupt change at a depth of similar to 10-15 cm. This apparent transition in the soil characteristics coincided temporally with a transformation of the land cover, as driven by a rapid increase in relative sea-level around this time at the sample locations. The amounts of soil carbon stored in recently established S. alterniflora intertidal marshes were significantly lower than those that have remained in situ for a longer period of time. Thus, in order to quantify and predict carbon in coastal wetlands, and also to understand the heterogeneity in the spatial distribution of carbon stocks, it is essential to understand not only the elevation, the relative sea-level rise rate, and the vertical accretion rate - but also the history of land cover change and vegetation transition. Published by Elsevier Ltd.
机译：互花米草盐沼是地球上生产力最高的生态系统之一，代表着重要的全球碳汇。考虑到它们在固碳项目中的潜力以及在气候变化和海平面上升的情况下的保护工作，了解这些湿地生态系统中地上和地下碳分布的空间异质性尤其重要。通过使用广泛的野外采样和遥感数据（光检测和测距-LiDAR和航空图像），我们试图绘制地图并解释植被生物量和土壤碳如何与南半球海拔和相对海平面变化相关。在得克萨斯州加尔维斯顿岛上，盐蒿占主导地位的盐沼。这项研究的具体目标是：1）了解海拔和盐沼植被覆盖率百分比分布，植物高度，植物密度，地上和地下生物量以及碳之间的关系，以及2）评价时间变化在相对的海平面历史中，植被过渡以及土壤碳分布模式的变化。我们的结果表明了地形和植被特征（即高度，覆盖率和生物量）的明确分区。在土壤剖面中，碳浓度和堆积密度在接近10-15厘米的深度处显示出明显且突然的变化。土壤特征的这种明显过渡在时间上与土地覆盖的变化相吻合，这是由于这段时间在样品位置附近相对海平面的迅速增加所致。最近建立的互花米草潮间带沼泽地中的土壤碳储量明显低于那些原地保持较长时间的土壤碳。因此，为了量化和预测沿海湿地的碳，并了解碳储量空间分布的异质性，不仅要了解海拔，相对海平面上升率和垂直吸积率，还至关重要。 -还有土地覆盖变化和植被过渡的历史。由Elsevier Ltd.发布

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