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首页> 外文期刊>Estuarine Coastal and Shelf Science >Hydrodynamics affect plant traits in estuarine ecotones with impact on carbon sequestration potentials
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Hydrodynamics affect plant traits in estuarine ecotones with impact on carbon sequestration potentials

机译：流体动力学影响河口生态胞菌的植物性状，影响碳封存电位

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Estuaries are highly productive ecosystems that play an important role in carbon fixing. The amount of carbon fixed by temperate brackish marshes depends, among others, on the biomass produced, its decomposition and the organic carbon stored in the soil. Here, we assumed that the functional trait composition of the vegetation both responded to environmental drivers and affected production, decomposition rate of native biomass and soil organic carbon, in addition to direct links between environmental drivers and these ecosystem properties. We tested a set of detailed hypotheses with a partial least squares structural equation model and quantified wave height, inundation period, salinity, soil nutrients, species abundances and as traits the leaf area, specific leaf area, stem bending properties and investment per plant organ, as well as above-ground standing biomass, decomposition rates of native and control biomass (hay) and soil organic carbon (SOC). There was no direct relationship between environmental drivers and ecosystem properties, except with the decomposition of control hay. All other linkages involved the functional composition of the vegetation. Increasing inundation period simultaneously decreased plants traits like stem stiffness, leaf area, specific leaf area and mass fraction of stems and leaves, which were aggregated in a new trait 'aboveground module'. Total plant biomass decreased in communities on higher elevations with reduced wave height. Here, increased investment in the aboveground trait module resulted in higher aboveground community biomass and SOC but decreased the decomposition of native plant material, which in turn was higher in the low lying vegetation zones. Increasing total plant biomass also increased SOC, but not aboveground community biomass. Both the aboveground trait module and total plant biomass were response and effect traits, by responding to the environmental drivers and affecting carbon related ecosystem properties. At lower elevation with higher inundation and higher wave height, SOC was lower than the product of standing biomass and decomposition rate, which could be a proxy of the expected SOC. This may indicate an export of dead plant material to higher elevations or further downstream. Due to sea level rise, the area of estuarine vegetation may decrease because a fixed dike line along the river prevents landward migration, which can reduce the amount of biomass produced and with it the potential to store SOC. Restoration of the tidal marshes or realignment of the dikes may be necessary to protect the ecosystem properties and services of estuarine vegetation.
机译：河口是高生产率的生态系统，在碳固定中发挥着重要作用。温带咸沼固定的碳量在于产生生物质，其分解和储存在土壤中的有机碳。在这里，我们假设植被的功能性状组成既应响应环境司机和受影响的生产，天然生物质和土壤有机碳的分解率，除了环境司机与这些生态系统性质之间的直接联系。我们通过部分最小二乘结构方程式模型和量化波高，淹没时期，盐度，土壤养分，物种丰度和叶面积，特定叶面积，茎弯曲性能和每植物器官投资的特征，以及地上的站立生物质，天然和对照生物质（干草）和土壤有机碳（SoC）的分解率。环境司机与生态系统性质之间没有直接的关系，除了控制干草的分解之外。所有其他键涉及植被的功能组成。增加淹没时期同时减少茎刚度，叶面积，特异性叶面积和茎叶和叶片的质量分数等植物特征，其在新的特质'地上模块'中聚集。植物生物量在较高的波浪高度升高的凸起中减少。在这里，增加了地上特征模块的投资导致地上的地上群落生物量和SoC，但减少了天然植物材料的分解，在低位植被区又高。增加植物生物量增加也增加了SoC，但不是地上的社区生物量。通过响应环境司机并影响碳相关生态系统性质，地上特征模块和总植物生物质是响应和效果性状。在较低的淹没和较高波浪高度较低的高度，SOC低于常设生物量和分解率的产物，这可能是预期的SOC的代理。这可能表明死亡植物材料的出口到更高的高度或进一步下游。由于海平面上升，河口植被的面积可能会减少，因为沿河的固定堤防线可以防止陆地迁移，这可以减少产生的生物质量，并借助储存SOC的潜力。可能需要恢复潮汐沼泽或调整堤防，以保护河口植被的生态系统性质和服务。

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