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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sea level and turbidity controls on mangrove soil surface elevation change
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Sea level and turbidity controls on mangrove soil surface elevation change

机译：海平面和浊度对红树林土壤表面海拔变化的控制

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Increases in sea level are a threat to seaward fringing mangrove forests if levels of inundation exceed the physiological tolerance of the trees; however, tidal wetlands can keep pace with sea level rise if soil surface elevations can increase at the same pace as sea level rise. Sediment accretion on the soil surface and belowground production of roots are proposed to increase with increasing sea level, enabling intertidal habitats to maintain their position relative to mean sea level, but there are few tests of these predictions in mangrove forests. Here we used variation in sea level and the availability of sediments caused by seasonal and inter-annual variation in the intensity of La Nina-El Nino to assess the effects of increasing sea level on surface elevation gains and contributing processes (accretion on the surface, subsidence and root growth) in mangrove forests. We found that soil surface elevation increased with mean sea level (which varied over 250 mm during the study) and with turbidity at sites where fine sediment in the water column is abundant. In contrast, where sediments were sandy, rates of surface elevation gain were high, but not significantly related to variation in turbidity, and were likely to be influenced by other factors that deliver sand to the mangrove forest. Root growth was not linked to soil surface elevation gains, although it was associated with reduced shallow subsidence, and therefore may contribute to the capacity of mangroves to keep pace with sea level rise. Our results indicate both surface (sedimentation) and subsurface (root growth) processes can influence mangrove capacity to keep pace with sea level rise within the same geographic location, and that current models of tidal marsh responses to sea level rise capture the major feature of the response of mangroves where fine, but not coarse, sediments are abundant.
机译：如果淹没程度超过树木的生理耐受性，则海平面上升将威胁到沿岸的红树林。但是，如果土壤表层的高度可以与海平面上升的速度相同，那么潮汐湿地可以跟上海平面上升的速度。提议随着海平面的增加，土壤表面的沉积物增加和地下的根部增加，使潮间带生境保持相对于平均海平面的位置，但是在红树林中很少有关于这些预测的试验。在这里，我们使用了La Nina-El Nino强度的季节性和年度间变化所引起的海平面变化和沉积物的可利用性，来评估海平面上升对地表高程增益和贡献过程（地表增生，下沉和根系生长）。我们发现，土壤表面海拔随平均海平面（在研究期间变化超过250毫米）和在水柱中细小沉积物丰富的地点的浊度而增加。相反，在沉积物是沙质的地方，地表升高的速率很高，但与浊度的变化没有显着关系，并且很可能受到将沙子输送到红树林的其他因素的影响。根系生长与浅层地面沉降减少有关，但与土壤表层海拔升高无关，因此可能有助于红树林保持海平面上升的能力。我们的结果表明，表层（沉降）过程和表层下（根系生长）过程都可以影响红树林的能力，以保持同一地理位置内海平面上升的步伐，并且当前的潮汐沼泽对海平面上升的响应模型体现了该区域的主要特征。沉积物丰富但不粗糙的红树林的响应。

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