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首页> 外文期刊>Estuarine Coastal and Shelf Science >Defining the ecogeomorphic succession of land building for freshwater, intertidal wetlands in Wax Lake Delta, Louisiana
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Defining the ecogeomorphic succession of land building for freshwater, intertidal wetlands in Wax Lake Delta, Louisiana

机译：定义路易斯安那州Wax Lake Delta的淡水潮间带湿地土地建设的生态地貌演替

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摘要

Land building in deltaic environments occurs when sediment discharged from a river mouth is deposited subaqueously and transitions to subaerial land. The transition from subaqueous deposition to subaerial land is a critical process that marks the creation of relatively stable land, yet it is unclear what controls the speed and style of this transition. We define how this transition, herein termed the land building succession, varies in time and space for the freshwater, intertidal wetlands in Wax Lake Delta, LA. Using remote sensing and field data we classify land cover into sediment, water, or vegetation classes at maximum and minimum biomass. We see two succession patterns within Wax Lake Delta. Deltaic islands near the apex are initially covered by sediment and open water. Through time, open water and sediment coverage decreases as vegetation coverage increases. On the other hand, distal islands show little sediment exposure through time. In both cases, all deltaic islands become covered with vegetation by 2015. As vegetation colonizes the island, the topography organizes into two platforms vertically separated by similar to 0.35 m. The lower, intertidal platform occurs in the island interiors and is commonly inundated by water and dominated by subaqueous or floating vegetation. The upper, subaerial platform occurs along island edges and is dominated by a variety of vegetation species including Salix nigra, Colocasia esculenta, and Polygonum punctatum. It takes an average of similar to 10 years for the intertidal platform to transition to the subaerial platform. These two platforms are separated by the tidal range measured in Atchafalaya Bay, and the different vegetation communities occupying each platform suggest they are a manifestation of multiple stable states and arise due to vegetation and sedimentation feedbacks. (C) 2017 Elsevier Ltd. All rights reserved.
机译：三角洲环境中的土地建设是指从河口排放的沉积物在水下沉积，然后过渡到空中土地。从水下沉积到陆地过渡是一个关键过程，标志着相对稳定的土地的建立，但目前尚不清楚是什么控制了过渡的速度和方式。我们定义了这种过渡（以下称为土地建设演替）如何在洛杉矶蜡湖三角洲的淡水，潮间带湿地的时间和空间上发生变化。利用遥感和野外数据，我们以最大和最小生物量将土地覆盖物分为沉积物，水或植被类别。我们看到了蜡湖三角洲内的两种演替模式。顶点附近的三角洲岛最初被沉积物和开放水覆盖。随着时间的流逝，开放水和沉积物的覆盖率会随着植被覆盖率的增加而减少。另一方面，随着时间的推移，远端岛几乎没有沉积物暴露。在这两种情况下，到2015年所有三角洲岛屿都将被植被覆盖。随着植被在该岛上殖民，地形逐渐组织成两个垂直间隔约0.35 m的平台。下部潮间带平台位于岛屿内部，通常被水淹没，并以水下或浮游植物为主。上层的空中平台位于岛屿边缘，主要由多种植物种类组成，包括黑柳（Salix nigra），欧洲香芋（Colocasia esculenta）和何首乌（Polygonum punctatum）。潮间带平台向空中平台过渡平均需要大约10年的时间。这两个平台被在阿查法拉亚湾测得的潮差所分隔，并且占据每个平台的不同植被群落表明它们是多种稳定状态的体现，并且是由于植被和沉积物的反馈而产生的。 （C）2017 Elsevier Ltd.保留所有权利。

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