Understanding tidal marsh trajectories: evaluation of multiple indicators of marsh persistence
Understanding tidal marsh trajectories: evaluation of multiple indicators of marsh persistence
复制标题
了解潮汐沼泽轨迹：评估沼泽持久性的多个指标
DOI：
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发表时间：
2019
影响因子：
6.7
通讯作者：
K. Raposa
中科院分区：
文献类型：
--
作者：
K. Wasson;N. Ganju;Z. Defne;C. Endris;T. Elsey‐Quirk;K. Thorne;Chase M. Freeman;G. Guntenspergen;D. Nowacki;K. Raposa
对生态系统稳定性进行强有力的评估对于为养护和管理决策提供信息至关重要。潮汐沼泽生态系统提供重要的服务，但在全球范围内受到人为改变物理和生物过程的威胁。已经采取了各种监测和建模方法来确定哪些潮汐沼泽可能持续到未来。在这里，我们进行了最强大的比较沼泽指标迄今为止，建立在两个基础研究，以前和独立开发的沼泽条件的指标。我们的特点对沼泽湿地对比轨迹的沼泽覆盖在美国的六个地区，使用遥感和实地为基础的指标相结合。我们还量化了沼泽转换为泥滩/开放水域在这12个沼泽的十年趋势。我们的研究结果表明，量化的植被分布在海拔梯度的指标是最好的指标沼泽轨迹。无植被与植被的比例和涨落潮泥沙差异也是有价值的指标。没有单一的度量普遍预测沼泽轨迹，因此，一个更强大的方法包括一套空间集成，大部分是从遥感获得的尺度尺度。从表面高程表和标记层的数据显示，退化沼泽可以有更高的垂直加积和海拔增益比更完整的同行，可能是由于更长的淹没时间可能与内部再循环的材料相结合的速度。相对于当地海平面上升的高海拔增益率一直被认为是沼泽持久性的关键，但我们的研究结果表明，它也可以作为一个签名的退化沼泽已经开始恶化。这项调查，严格的比较和集成的指标最初独立开发，在广泛的地理范围内进行测试，提供了一个模型，协作科学开发管理工具，以改善保护成果。
Robust assessments of ecosystem stability are critical for informing conservation and management decisions. Tidal marsh ecosystems provide vital services, yet are globally threatened by anthropogenic alterations to physical and biological processes. A variety of monitoring and modeling approaches have been undertaken to determine which tidal marshes are likely to persist into the future. Here, we conduct the most robust comparison of marsh metrics to date, building on two foundational studies that had previously and independently developed metrics for marsh condition. We characterized pairs of marshes with contrasting trajectories of marsh cover across six regions of the United States, using a combination of remote-sensing and field-based metrics. We also quantified decadal trends in marsh conversion to mudflat/open water at these twelve marshes. Our results suggest that metrics quantifying the distribution of vegetation across an elevational gradient represent the best indicators of marsh trajectories. The unvegetated to vegetated ratio and flood-ebb sediment differential also served as valuable indicators. No single metric universally predicted marsh trajectories, and therefore a more robust approach includes a suite of spatially-integrated, landscape-scale metrics that are mostly obtainable from remote sensing. Data from surface elevation tables and marker horizons revealed that degrading marshes can have higher rates of vertical accretion and elevation gain than more intact counterparts, likely due to longer inundation times potentially combined with internal recycling of material. A high rate of elevation gain relative to local sea-level rise has been considered critical to marsh persistence, but our results suggest that it also may serve as a signature of degradation in marshes that have already begun to deteriorate. This investigation, with rigorous comparison and integration of metrics initially developed independently, tested at a broad geographic scale, provides a model for collaborative science to develop management tools for improving conservation outcomes.
DOI：
10.5194/hess-2016-225-rc1
发表时间：
2016
期刊：
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影响因子：
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作者：
N. Ganju;Z. Defne;M. Kirwan;S. Fagherazzi;A. D’Alpaos;L. Carniello
通讯作者：
N. Ganju;Z. Defne;M. Kirwan;S. Fagherazzi;A. D’Alpaos;L. Carniello