Marsh vertical accretion via vegetative growth
Marsh vertical accretion via vegetative growth
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DOI：
10.1016/j.ecss.2006.05.041
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发表时间：
2006-09-01
影响因子：
2.8
通讯作者：
Patrick, William H., Jr.
中科院分区：
文献类型：
--
作者：
Nyman, John A.;Walters, Russel J.;Patrick, William H., Jr.
沿海沼泽因海平面上升和沉降而垂直堆积。淤积不足以及随后沿海沼泽向开放水域的转变通常归因于矿物沉积不足，因为人们普遍认为矿物沉积可以控制淤积。使用 Cs-137 测年来确定垂直积聚、矿物沉降和有机物积累，我们发现在路易斯安那州沿海的各种条件下，积聚随着有机物积累而不是矿物沉降而变化，包括土壤中 80% 矿物质的稳定沼泽。这些结果与之前的研究一致，但没有提出任何机制来解释通过营养生长的增加。在一项探索性温室实验中，我们发现洪水刺激了沼泽表面上方的根系生长。这些结果表明需要进行额外的工作来确定洪水是否通过刺激沼泽表面上的根部生长而不是通过沼泽表面上的矿物质积累来控制某些沼泽的增生。如果假设而不是测试沉积物与矿物沉积之间的关系，则侧重于矿物沉积的恢复或管理可能无效。 (c) 2006 Elsevier Ltd. 保留所有权利。
Coastal marshes accrete vertically in response to sea-level rise and subsidence. Inadequate accretion and subsequent conversion of coastal marshes to open water generally is attributed to inadequate mineral sedimentation because mineral sedimentation is widely assumed to control accretion. Using Cs-137 dating to determine vertical accretion, mineral sedimentation, and organic matter accumulation, we found that accretion varied with organic accumulation rather than mineral sedimentation across a wide range of conditions in coastal Louisiana, including stable marshes where soil was 80% mineral matter. These results agreed with previous research, but no mechanism had been proposed to explain accretion via vegetative growth. In an exploratory greenhouse experiment, we found that flooding stimulated root growth above the marsh surface. These results indicated the need for additional work to determine if flooding controls accretion in some marshes by stimulating root growth on the marsh surface, rather than by mineral accumulation on the marsh surface. Restoration or management that focus on mineral sedimentation may be ineffective where a relationship between accretion and mineral sedimentation is assumed rather than tested. (c) 2006 Elsevier Ltd. All rights reserved.