Vegetation and water-table relationships in a hydrologically restored riparian meadow
Vegetation and water-table relationships in a hydrologically restored riparian meadow
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DOI：
10.1672/08-15.1
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发表时间：
2009-08
期刊：
影响因子：
2
通讯作者：
C. Hammersmark;M. Rains;A. C. Wickland;J. Mount
中科院分区：
文献类型：
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作者：
C. Hammersmark;M. Rains;A. C. Wickland;J. Mount
我们研究了水文恢复河岸草甸地下水位升高和植物群落分布之间的关系。草甸，毗邻熊溪在东北部加州，经历了水文修改，由于“池塘和塞”流恢复。植物物种组成和覆盖范围内取样128个地块，水文模型被用来模拟一个为期三年的时间序列的水位为每个阴谋。TWINSPAN将植被划分为4个群落类型：大穗马蹄/细穗马蹄、Downingia bacigalupii /短裸盖蕨、白苔草/灯心草和草地早熟禾/雀麦。非度量多维尺度被用来调查群落类型和水文变量之间的关系。社区类型分布沿着的水文梯度在合理的相似的位置，发现在以前的研究; howeverCarex nebrascensis，一个物种经常被用作指示器的浅水位，发生在更大的水位深度比其他研究报告。在这个草甸的水位深度的范围大于以前观察到的，大概是由于较高的时间分辨率的水位测量，除了在熊溪流的间歇性。这项研究提供了更多的了解草甸群落的生态，并可用于改善设计和目标设置在未来的恢复项目。
We examined the relationship between water-table elevations and plant community distributions in a hydrologically restored riparian meadow. The meadow, adjacent to Bear Creek in northeastern California, experienced hydrologic modification due to “pond and plug” stream restoration. Plant species composition and cover were sampled within 128 plots, and a hydrologic model was used to simulate a three-year time series of water-table for each plot. TWINSPAN was used to classify the vegetation into four community types:Eleocharis macrostachya / Eleocharis acicularis, Downingia bacigalupii / Psilocarphus brevissimus, Carex nebrascensis / Juncus balticus, andPoa pratensis / Bromus japonicus. Nonmetric multidimensional scaling was utilized to investigate the relationships between community types and hydrologic variables. Community types were distributed along the hydrologic gradient at reasonably similar positions to those found in previous studies; howeverCarex nebrascensis, a species frequently used as an indicator of shallow water tables, occurred at greater water-table depths than reported in other studies. The range of water-table depths in this meadow was greater than previously observed, presumably due to the higher temporal resolution of water-table measurements, in addition to the intermittent nature of stream flow in Bear Creek. This study provides an increased understanding of the ecology of meadow communities, and can be utilized for improved design and objective setting in future restoration projects.