Effect of dikes on the distribution and characteristics of Phragmites australis in temperate intertidal wetlands located in the South Sea of Korea
Effect of dikes on the distribution and characteristics of Phragmites australis in temperate intertidal wetlands located in the South Sea of Korea
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DOI：
10.1007/s12601-015-0004-6
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发表时间：
2015-03-01
影响因子：
1.3
通讯作者：
An, Soonmo
中科院分区：
文献类型：
--
作者：
Lee, Jiyoung;An, Soonmo
我们调查了韩国芦苇（单倍型P）的分布格局和它们与环境因素的关联（高城）和（居满）的堤坝河口。古曼河口潮间带湿地的洪水持续时间为25%至68%（平均40%），这是世界各地芦苇栖息地常见的范围。芦苇生境的间隙水盐度随潮汐变化而变化。上覆水矿化度对孔隙水矿化度的影响只有在一定高度以上（上覆水深度约30 cm）时才表现出来。高盐度经常观察到上覆水和孔隙水的古曼，但芦苇可能能够生存与定期暴露于淡水，这缓解了高盐度的压力。然而，芦苇经历了有限的增长，在一些地区，洪水频率高，但淡水的影响是低的。孔隙水盐度的连续测量（两周）表明，芦苇根际附近的盐度是由潮汐和淡水的影响之间的平衡。芦苇在高城河口被发现在海拔约100厘米低于Guman和芦苇生长是在高城比Guman大。我们假设，较低的洪水持续时间和孔隙水盐度，导致堤防建设，使芦苇扩展到低海拔地区的高城。目前的研究表明，沿海开发，包括盐度结构和洪水持续时间的变化对芦苇分布的影响。
We investigated the Korean Phragmites australis (haplotype P) distribution patterns and their association with environmental factors in estuaries with (Goseong) and without (Guman) a dike. The intertidal wetland of the Guman River Estuary has a flooding duration of 25% to 68% (average 40%), a range common to Phragmites habitats around the world. Porewater salinity in the Phragmites habitat of the Guman varied with the tides. Salinity of the overlying water influenced the salinity of pore-water only if flooding was above a certain height (overlying water depth of about 30 cm). High salinity was frequently observed in overlying water and pore-water of the Guman but the Phragmites may be able to survive with periodic exposure to freshwater, which relieves high salinity stresses. However, Phragmites experienced limited growth in some regions where flooding frequency was high but freshwater influence was low. Continuous measurement (two weeks) of pore-water salinity suggests that the salinity near the Phragmites rhizosphere is determined by the balance between the tidal and freshwater influences. Phragmites in the Goseong River Estuary was found at elevations about 100 cm lower than in the Guman and Phragmites growth was larger in the Goseong than in the Guman. We hypothesized that lower flooding duration and pore-water salinity, resulting from dike construction, allowed Phragmites to expand into lower elevation areas in the Goseong. The current study demonstrates the effects of coastal developments involving salinity structure and flooding duration changes on Phragmites distribution.