[논문]Distribution properties of Phragmites australis and Phacelurus latifoilus in the tidal-flat of Suncheon Bay

Min, Byeong-Mee

doi:10.5141/ecoenv.2015.006

[국내논문] Distribution properties of Phragmites australis and Phacelurus latifoilus in the tidal-flat of Suncheon Bay 원문보기

Journal of ecology and environment, v.38 no.1, 2015년, pp.57 - 65

Min, Byeong-Mee (Department of Science Education, Dankook University)

Abstract ▼ AI-Helper

A natural mixed stand of Phragmites australis and Phacelurus latifolius was studied to clarify the distribution properties in a microsite in a tidal flat of Suncheon Bay. The height, density, and biomass of the shoots, as well as the biomass of the root system, were monitored for both species along with the altitude on a mound from June 2010 to October 2013. Firstly, the mean height and dry weight of both species were similar during the growth season. However, individual variations of the sizes of plants in the same species were noticeable. Secondly, the density and dry weight per unit area of P. latifolius increased, but that of P. australis decreased with the altitude on the mound. Thirdly, the root system (rhizomes and roots) of P. latifolius was mostly located in the upper layer (up to 20 cm depth), while that of P. australis was in the lower layer (over 70 cm depth) of the sediment. The roots of P. australis penetrated to the lower parts of the water table, while the roots of P. latifolius did not make contact with free water of the sediment. Fourthly, the removal of the shoot in the early growth season led to a visible reduction of biomass in the late growth season. The reduction rate was larger in P. latifolius than in P. australis. Lastly, in the area where the mound was removed, the density of P. australis increased in the first two years (2010-2011) and was highly sustained inthe last two years (2012-2013). However, the density of P. latifolius was low, and this plant was distributed at the edge of the mound only.

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문제 정의

The aim of this study was to clarify the cause of coexistence of small P. latifolius patch in the large P. australis patch. For this purpose, mean sizes of plants, densities with altitude, and effects of mound removal were monitored in a mixed stand of P.

제안 방법

australis patch. For this purpose, mean sizes of plants, densities with altitude, and effects of mound removal were monitored in a mixed stand of P. australis and P. latifolius for 4 years on a tidal flat in Suncheon Bay.

대상 데이터

The study area was located on a tidal flat in the Suncheon Bay, Nongju-ri, Byeolryang-myeon, Suncheon-city, Jeonnam Province, Korea (34°51′59.04″ N, 127°31′02.26″ E) (Fig. 1).
2). The dimensions of this site were 1 m wide, 1.4 m long, and 30 cm high at the maximum. The shoots of the two species were monitored for 4 years.

성능/효과

australis. In the last year when the sediment piled up to 30 cm in height from the level of the removed mound, the densities of the two species were reversed, revealing that the altitude had the greater effect on distribution of P. latifolius and P. australis, rather than competition between the two species.
The density of both species was generally proportioned to the altitude, although inversely to each other, where the density of P. latifolius was the highest in the center subquadrats while that of P. australis it was the lowest in the same subquadrats (Fig. 9).
The following conclusions can be made based on the above results. Firstly, since the mean heights and dry weights of the two species were similar, the two species competed for the sunlight but one was not superior to the other. Generally, competition for sunlight between two perennial herbs results in similar height, so that vegetation forms one layer (De Kroon 1993, Hara 1993).
Secondly, in the permanent subquadrat, the density was predominantly higher for P. latifoilus than for P. australis. The density of P.
australis in the central subquadrat, which altitude was the highest. However, the densities of the two species at the two lower ends were similar to each other, making P. australis a predominant species at the low altitude and P. latifolius at the high altitude, respectively. Halophytes in tidal flat are sensitive to altitude and vegetation forms an evident zonation (Emerry et al.

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