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Vegetation and Greenery of the Salterns in Taiwan
There were six salterns in Taiwan. Up to now, only three salterns are still under operation. Abandoned salt pans have naturally succeeded to salt marshes or mangroves which have become important habitats for waterfowls. This investigation is concerned with soil and water properties, water level, plant distribution, seasonal fluctuation, greenery plants and technique.The water salinity of salt pans was affected by seawater input, rainfall and evaporation. From October to April of the next year, seawater was introduced for salt production, and electrical conductivity could reach 60.9 mScm-1. In rainy season, the brines was somewhat diluted. The pH of salt pan soils was above 8. The vascular plants at the salterns include 106 species belonging to 32 families. There are only 24 species of halophytes at the salt pans under operation where soil and water salinity are extremely high. The primary plants are Sesuvium portulacastrum, Sporobolus virginicus, Suaeda maritima , Paspalum vaginatum, Lumnitzera racemosa and Avicennia marina. Plant cover was affected by water level and seasonal changes. The cover of Suaeda maritima and Paspalum vaginatum were particularly affected by water level.Generally, plants firstly established at the soil banks, and then invaded the concentrating ponds. Sesuvium portulacastrum was the pioneer plant of succession, then followed by other halophytes such as Sporobolus virginicus, Suaeda maritima, Paspalum vaginatum, Lumnitzera racemosa, and Avicennia marina, and then Phragmites communis, Typha orientalis, Pluchea indica, Sesbania cannabiana, Ludwigia octovalvis, Bothriochloa intermedia, Imperata cylindrica var. major and Bidens pilosa. Then nonhalophytic shrubs Based on the results of field experiments, Lumnitzera racemosa and Avicennia marina showed high survival rates and were suitable for greenery at the abandoned salt pans under proper hydrological conditions. This investigation also provides suggestions of the greenbelt establishment at the abandoned salt pans which converted to waterfowl sanctuary.
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