Study on the Vegetation of Salt Marsh in Qigu, South Taiwan

• Main Authors: WANG, YU-JEN, 王昱仁
• Other Authors: HSIEH, TSUNG-HSIN
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/92519079627315292998

碩士 === 國立臺南大學 === 生態暨環境資源學系環境生態碩士班 === 105 === Qigu used to be a major area of the aquaculture industry. However, with the socio-economic change in the recent years, most of the fish farms in Qigu are no longer productive and have been deserted. Without the human intervention, the deserted fish farms gradually evolves into marshes. The major focuses of this study are as follows: first, the vegetation society in the marshes; second, the seasonal changes of vegetation in deserted fish farm, and third, the relationship between vegetative distribution and environmental gradients. Vegetation analysis will be applied on these studies. The main population of plants in Qigu marshes were herb. Poaceae is considered to be the dominant species, since the important value of Sporobolus virginicus, Paspalum vaginatum, Imperata cylindrical and Phragmites australis was as high as 79.4. Moreover, according to TWINSPAN, the vegetation in deserted fish farms can be classified into six types, i. e., Imperata cylindrica type, Sporobolus virginicus type, Sporobolus virginicus- Paspalum vaginatum type, Paspalum vaginatum type, Phragmites australis type, and Suaeda maritima type. In conclusion, the diversity of plant species in deserted fish farms is low. As for the seasonal difference, the vegetation analysis shows that there is no obvious differences between seasons in vegetative type in these deserted fish farms. The observation may attribute to the influence from dominant plants. Dominant plants barely changed between seasons which lead to the result of the analysis. Seasonal difference could be observed if dominant plants were excluded. Therefore, dominant plants are contributed to the seasonal difference of vegetation in Qigu marshes. Additionally, distribution of plants in the deserted fish farms can be divided into three groups based on land elevation and plant heights: a first group, Phragmites australis and Paspalum vaginatum with heights between 55.8~82.9 cm; a second group, Sporobolus virginicus, Suaeda maritima and salt barren with heights of 85.1~108.3cm; and a last group is dominant plant I. cylindrical, which has a height between 112.1~142.7cm. At last, the result of canonical correspondence analysis indicates that habitats between dominant plants are different. Paspalum vaginatum and Phragmites australis thrive in high flooded stress area, which is low-lying, moist and close to water. On the contrary, Sporobolus virginicus and Suaeda maritima grow in an arid environment, which is dry, saline and away from water. Furthermore, I. cylindrical is covers the area with high elevation and low salts, which has lower in environmental stress.