Vegetation Analysis of Coastal Wasteland

• Main Authors: Chen-kai Hsiao, 蕭丞凱
• Other Authors: Tsung-Hsin Hsieh
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/47106917066244640448

碩士 === 國立臺南大學 === 環境生態研究所碩士班 === 99 === In this research, 317 plots were applied in sandy wasteland and dried fish farm. According to the result, 68 species belonging to 25 families have been recorded and the most species belong to Gramineae and Compositae. This result indicates that the diversity of this field is low. Cynodon dactylon, Imperata cylindrical and Phragmites australis are the dominant species in this area. According to the result of TWINSPAN, the vegetation types can be classified into six types, i. e., Paspalum vaginatum type, Bidens pilosa type, Lmperata cylindrica type, Cynodon dactylon type, Suaeda nudiflora - Phragmites australis type and Sporobolus virginicus type. Phytophenological characteristics are highly connected with the local weather. Majority of the species exhibit the peak of florescence from April to June, and the period of fruiting is after florescence, from May to August. The number of flowers and fruits enhanced with increasing temperature. After October, the rainfall amounts decreased sharply, so as to the number of flowers and fruits. Besides, the Shannon-Wiener index of serious burned land is higher than the mild one and the Simpson index of mild burned land is higher than the serious one. Therefore the diversity of mild burned land is lower than the serious one and the dominant species are little. At beginning of recovery period, there were a lot of Cynodon dactylon root remaining under land, therefore Cynodon dactylon became the dominant species. On the other side, a lot of Compositae plants which spread fruits by wind generated in the serious burned land. The relative coverage of naturalized species is lower than the native species except for Bidens pilosa. Result from salty land, Suaeda nudiflora - Phragmites australis type is not suitable for naturalized species, however Bidens pilosa type is the proper environment because of the dry sandy field. Although the relative coverage of Bidens pilosa is 5%, the relative frequency is not low. This indicates Bidens pilosa has been spreading rapidly in this area which may threaten native species.