| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 102 === The planning and design of stream revetment engineering in Taiwan still focus on the security of structure and the convenience and timeliness of construction. Nevertheless, the improvement of original types of revetment or the introduction of new-style engineering has been emphasized under the considerations of environmental benign and habitat diversity. When the security as well as the convenience and timeliness of construction are satisfied, the concepts of landscape ecology and habitat conservation are included to achieve the efficiency of diversified habitat environment.
Total 30 revetments around Wu-Xi Creek Basin in Taichung City, including 10 each of slope revetments, concrete masonry revetments, and gabion revetments, and four plots are established in each revetment for the vegetation survey. The survey data are proceeded Correlation Analysis and vegetation alliance analysis to discuss the factors in revetment vegetation.
The survey results of plant species are recorded 43 families 126 species vascular plants. With Cluster Analysis, the ground cover is classified into 6 plant communities, including – Ⅰ.Panicum type, maximum-Cynodon pilosa var. plectostachyum (Schum.) Pilger Ⅱ.Bidens radiata-Cynodon plectostachyum (Schum.) – Pilger type, Ⅲ.Mikania micrantha - Humulus japonicas type, Ⅳ.Rhynchelytrum repens (Willd.) C. E. Hubbard - Bidens pilosa var. radiate type, Ⅴ.Pueraria wontana (Lour.) Merr - Pennisetum purpureum type, and Ⅵ.Pueraria wontana (Lour.) Merr - Mucuna macrocarpa Wall type, where Bidens pilosa var. radiata-Cynodon plectostachyum (Schum.) - Pilger type appears the widest distribution. Bidens pilosa var. radiate, Panicum maximum, Pueraria wontana (Lour.) Merr, and Pennisetum purpureum are the top four dominant plants in the plot, and the sum of dominance ratio of native species in the plot is merely 35%.
In regard to the revetment vegetation efficiency, slope revetments show the best vertical vegetation continuity, followed by gabion revetments; slope revetments present the best horizontal vegetation continuity, followed by gabion revetments; slope revetments appear the best green looking ratio, followed by gabion revetments; and, slope revetments reveal the best vegetation species diversity, followed by concrete masonry revetments. What is more, the factors in revetment vegetation are proceeded Correlation Analysis, and the results show the correlations with off-shore land area vegetation structure, off-shore water area vegetation structure, tree-shrub ratio in the plot, perennial herbaceous plants ratio in the plot,
and off-shore land use.
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