| Summary: | 碩士 === 臺灣大學 === 生物環境系統工程學研究所 === 97 === To evaluate the effects of ecological engineering applied to the slopeland after restoration due to natural hazards, in this study, a site on a slopeland, stably reconstructed by using ecological engineering was selected to investigate the rehabilitation ability of natural environment by means of the method of vegetation analysis. In addition, the succession condition of local vegetation were also assessed to find out the environment conditions affecting the growth of vegetation, so that these findings may be used for accelerating vegetation succession and stabilizing the slopelands.
The selected site was the Er-pa-zi Park, located in Xindion, Taipei county, Taiwan. The site was damaged by a heavy rainfall in June, 2004, and consequently mass movement occurred. Since the mass movement area was in the park, slopeland ecological engineering methods were implemented to reconstruct, so that the original vegetation and environment may be restored. In this study, thirty-six plots were set up and distributed in the site. Among the plots, fourteen were in the area rehabilitated by ecological engineering and twenty-two in the area of the adjacent natural forest. For all plots, twelve environmental factors were surveyed. After the analyses of the Two-Way Indicator Species Analysis （TWINSPAN）, Detrended Correspondence Analysis （DCA）, Matrix Cluster Analysis （MCA） and floristic composition, the results showed that the site had a high level of diversity and the Ficus fistulosa - Schefflera octophylla was identified as the primary vegetation type. It could be stated that after rehabilitation, the restored forest was similar to the adjacent natural forest, indicating that local vegetation was under spontaneous succession. Plant species distribution in the site was mainly affected by altitude, moisture and topography. The results also showed that restoration was more successful on the lower parts of the slope; accordingly it is suggested that more improvements are needed on the upper slopes.
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