Study on the Influence for Watershed Landscape Ecology by Earthquakes and Typhoons
地震、台风对集水区景观生态的影响

The landscape, being changed as a result of anthropological or natural disturbance, is a heterogeneous land area composed of cluster of interacting ecosystem that is repeated in various sizes, shape, and spatial relationships. Evaluating the transition of landscape can understand that ecosystem processes are being influenced by disturbance. For this reason, it is essential that using appropriate mapping techniques and quantitative methods to assess landscape condition within different disturbance regimes. Landscape metrics were calculated for segmented areas of homogeneous land use in watershed to allow understanding and characterization of ecosystem. The Chen-Yu-Lan watershed, located in the central of Taiwan, is a sensitivity area for disaster such as earthquakes and typhoons. In this study we focus on how the natural disaster affect landscape pattern. The remote sensing technology has great potential for acquiring the detailed and accurate land use information for management and planning of watershed. Hence, we choice four time series SPOT images to evaluate the influence for watershed by earthquakes and typhoons.The study shows that landscape metrics can measure the effect of typhoon and earthquake disturbance regime. The analysis shows that evaluating landscape transition can contribute more detailed information for managing management and monitoring.