Abstract: In view of the deteriorating urban ecosystem, a combination of landscape pattern index, water environment parameters, and socio-economic indicators was adopted to build an urban ecosystem health assessment index system. Based on self-similarity theory and fractal theory, the system fractal dimension was calculated, and the link between the fractal dimension and ecosystem health was set up to quantitatively evaluate the urban ecosystem health status and analyze its dynamic trend at different stages of urbanization. By analyzing and calculating the ecosystem fractal dimension of Huzhou City in 1997, 2001, and 2005, the fractal dimensions in the three years were obtained, which were 0.8934, 1.1723, and 1.2619, respectively, foreshowing that the urban cosystem of the City was growing towards an unhealthy condition. This study indicated that the development of Huzhou City’s urbanization had made a negative effect on the urban ecosystem, and thus, more attention should be paid to the ecological and environmental protection during urban planning and onstruction in the future.

Key words: stable isotopes, gladius, jumbo squid, migration patterns, feeding habits.