Abstract: A basic variable index system for urban ecologization evaluation was built from the aspects of five competent supporting sub-systems of urban ecosystem, and the technical method for dynamic sieving of the key evaluation index was established. In addition, the concept of urban ecologization index (UEI) was defined, and the corresponding calculation method was proposed. Furthermore, the status box plot of urban ecologization was designed, and the theoretical structure of quantitative analysis on urban ecologization level was constructed. The quantitative evaluation of current ecologicalization status of Shanghai showed that this city is at the initial stage of urban ecologicalization, and its further development is facing double challenge both from integrity and from constitutes.

Key words: Citrus, High temperature stress, Photosynthesis, PSⅡ