Abstract:

By using the spatial series to replace temporal courses, the authors selected four typical sampling sites representing different successive stages in innerriver wetland in Zhenjiang City, and then investigated the laws of vegetation community, e.g., species composition, species diversity and lifeform in order to establish restoration approaches for degraded vegetation communities. The species diversity, species composition and lifeform along different successive stages differed from each other significantly. In general, there was an increasing trend in species richness and species diversity along different successive stages, with the highest richness and diversity observed in the midlast successive stages; the evenness degree increased continuously, while ecological dominance declined progressively along with succession. For lifeform composition, along with succession process, the importance value of perennial herbaceous plants declined firstly and then increased, while the species number of perennial herbaceous plants increased gradually and became relatively steady in later successive stages, and perennial herbaceous plants were dominant in all successive stages. As to annualbiennial herbaceous plants, the importance value and species number increased firstly and then declined. The total number of family and genera increased gradually as succession proceeded, and Gramineae were dominant species at all time.

Key words: inner river wetland, succession stage, species diversity, life form