Abstract: This experiment investigated the effects of pre-germination chilling of seeds of 15 species on the subsequent growth and flowering of the plants.Only three of the species (Bromus sterilis, Capsella bursa pastoris and Myosotis arvensis) markedly increased flowering after the seed chilling treatments . The shoot lengths of the seed chilled plants were also significantly greater in the three species. The ecological implications in the reproduction and succession of the population were discussed in relation to possible effects of climatic change on these species.

Key words: Land use change, Land use structure, Relative ecological value, Ecosystem, Regional ecological health