| Seeds are defined as units of sexual reproduction developed from a fertilized ovule containing an embryo and play a key role in plant life cycles. Influence of it on establishment and settle of seedling, structure of population and succession of community were studied in abroad. On the contrary, the study for seed ecology is taken lately in China. So, the relationships of seed mass with fruit types and life forms, the influence on seed germination by treatment with different hormones, the impact of seed mass on regeneration of seedling, the mechanism of seed dispersal, relationship of seed mass and seed dispersal with seed settle and structure of population were examined by measuring the size of 74 kinds of fruits and its seeds and taking a experiment of germination on 67 kinds of seeds to expound the character of seed ecology of common trees in Jinyun Mountain and offer basically scientific theory for introduction of local plants.With promisingly ornamental value of being exploited, the four species Beilschemidia kweichowensis, Machilus pingii, Daphniphyllum oldhamii, and Elaeocarpus japonicus were used to carry out an experiment on growth of seedling and then their seedlings were transplanted into 5 different plots selected from Jinyun Mountain and were cultivated in greenhouse under mixed combination with different light intensity and various matrix and the growth of seedling was observed at certain interval to examine influence of multiple environmental factors on growth of seedling, and relationships of seed distribution and seed propagate with establishment of populations and patterns of communities.1.In our works, all 74 species seeds exhibit high variation among fruit types, life forms and families. The most of plants fruit belong to four fruit types: drupe (34 sp), berry (15 sp), capsule (12 sp) and nut (6 sp) and the seed mass of drupe and nut is larger, heavier than others. For example, the weight of largest seed, Beilschmiedia kweichowensis's (drupe), is 105-fold heavier than of smallestseed, Phyllagathis fordii var. Micrantha (capsule). The variation of seed size suggested the plant life for adapting the different conditions.2.In the greenhouse, 38 species of all 67 species may germinate, including 10 evergreen arbors, 9 deciduous arbors, 12 evergreen shrubs and 7 deciduous shrubs. GA influenced significantly the rate or speed of seed germination. After GA treatments, the germinated rate of 3 species had no change, 23 species could be increased markly, and 12 species was increased certainly, 29 species couldn't germinate with or without GA. In addition to, F Test showed no correlation between the seed mass and the seed germinated rate.3. The correlation lied in between seedling growth and treatments or different sites. The results suggested the ecological factors could strongly influence the performance of seedlings. Seedling performance varied strongly to cope with the difference in light, soil nutrient regime. Seed size effected seedling emergence, survival and seedling size. Large seed had a significantly greater probability of emergence at most studies. The effects of size were expressed strongly during the early part of the life cycle, for example Beilschmiedia kweichowensis. For Beilschmiedia kweichowensis, Machilus pingii, Daphniphyllum oldhamii, and Elaeocarpus japonicus, the growth had the higher speed or survival in the bamboo forest; the mortality was highest in the bare habitat in the fields; and the highest RGR (relate growth rate) of Beilschmiedia kweichowensis present in the evergreen forest. The results indicated the seedling growth tied up with its stands.With different treatments, the growth of four species exhibited different performance, and all four species performance better in humus than in sand. The growth of Beilschmiedia kweichowensis is stable in high or low light, but in lower light its mortality is the lowest, and its growth supplied by its seed was better than without seed. Machilus pingii seedling in dense treatment had the higher RGR or the lower mor... |
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