关键词: 湿地, 植物, Hg, 三江平原

Abstract: In this paper, the size class structure and the static life table and survival curve of Ceratoides arborescens population in North China were figured out, based on the basal diameter size and on the surviving number in each size-class and the number of filial generations. A time sequence prediction chart was established to predict the numeric dynamics of the population, and the population’s reproductive strategy was analyzed. The relationships between the numerical dynamics and reproductive characteristics of the population were also discussed. The age structure of the population showed that both young and old individuals were few, while middle-aged individuals were relatively rich. The analysis of the life tables and survival curves indicated that the survival curve of the population belonged to Deevey Ⅲ. Time sequence prediction suggested the number of old individuals would be increased at the beginning, and decreased over time. All these life-history traits suggested that the C. arborescens population in North China had some characteristics with both r-and k-strategies. Reproductive fitness played a critical role in the species’ development. The species’ reproductive strategies were related to the numerical dynamics of C. arborescens population characterized by age structure, life table, survival curve, and time sequence prediction figure. The dynamics of the population coincided with its reproductive biological characteristics, such as low efficiency of pollination system, malnutrition during embryonic development, and low conversion rate from seeds to seedlings, and the population recruitment depended severely on adult plants. Hostile environments in the habitat and human disturbance were also the main factors restricting the population development.

Key words: Wetland, Plant, Mercury, Sanjiang Plain