ANALYSIS OF PARENTAGE FOR NATURALLY ESTAB LISHED SEEDLINGS OF CYCLOBALANOPSIS GLAUCA

Parentage of Cyclobalanopsis glauca seedlings in a small population was analyzed by genetic exclusion and most likely analysis using five polymorphic isozymic loci.The cumulative exclusion probability was 71.57%.Genetic exclusion only identified one parent pair for one seedling, and most seedlings have more than one pair of parent.Likelihood analysis identified one or two parent pairs for the seedlings.41.18% of the total seedlings were grown from seeds produced by selfing and 17.65% of the seedlings were from seeds fertilized with pollen out of the population.Reproductive success (RS) of adults varied greatly.RSof nine adults was 0, and individual No.24 had the highest RS(39.4%).The RSof plants out of the population was 18.4%. Dispersal distances of C.glauca seeds calculated according to the distance of seedling to parent were mainly 5～10 m(625%), secondly was 10～15 m and only 3.1% was <5m.Though gravity is the main mechanism of seed dispersal, there were less seeds with short distance dispersal due to high slope (30°) and effects of tree canopy on the seed germination and seedling development.