| 1. | The study shows that the early and late seed rains of constructive tree species in evergreen broadleaved forest at chongqing simian mountain had no activity . the bigger the seeds of the species and the earlier or later the seeds of the species matured , the higher the proportion of the seed rain damaged by animals . the quantitative variation of seed rain , active seed rain and seed bank did not take place at the same time . at early time , the number of seed banks of castanopsis fargesii , lithocarpus glabra , quercus myrsinrefolia , castanopsis plasyacantha , cinamomum subavenium . which own more active seed rain increased by geomitric series . the seed banks of castanopsis orthacantha and schima argentea were small , only survived a short time , and did not sprout next year . the quantitative dynamics of seed banks and their increasing or decreasing rates were decided by the proportion damaged by animals , dying speed of seeds and their resistance to pathogens and adverse circumstances , and the state of seed germination
对重庆四面山常绿阔叶林建群种种子雨、种子库的研究表明,建群种早期和晚期的种子雨无活力;种子偏早或偏晚成熟及大籽粒的树种,其种子雨被取食的比例大;种子雨、有活力种子雨、种子库三者的数量变化不一致;有活力种子雨量较大的栲、石栎、小叶青冈、扁刺栲、香桂等,其种子库密度在早期以近几何级数的方式增长,元江栲、银木荷种子库小,存在时间短,翌年无一年生萌发苗;种子库数量动态、消减率动态决定于种子被取食的强度、种子衰老的速度以及种子对病菌、逆境的抗性和种子萌发的整齐性 |
