浙江天童山小叶青冈种群种子雨和地表种子库动态研究

对浙江天童山小叶青冈山坡(种群1)和沟谷(种群2)立地类型2个种群的种子雨及地表种子库动态状况进行研究,结果表明:种子雨持续时间达64 d,11月底—12月上、中旬为种子散落盛期,占总数散落量的60%;小叶青冈的种子产量高,种子雨散落的平均密度大,种群1和种群2的密度分别为515.3粒.m-2和478.4粒.m-2;在地表种子库中,完好种子的存留密度分别为16个.m-2和11个.m-2,动物捕食是种子受损的主要原因,2个种群分别占89.2%和90.5%;小叶青冈种群高的种子产量、低的种子存留率等环节限制了低山青冈种群的天然更新。

Dynamic Study on Seed Rain and Soil Seed Bank of Cyclobalanopsis gracilis Population on Tiantong Mountain, Zhejiang Province

This paper studied dynamics of seed rain and seed bank of Cyclobalanopsis gracilis population in the hillside and valley of two sites in Tiantong Mountain.The results showed that:the duration of seed rain last for 64 days,from the end of November to the first 20 days of December was the seed scattering peak period,it accounted for 60% of the total number of scattering;the seed yield and average scattered density of Cyclobalanopsis gracilis was very high.The density of population 1 and 2 were 515.3 m-2 and 478.4 m-2;in the soil seed bank,the good seed retention densities were 16 m-2 and 11 m-2,animal predation was the main reason for damage to the two groups,accounted for 89.2% and 90.5%;The seed yield of high Cyclobalanopsis gracilis populations and seed retention rate of low populations limited the regeneration of low Cyclobalanopsis gracilis population.