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本文对二滩库区群落优势树种锥连栎林土壤种子库和幼苗分布格局进行了调查研究 ,结果表明 :(1)锥连栎群落土壤种子库不存在霉烂种子 ,虫蛀种子的数目较少 ,仅为 2 0 8个 /m2 ;而败育种子和种子壳数目相对较多 ,平均密度分别达到 4 2 78个 /m2 和 4 2 96个 /m2 。 (2 )锥连栎土壤种子库组成中完好种子的密度为0 2 8个 /m2 ;雨季已萌发的种子密度为 0 92个 /m2 。 (3)土壤种子库各组成的垂直分布较为明显 ,随土层厚度加深而减少 ,但霉烂种子例外。 (4)经测算 ,锥连栎种子散布后的主要命运是动物捕食和转移 ,种子的保存率和萌发率分别仅占到单个树木种子产量的 0 5 9%和 1 95 %。 (5 )在锥连栎树木分布的上坡有较多的萌生苗 ,而下坡实生苗的数量较多。 (6 )距树干距离不同 ,萌生苗和实生苗的分布模式有差异
In this paper, the distribution pattern of soil seed bank and seedling in coniferous-brown oak forests of Eupatorium fortunei community in Ertan reservoir area was investigated. The results showed that: (1) There was no mildew seeds in the soil seed bank in the coniferous oak community, , With only 208 leaves per m2; while the number of aborted seeds and seed husks was relatively large, with an average density of 4278 per m2 and 4296 per m2, respectively. (2) The density of intact seeds in the soil seed bank of Poncirus pectinirostris was 0 28 / m 2; the density of seed germination in rainy seasons was 0 92 pcs / m 2. (3) The vertical distribution of soil seed bank composition is obvious, with the deepening of the soil thickness to reduce, but the exception of the rotten seeds. (4) It is estimated that the main fate of Quercus acutissima seed is the predation and transfer of animals. The preservation rate and germination rate of seeds account for only 0 59% and 1 95% of the seed yield of a single tree respectively. (5) There is more sprouting on the ascending slope of coniferous oak trees, while the number of down-hill seedlings is more. (6) The distance from the trunk is different, the distribution patterns of sprouting and seedling are different