以闽江口琅岐岛天然朴树防护林林下、林隙2种生境为对象，采用离地收集种子的方法，连续定位观测了朴树种子雨的数量动态。结果表明：朴树种群种子雨是从9月下旬开始，一直到次年的1月结束；林下的种子雨总量和完好种子比例，均极显著高于林隙内（P＜0．01）；林隙内种子雨量具有时空异质性特征，这对林隙内朴树更新格局产生深刻影响。总体上，林隙内南北向的种子雨，高于东西向的。林下与林隙内，朴树种子雨高峰期有所不同，林隙内种子雨高峰期在9月下旬到10月中旬；而林下的是在11月下旬到12月中旬，林下的种子雨在9月下旬到10月中旬也有一个小高峰。林隙内种子雨主要受天气因素影响；而林下的种子雨既受朴树生物学特性影响，又受天气因素影响。朴树在林隙内主要采用实生更新，不是因为种子源比林下多，而是林隙内环境更适合其种子萌发和幼苗生长。%We studied the temporal and spatial distribution of the seed rain of Celtis sinensis population to reveal the mechanism of natural regeneration of the population in Langqi Island of Minjiang Estuary.We selected two kinds of micro-habitats ( un-derstory and forest gap) with the seed rain quantity of C.sinensis population.The seed rain lasted from late September to the end of the following January, the total seed rain number and proportion of intact seeds in understory were significantly higher than those of forest gaps (P5>4>2>1>9>7>8>6, the difference between the total seed rain number and proportion of intact seeds in the third traps reached the extremely significant than the sixth, seventh, eighth and ninth sample plots ( P<0.01) .The total seed rain number was higher in north-south than east-west in gap.There were differences about the peak time of seed rain between understory and forest gap, the seed rain reached the peak in late September to mid-October in gap, as well as in late No-vember to mid-December, and late September to mid-October in understory.The seed rain in gap was mainly affected by weather factors ( wind, rain) , and the seed rain in understory was influenced by the biological characteristics of C.sinensis and the weather factor.Seedlings of C.sinensis were dominated in gaps, and the reason was the environment was more suit-able for the seed germination and seedling growth, rather than the seed number in gap were larger than that in understory.
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