中文摘要：

塔里木河下游植物繁殖体形态对土壤种子库垂直分布的影响研究结果表明，1）中度大小的种子在土壤种子库中的数量和出现的频次占很大优势。与小种子相比，土壤种子库中繁殖体重量较大的种子在表层土壤中的数量和出现的相对频次最丰富；2）繁殖体方差与种子数量和出现频次间呈“驼峰”型关系。近似圆形的种子住表层土壤中占的比例较高，在深层土壤中的比例较低，而扁平、细长的种子则表现为相反的趋势。繁殖体形状对土壤种子库中种子在各土层中出现相对频次影响不大；3）土壤种子库中种子数量和出现频次与单位体积的繁殖体重量（M／V）呈显著正相关关系。与单位体积重量偏小和偏大的种子相比，单位体积重量居中的种子在表层土壤中的数帚和出现的相对频次最丰富。

英文摘要：

The influence of seed morphology on the vertical distribution of a soil seed bank in the lower reaches of the Tarim River was studied and several conclusions were drawn. 1） Neither small nor large seeds were abun dantly distributed. Medium-sized seeds were abundant and broadly distributed. Compared with small seeds, large seeds were more abundant in the surface soil; 2）A ＂hump＂ relationship was found between dispore variance and abundance of the seeds in the soil seed bank. Circular-shaped seeds in the surface soils were abundant but in deeper soil layers were not abundant. Flat seeds showed the was found between abundance of seeds in the soil seed bank and se op ed posite trend; 3） A positive relationship weight/seed volume （M/V）. Compared with a small M/V or large M/V, medium seeds were more abundant in the surface soil.