【摘要】 对种子雨的来源及其降落进行了研究，结果表明：种子雨的来源取决于各种植物结实的种子数量．６０ 种植物单株结实的种子数量有很大差异，禾草种子数量相对较少，杂类草较多，一、二年生植物的种子数量亦多．种子雨的降落，是通过独立、风力、附着、动物和原地等散布形式来实现的．单位面积上种子的数量取决于群落的种类组成和有结实能力的植株．通过实测和模拟，单位面积上可能降落的种子数量相差不大，前者为１６７６３ 粒·ｍ － ２ ，后者为１８５３６ 粒·ｍ － ２ ．不同刈割处理，可能降落的种子数量不同，一年割一次的平均为８５２５±９２４６ 粒·ｍ － ２ ，割一年休一年的为５９３６±２８３５ 粒·ｍ － ２ 和对照为６５９３±４６５４ 粒·ｍ － ２ ．各处理内的不同样方亦有很大的差异更多还原

【Abstract】 This paper deals with the source of seed rain and its falling,the results is that the source of seed rain is determinted by the seed amount of plants.The seed amount of single plant stoky of 60 plants have great difference.The seed amount of grasses is relatively low,the seed amount of forbs and therophyte,biannial plant are high,The falling of seed rain is caused by following dispersal mode such as unassisted,wind force,adhesion,animal and originl land.The seed amount on unit area is determinted by the composition of community and plant of having ability of stoky.Through reality determining and simulation,the difference of falling seed amount on the unit area isn′t great,the former is 16 763 grain·m -2 ,the later is 18 536 grain·m -2 .The difference mowing probably cause different falling seed amount.The seed amount is 8 525±9 246 garin·m -2 in the treatment of mowing once a year,in the treatment of mowing a year and stopped next year,and in the contrast treatment the seed amount is \{5 936\}±2 835 garin·m -2 and 6 593±4 654 garin·m -2 .There is great difference in different samples of every treatments.更多还原