蒙古栎种群种子雨与地表种子库

对黑龙江省帽儿山地区平均年龄为22a和30a的天然蒙古栎种群的种子雨和地表种子库进行了研究。结果表明:该地区蒙古栎种群种子雨一般从8月下旬开始下落到9月下旬结束,种子雨下落强度不均匀,存在高峰期;不同年龄蒙古栎种群的种子雨强度不同,22a和30a蒙古栎种群的种子雨强度分别为11粒/m2和30粒/m2;不同时期下落的蒙古栎种子质量存在差异,中、前期下落的种子发芽率高,千粒质量大,种子质量好;蒙古栎种群地表种子库损耗的主要因素是虫害和动物取食。

Seed Rain and Soil Seed Bank of Quercus mongolica Populations

An experiment was conducted to study seed rain and soil seed bank of 22-year-old and 30-year-old Mongolian oak(Quercus mongolica) populations in Maoershan region,Heilongjiang Province.Results show that the seed rain with a peak fall lasts about one month from the end of August to the end of September,and the falling intensity is uneven.The intensities of seed rain of the two populations are different,which is 11 seeds per square meter for the 22-year-old population and 30 seeds per square meter for the 30-year-old one.Difference in seed quality was found in different falling periods.The seeds falling in the periods of prophase and metaphase have good qualities with a higher 1 000-seed weight and a higher germination rate.The most important factor affecting the dynamics of soil seed bank is the predation by insects and animals.