长白山地区胡桃楸种群的种子雨和种子库动态

The dynamics of seed rain and seed bank of Juglans mandshurica population in the Changbai Mountain.

该文对长白山地区阔叶树种核桃楸的种子雨和种子库动态进行了研究 .结果显示 :胡桃楸种子雨过程从每年 8月 2 2～ 2 5日到 9月 2 4～ 2 8日 ,其中 9月 10～ 17日是集中落果期 ,落果数量占总数的 6 1.1% .啮齿动物的搬运和啃食是造成胡桃楸种子库亏损的主要因素 ,动物搬运果实的数量达到总量的 85 .8% .胡桃楸种子的自然萌发率降低 ,仅为 0 .5 4% .其果实大而重 ,种子雨传播距离很近 。

This paper focuses mainly on the dynamics of seed rain and seed bank of Juglans mandshurica, an important tree species widely distributed over the Changbai Mountain, northeast of China. The results show that the seed rain lasted near 1 month. It was very intensive from 10 to 17 September, and the falling fruit accounted for 61.1% of the total. Removal and predation by rodents were the most important factors affecting the soil seed bank fate and dynamics. The seeds not entering into soil in time and existing in the soil surface resulted in that they were found by rodents, and the number by animal removing was 85.8 % of all falling fruits. The natural germination rate in the field was only 0.54%. The spreading of seed rain was near to the trees due to big and heavy fruits.