生境异质性对刺五加种子萌发的影响及其种子库动态

本文通过定位观测研究了中国东北红松阔叶林及其次生林下重要灌木刺五加种子在异质生境中转化为幼苗的差异，人工落叶松林下模拟种子库的动态。结果表明：人工落叶松林下的转化率最高，为１６．８％。以下顺序为蒙古栎林下为４．ｌ％，白桦林下为２．７％，人工红松林下为０．８％，硬阔叶林下为０．５％。人工落叶松林下模拟种子库中刺五加种子的寿命为４ａ。幼苗输出率第２年为１４．５％，第３年为１０．１％，第４年为１．８％。其它输出为：腐烂３３．ｌ％；生理衰老２２．３％；鼠类捕食１４．１％，但其很不稳定，这与鼠类种群数量动态有关。昆虫和土壤动物捕食最少，仅１．２７％。

THE HETEROGENEOUS HABITAT INFLUENCE ON THE SEED GERMINATION OF ACANTHOPANAX SENTICOSUS AND ITS SEED POOL DYNAMICS

The differences of seed germination of A.senticosus in heterogeneous habitats have been studied in this paper. The results showed that the transformation rate from seeds to seedlings was in the following order:16. 8% in larch plantation, 4.1 % in Mongolian oak forest,2.7% in birch forest,1. 8% in Korean pine plantation, and 0.5 % in hardwood forest.The life-span of the seeds was determined to be four years estimated by simulation seed pool in larch platation. The percentages of the seedling output was 14. 5 % in the 2 nd year,10. 1 % in the 3 rd year, and 1. 8% in the 4 th year. Besides, the other seed output included 33. 1 % for decaying, 22. 35 % for senescence, 14. 1 % predation by mice, with changed with the vari-ation in number of mouse,and only 1. 27 % predation by insects and other soil animals.