重庆四面山亚热带常绿阔叶林种子库研究

对重庆四面亚热带常绿阔叶林不同海拔、不同类型、不同土层的种子库中种子种类、数量、分布特征进行了研究。结果如下：⑴种子库中种子种类和数量随海拔升高而减小；⑵低海拔的种子库生态优势度最高，高海拔次之，中等海拔最低。生态优势度高的种子库物种多样性指数和群落均匀度都低；⑶种子密度随土层加深而减小；⑷山脊林窗种子库数量和种数最少，但损耗率最低，萌发率最高。

SOIL SEED BANKS OF SUBTROPICAL EVERGREEN BROAD-LEAVED FOREST ON SIMIAN MOUNTAIN,CHONGQING

This paper examines variation in the composition and number of seeds in seed banks at three spatial scales:with depth within samples,between different samples within sites,and along an elevation transect in subtropical ever green broad-leaved forest on Simian Mt.,Chongqing. The study shows that: 1) The number of seed and species decreased with lncreasing elevation. 2) Soil seed banks at low elevation have the highest ecological dominance value but the lowest values of diversity and evenness indices. 3) Seed number decreased with depth within soil samples. 4) The number of both seeds and species in ridge gap samples was the lowest in the study,though these sites also had the low est proportion of damaged seeds and the highest proportion of seed germination.