Changes in soil seed bank composition during early succession of rehabilitated quarries

摘要: To evaluate the contribution of seed bank to natural revegetation, a soil study was carried out at different phases on three quarries in Hong Kong. A total 2188 seedlings from 57 species were found, among which 36 herbaceous and graminoid plants while 21 woody species. The banks dominated by few annual species, i.e. Ageratum conyzoides, A. houstonianum, Cynodon dactylon, Digitaria longiflora Kyllinga brevifolia, accounted for more than 35% abundance. With ecological development, greater number as well density diversity recorded older rehabilitated sites, indicated that process favors increase richness. However, non-woody predominated all including those even 10 years after rehabilitation. result DCA showed only included 15 native better represented quarry may still be insufficient initiate succession later successional stage. As most dispersed birds, management strategies should take into account possibility enrichment planting with early stage sowing some late