[Effects of burial on seed germination characteristics of 65 plant species on Horqin semi-arid steppe].

The study on the germination characteristics of newly collected and one year-buried seeds of 65 plant species on Horqin semi-arid steppe showed that after one year's burial, the seeds of 38 plant species still remained their vitality. For the species whose freshly collected seeds had a germination rate higher than 80%, the seed germination rate after burial was decreased, while it was in adverse for those whose freshly collected seeds had a germination rate less than 80%. The effects of burial on seed germination varied with the ecological types of the species (i.e., weed, steppe species, meadow species, and psammophytes). After one year's burial, the germination rate of perennials had no significant increase, but that of annuals increased significantly (P < 0.05). The species with a < 10% difference of germination rate between their freshly collected and one year-buried seeds could be classified into three categories, according to the seed germination pattern, i.e., germination was promoted by burial (e.g. Artemisia halodendron), restrained by burial (e.g. A. sieversiana); and unchanged after burial (e.g. Lappula myosotis).