Capability and limitation of regeneration of Rosa hugonis and Rosa soulieana in the dry valley of the upper Minjiang River

It is always a problem faced by concerned scientists and ecosystem managers to improve to the vegetation and restore the degraded ecosystem in the dry valley of the upper Minjiang River in China.Investigation of seed bank and seedling establishment is the most important work to understand plant natural regeneration,prompt its use in conservation,restoration and management.In order to address the regeneration capacity and its limitation of two native rose species(Rosa hugonis and Rosa soulieane),the characteristics of seeds,seed banks and seedling banks were investigated along the dry valley of the upper Minjiang River.60 soil samples with 15 cm x 15 cm x 5 cm respectively for R.hugonis and R.soulieane were collected to determine the seed densities.20 samples with 2 m x 2 m under the crown were investigated for seedling densities.Seed dormancy was identified as germination percentage of 16-week stratified achenes in 5C refrigerator.Both rose species produced large quantity of seeds with poor quality.Relatively