Mechanisms that regulate seed germination through environment factors are important aspects of a species' life history. The response of seed germination to environment was a main character for plant in its life history. Changium smyrnioides Wolff is an endangered species in Umbellaceae, and its seedlings are rare in natural habitat. Anthriscus sylvestris (L.) Hoffm. is a non-endangered species belongs to the same family, its distribution area is wide and the seedlings are numerous in habitats. In this study...