Study on the Adaptation of Certain Species to Light Condition Under the Deciduous Broad-leaved Forests in Southern Germany?aTaking the Forest Communities in Kra ichtal, Germany as an Example Studies on the Development of Green Roofs in China——Contrast with Germany, Beijing European fossil fruits of Sphenotheca related to extant Asian species of Symplocos Schmeissneria: An angiosperm from the Early Jurassic