Study on steroids of Sedum lineare Effect of drought stress using PEG-6000 on the growth and osmotica of Sedum lineare Ecophysiological adaptation of green roof plant Sedum lineare to temperature variation Influence of Trampling Stress on Chlorophyll Fluorescence Characteristics in Four Species of Landscape Ground Covers Influence of Trampling Stress on Chlorophyll Fluorescence Characteristics in Four Species of Landscape Ground Covers Gas exchange of Sedum lineare under drought condition THE EFFECT OF LIGHT WITH DIFFERENT WAVELENGTH OF THE GROMTH AND DEVELOPMENT OF THE STEM-SEGNIENT CULTURE OF SEDUM LINEARE