Study on Life-Form Spectrum of Plant Community in Dongling Mountain The Revision of Plant Life- form System and an Analysis of the Life- form Spectrum of Forest Plants in the Warm Temperate Zone of China Statistics Model and Environment Analysis on the Relationship Between Life-Form Spectrum of Main Forest Communities and Climatic Factors in China Characteristics of Riparian Rare Plant Communities on the Shennongjia Mountains,Central China Natural succession and evolution of structural characteristics of forest community in Ziwuling area on the Loess Plateau LIFE FORM SPECTRUM OF VASCULAR PLANTS OF QUERCUS MONGOLICA COMMUNITIES IN NORTH EAST CHINA