STUDIES ON TYPICAL PRIMITIVE BROAD-LEAVED PINUS KORAIENSIS FOREST COMMUNITY IN WHICH WILD GINSENG DISTRIBUTES NATURALLY AND ITS CHARACTERISTICS Analysis on Natural Distribution and Related Factors of Tylenchulus semipenetrans in Fujian Province The natural distribution and biological characteristics of Ampelomyces quisqualis in the Qinling Mountains The Natural Distribution and Utilization of Rattan Resources in China The Natural Distribution and a Brief Account in the Introduction of Parakmeria lotungensis The Na tura l D istr ibution Investiga tion and Cultiva tionTr ia l of Paph iopedilum a rm en iacum Natural Distribution,Drought-resistant Nature and Moisture Physiology of Fine Host Trees for Lac Insects Research on the Bio-ecological Characteristics of Daemonorops margaritae