A PRELIMINARY STUDY ON THE DYNAMICS OF PARASHOREA CHINENSIS POPULATION IN XISHUANGBANNA REGION, YUNNAN Population Genetic Structure and Differentiaton of Parashorea chinensis(Dipterocarpaceae) DENSITY, STRUCTURE AND BIOMASS OF PARASHOREA CHINENSIS POPULATIONS IN DIFFER ENT PATCHES IN XISHUANGBANNA, SW CHINA A STUDY OF THE ZONATION PATTERN AND STRATIFICA- TION PATTERN OF SHOREA CHINENSIS POPULATION IN XISHUANGBANNA, YUNNAN Changes of Leaf Morphological, Anatomical Structure and Carbon Isotope Ratio with the Height of the Wangtian Tree (Parashorea chinensis) in Xishuangbanna, China STUDY ON FRUITING BEHAVIOUR, SEEDLING ESTABLISHMENT AND POPULATION AGE CLASSES OF PARASHOREA CHINENSIS