Research on the Coriolus versicolor on Poplar Wood DECAY RESISTANCE OF NATURAL DURABLE SPECIES AND THE CHANGES IN AMOUNTS OF MAJOR COMPONENTS DURING DECAY OF WOOD BY CORIOLUS VERSICOLOR AND GLOEOPHYLLUM TRABEUM A STUDY ON PRESERVATIVES APPLICATION AND POPLAR WOOD BUILDING MEMBERS PRESERVATION IN RURAL AREAS Influence of Biological Pretreatment on Saccharification of Bamboo with Cellulase