Th e In fluences of C losing for Afforesta tion on Vegetation DiversityRestora tion under Ch inese F ir P lan ta tion

By density control and 6 years. closed and non-closed managemen t for Ch inese fir pure stands, it wasfound tha t short-term c losing had no sign ificant influence on the overall performance of Chinese fir p lantation, butremarkably affected the vegetation b iodiversity and growth under fores.t In closed area, therewere 116 plant speciesbe longing to 101 genera of 60 families, with the vegetation coverage 85%, wh ile in the non2c losed area, therewereon ly 88 p lant species be longing to 78 genera of 49 families, the vege tation coverage was about 60% . Furthermore,there existed a woody vegetation layer with the height> 2 m in closed area. The resu lt of key trait value analysisshowed that the re lative density, re lative coverage and some other important tra its in closed area were h igher thanthat in non-closed area. In c losed area, F icus hispida had the highest importance value: 100. 43%, and other 16species had the importance value no less than 35%, wh ich occup ied 13. 79% of tota l undergrowth species. In non-closed area, Gelsemium elegans had the highest importance va lue ( 34. 77% ) and therewere no specieswith importance value \ 35%. The dominance of undergrowth in closed area wasmore obvious than that in non-closed area.