Change analysis on Chinese forest construction from year 1950 to 2003．

Chinese forest construction was analyzed based on the data of six forest inventories from year 1950 to 2003, and a conclusion was drawn that both the forest area and volume had been increased greatly after more than 50 years of cultivation, protection and utilization, ie forest area increased by 111.74% compared with that of the early stage of our country founding, while forest volume only increased by 17.4%. Also the forest construction varied enormously: the percentages of artificial forest area and volume had been increased gradually, among which the area percentage of artificial forests had been increased from 4.49% in 1964 to 33.77% in 2003; although the area and volume percentages of natural forests had been decreased obviously, the percentage of the natural forest volume still occupied most of the whole forest volume and it was 89.65% in 2003; the ratios of area and volume of coniferous forests had been decreased gradually from that above 70%. Now the ratio of the coniferous to the broadleaved is almost 1∶1, and the construction of dominant trees has changed extremly: most commercial forests that have good quality, such as Korean pine, Mongolian pine, Armand pine, etc, have been almost cut over; forest construction has changed to younger, per unit volume has decreased, and little forest resources can be cut and used; the structure of forest function types has been adjusted greatly, ie economic and protective forests have been increased obviously, while commercial forests have been decreased enormously, and they almost have equal area and volume. The management problems have been brought out and it is showed that forest management is on the initial stage of forest utilization based on multi-resources and multi-function towarding sustainable management. After 1980s, forest resources have begun to be restored and have a good tendency, but the quality of forest resources in 2003 has not reached the level of 1962. So, the important and heavy task is still there to improve forest cultivation and management in order to meet the economic society’s need.