The biomass of Castanopsis fissa plantation

The increment,biomass and productivity of Castanopsis fissa plantation in Niumulin Nature Reserve of Fujian Province were studied using method on stem analysis. The results showed that: the height,diameter at 1. 3 m( DDBH) and timber volume of Castanopsis fissa reached 16. 5 m,19. 5 cm and 0. 27 m3. There was 3 pinnacle in height growth,5 pinnacle in DDBHgrowth and 2 pinnacle in timber volume growth. The high growth rate of DDBHwas consistent with the year of height growth while timber volume was relatively backward. The annual growth curve of height intersected with the average growth curve multiple times and changed drastically. While the various growth curve of timber volume nearly disjoint and little changed. Simulating total increment of height,DDBHand timber volume of C. fissa with tree age by regression equation showed ideal fitting effect. The biomass order of C. fissa organs was stem branch root leaf,and the distribution of moisture was root stem branch leaf,the average moisture content of single plant was 48. 05%. The total biomass of22-year-old C. fissa population was 295 261 kg / hm2,and its net productivity was 13 420. 95 kg/( hm2·a).