Changing Regular ities and Structura l Character istics of the Bioma ss andProductivity of Aerially Seeded Pinus m asson iana Planta tion

Through classifying and combining of site condition, forest age and density, the single-tree biomass, forestbiomass, structural characteristics and p roductivity of aerially seeded Pinus m asson iana p lantations in Hu’nan p rovince were studied based on 176 standard p lots’data. The results are as follows. The biggest biomass values of single-tree or standswere 181. 12 kg and 84. 49 t·hm-2 respectively, and the smallest oneswere 15. 73 kg and 8. 85 t·hm-2 , and the biggestwere 11. 5 times and 9. 5 times asmuch as that of the lowest, so it could be seen that thebiomass of single-tree had a more wide changing extent than stands’. For every combination type, the biomass ofsingle-tree or stands all showed the regularity of trunk > root > branch > bark > leaf. In different site indexes andstand densities, the net p roductivity had extraordinary difference for different ages so that the biggestwas 19. 4 timesasmuch as that of the lowest, exceeding 5. 52 t·hm-2 ·a-1. These results could offer some scientific basis forcomp rehensively supervising and managing of aerially seeded Pinus m assoniana p lantations.