I-69杨胶合板用材林产量及生物量结构

采用 2 90块标准地调查资料 ,分析了 I- 6 9杨胶合板用材林的产量和生物量结构随立地指数和造林密度的变化规律。胶合板材产量随立地指数的增大而增大 ,且占总产量的百分比在立地指数为 14、16、18m时 ,随造林密度的增大而减小 ;当立地指数为 2 0 m和 2 2 m时 ,保持稳定在 50 %左右。磨木浆材和化学浆材产量随立地指数和密度的增大而增加。在立地指数为 14、16、18m时磨木浆材产量占总蓄积量的百分比和化学浆材产量占总蓄积的百分比均随造林密度的增大而增大 ;在立地指数为 2 0、2 2 m时则受造林密度的影响不大 ,分别保持在 30 %和 2 0 %左右。林分和单株的树干、树枝、树皮生物量组成比例均随立地指数、造林密度的变化无明显的差异。营造 I- 6 9杨胶合板用材林时选择立地指数 2 0、2 2 m的地段以及用造林密度 156 (8m× 8m)、2 0 4 (7m× 7m )株·hm-2 为最佳。

The Yield and Biomass Structure of Plywood Forest of Poplar Clone I-69

Based on the survey data of 290 valuation areas, analyzed laws of yield and biomass structure with the change of site index and planting density. The results show that yield of plywood timber increases with increase of site index. The percentage of plywood timber to total yield decreases with increase of planting density in the site indices 14,16 and 18 m; But in the site indices 20 and 22 m, the percentage is basically steady of 50 percentage or so. Both yields of ground wood timber and chemical pulp timber increase with increase of site index and planting density. The percents of ground wood pulp timber yield to total yield and chemical pulp timber yield to total yield increase with increase of planting density in site indices 14,16 and 18 m; But in site indices 20 and 22 m, the percent is steady at 30 and 20 percent respectively. The ratios of stem, bark and branch biomass to total biomass of stand and individual tree are basically steady in different site index and planting density. It is most feasible to manage plywood forest for poplar clone I 69 with space 8 m ×8 m or 7 m × 7 m and site index 20 or 22 m.