不同栽培措施下火炬松穗条产量的变化

以1年生火炬松Pinus taeda实生苗为材料，进行3因素(截干高度、施肥配方、种植密度)3水平L9(34)正交试验，分析不同栽培措施对穗条产量的影响。结果表明，春季促进穗条产量增加的优化组合为截干高度15 cm，施用农家肥，种植行间距50 cm×80 cm；夏季优化组合为施用农家肥+复合肥，截干高度15 cm，种植行间距为50 cm×80 cm；秋季优化组合为施用农家肥+复合肥，种植行间距50 cm×80 cm，截干高度为12 cm；冬季优化组合为施用农家肥，截干高度15 cm，种植行间距40 cm×50 cm；提高单株穗条年产量的优化组合为施用农家肥+复合肥，截干高度15 cm，种植行间距40 cm×50 cm。因此，在火炬松生长不同时期，选用不同的栽培措施有助于提高穗条产量。

Comparison of Cutting Yield of Pinus taeda under Different Managements

In order to build a high-yield cutting nursery of Pinus taeda, the 3-level L9 (34) orthogonal test was conducted. The results showed that the optimum combination of cutting yield in spring was 15 cm truncation height, row spacing of 50 cm × 80 cm; in summer, the optimized combination was farmyard manure + compound fertilizer, 15 cm truncation height, row spacing of 50 cm × 80 cm; in autumn, the optimized combination was farmyard manure + compound fertilizer, row spacing of 50 cm × 80 cm, and 12 cm truncation height; in winter, the optimum combination was farmyard manure, 15 cm truncation height, and row spacing of 40 cm × 50 cm. Improved combination of annual cutting yield was farmyard manure + compound fertilizer, 15 cm truncation height, and row spacing of 40 cm × 50 cm. Therefore, there should be used different management measures in different periods for increasing cutting yield of Pinus taeda.