杂种二代落叶松增产能力的研究

STUDY ON THE INCREASE PRODUCTION ABILITY OF THE HYBRID THE SECOND FILIAL GENERATION FOR LARCH

利用杂种一代自由授粉的种子造林，所产生的杂种二代具有明显的增产能力。７年生的落叶松高生长比对照平均增加３９．６％，其保存率也普遍高于对照。杂种二代与杂种一代一样具有较强的抗寒能力和适应性。充分利用杂种一代，可节省大量的人力、物力，促进营林生产的发展。

The afforestation with larch seeds of the hybrid generation by free pollination,hybrid second generation have evidently increase production ability.Height growth on the 7 years old larch average increses 39.6 per cent as compared with contrast,the preservation rate is all higher as compared with contrast too.Hybrid second generation is as frost resistant and adaptability as crossbreed first filial generation larch.If we full utilize the hybrid first generation,it would be use manpower and material resources sparingly largely,and be advantageous to develop of the forestry production.