西南桦组培苗培育的轻基质筛选

西南桦(Betula alnoides Buch.-Ham.ex D.Don)是我国热带、南亚热带地区的一个乡土珍贵用材树种,其适应性强、生长迅速、材质优良,深受林农、私营投资商、林业企事业单位的喜爱,已在该地区广为栽培1],近10余年来推广面积达8万hm2。由于采用实生苗造林出现林分参差不齐、林木分化

Light Media Selection for Growing Micro-propagated Seedlings of Betula alnoides

Light media selection trial was conducted for cultivating micro-propagated seedlings of Betula alnoides. It was indicated that the media, clones and their interactions had significant (P<0.05)or extremely significant (P<0.01) influences on survival rate and majority of growth traits of the seedlings, but the effects of differences of above-ground biomass and their interactions on ground diameter were not significant (P>0.05). The three light media were remarkably better than soil for the growth of B. alnoides seedlings. The flexibilities of five clones to these light media were also quite different, for example, the clone B5 adapted to all the media. As a whole, the medium with 25 percent of pine skin and 75 percent of carbonized sawdust was the best for cultivating micro-propagated seedlings of B. alnoides, and was recommended to be used in practice.