氮素高效基因型杉木无性系的选择研究

为筛选适应退化地生长的杉木无性系 ,通过N素胁迫进行N素高效基因型杉木无性系的选择研究 ,结果表明 :不同杉木无性系的N素利用效率存在差异。随N素胁迫加剧 ,杉木无性系NR活力及光饱和点下降 ,CO2 补偿点增加 ,不同杉木无性系对N素胁迫的反应日趋明显 ,根据不同无性系在胁迫条件下的反应 ,把供试无性系分成 3类 :耐N肥性强、耐N肥性弱及耐N肥性一般无性系 ,其中 16 3号和 30 1号无性系是具有较高N素利用效率的省肥高产无性系 。

马尾松种子园无性系结实量、种实性状及遗传参数的分析

The cone and seed characters of Pinus Massoniana were investigated in a clonal seed orchard for two successive years(1998 and 1999).The results showed that significant genetic variation existed among clones,while variation within clone had not come up to remarkable standard.Broad sense herit ability of cone and seed characters in P.massoniana were influenced by genetic factors,most of them were at over middle level.There was a extremely significant difference in the correlation coefficients among the characters of cone and seeds,and the correlation coefficients of the same character in different years were at the extremely significant level,which indicated that the clones were quite stable from year to year in cone and seed quality and size.At last,the comprehensive evaluation was estimated in 140 clones by main index of reproductive capacity.The genetic gain of cone yield of a single tree,the seed numble of a single cone,and full seed percentage,and reselection of clones were discussed under different selection intensities.

提高杉木嫁接种子园产量中花粉管理的初步研究

杉木(Cunninghamia Lanceolata(Lamb) Hook)是我国南方主要速生用材树种。为加快良种建设步伐,60年代后期各地在选优建园基础上对先后营建的杉木嫁接种子园加强了科学经营管理,取得了一定的成效。实践证明,花粉管理好坏对于提高种子园的产量和质量是很重要的一环。现就花粉管理中的试验观察初报如下:

提高马尾松大面积荒山造林成效的初步调查研究

马尾松是一个造林季节性很强的树种。试验结果表明:穴壁一锄法造林效果最好;带菌根菌处理不但能显著提高其造林成活率(11.8～18.7％),而且能促进幼树的生长;马尾松在Ⅱ类地的立地条件下其生长效果不亚于Ⅰ类地。在选好种源的基础上,采用带菌根土、穴壁一锄法造林,是提高马尾松大面积荒山造林成效的一条重要途径。