川西云杉硬枝扦插生根特性的研究

采用全光照自动间歇喷雾扦插繁殖方法对影响川西云杉Picea balfouriana插穗生根的内在因素进行了较为系统的研究,分别就川西云杉植物生长调节物质处理、插穗类型、插穗长度、采穗母树坡位、采条方向、插穗切口处理方式和环割等对插穗生根的影响进行研究。结果表明:200 mg.kg-1ABT 1号生根粉处理插穗基部3 h,500 mg.kg-1ABT 1号生根粉处理1h和1 000 mg.kg-1IBA速蘸处理,促进川西云杉硬枝插稳生根的效果较佳,生根率分别达到81.0%,76.2%和78.6%。不带上1年生枝条的生根率显著大于带上1年生枝条的,分别为56.4%,16.7%和14.3%。平均生根数和生根率在3种插穗长度间存在显著差异,12~20 cm插穗长度生根率分别比大于20 cm和小于12 cm的,高出83.2%。阴坡的生根率比阳坡高23.8%。2个采穗方向在平均生根数、平均根长和生根率之间差异不显著。4种插穗切口处理方式间差异不显著。环割处理的插穗生根率显著低于不环割处理的生根率。表3参18     

丽江云杉天然种群针叶功能性状及其随海拔的变异

This research investigated and selected 4 natural populations of Picea likiangensis in Yunnan province, based on its natural distribution. The length, width, dry weight and C, N, P contents in needles of the 4 populations were measured to survey the phenotypic variation of natural populations and the relationship between the phenotypic variation and their altitude of distribution areas. The methods of ANOVA analysis, multi-comparison and correlation analysis were used for analyzing the data measured. The results showed that, there were remarkable (P<0.01) variations in needle length, width and dry weight among populations, with component of variance 15.05%-28.03%, but no variation of them within populations. The dry weight was significantly (P<0.01) positively correlated to the needle length and width, and their correlation coefficients were 0.466 39 and 0.665 67, respectively. Regarding to element content in needles, there were significant (P<0.05) variations of N and P contents, and C/N ratio among populations, excepting C content. Moreover, the component of variance among populations was higher (29.98%-37.56%) when compared with that within populations, and there was distinctly (P<0.01) variance of N/P ratio among populations, and its component of variance was 60.44%. For correlations between needle length and N/P ratio, altitude was negatively and significantly (P<0.01) correlated; for needle width, altitude was significant (P<0.01) positive correlated, for C content and C/N ratio, altitude was significantly (P<0.05) positively correlated.