The effects of temperature on seed germination characteristics of Dalbergia tonkinensis collected from Lang son of Vietnam were studied. Significant differences were found among treatments in terms of germination percentage, germination energy, germination index and average germination time. In range of 15 ℃ to 30 ℃, the germination rate, germination energy and germination index increased with the increasing temperature, while the average germination time decreased correspondingly. And all germination parameters achieved the highest or the lowest values under the germination temperature of 30℃ with mean germination percentage, germination energy, germination index and germination time being 84.70%±8.4%, 65.56%±6.9%, 42.39±5.0 and 6.3±0.0 days, respectively. While under 35℃, the seed germination was inhibited slightly, most germination parameters were significantly lower than those in 30℃ except the average germination time. It could be concluded that 30℃ was the optimum temperature for seed germination of D. tonkinensis.

The effects of pot host (Kuhnia rosmarinifolia) configuration on the growth of Indian sandalwood (Santalum album L.) seedlings were studied by container culture experiment using split plot design. ANOVA results showed that the configuration time of pot host affected the height (pp=0.038), biomass (p=0.039) as well as haustoria amount (p=0.016) of S. album seedlings significantly after 5 months’ growth, while statistically differences were not found for the quality index (p=0.120). The amount of K. rosmarinifolia as well as the interaction between amount and configuration time did not show significant differences on the above indices. Earlier configuration of the pot host was good for the growth of S. album, and it was the best when disposing the pot host in the same time with the transplantation of S. album seedlings from seed bed to containers. In consideration of nursery practices, the ideal pot host amount was 2 or 3, under such a configuration model, the growth of S. album seedlings achieved the best performance for most indices, including an average height of 29.43 cm, an average ground diameter of 0.41cm, an average biomass of 3.06 g, an average haustoria number of 151, and an average quality index of 0.402 after 5 months growth.

目的 开展降香黄檀扦插繁殖试验，探究不同浓度IAA和NAA对降香黄檀根系和新梢发育的影响，为降香黄檀优良单株材料的快速繁育和栽培提供理论和技术支撑。 方法 以2年生降香黄檀实生苗为采穗母株，依据IAA浓度、NAA浓度及浸泡时间设计正交试验；调查扦插80 d后不同处理间的生根率、根系发育和新梢发育指标，并运用隶属函数值法和主成分分析法对其繁殖效果进行综合评价。 结果 IAA浓度、NAA浓度、浸泡时间、IAA浓度与NAA浓度的交互效应以及IAA浓度与浸泡时间的交互效应对生根率的影响均差异极显著（P < 0.01），对总根长、生根数、根系表面积和体积的影响差异显著（P < 0.05）或极显著（P < 0.01）。在一定范围内，插穗生根率随IAA浓度的升高逐渐增加，随NAA浓度的升高逐渐降低。采用主成分和隶属函数值综合评价扦插繁殖效果，16个处理中扦插繁殖效果最好的前25%的处理依次为：处理12、16、5、11，生根率分别为96.10%、97.66%、96.10%、96.88%。 结论 综合考虑生根率和插穗生长发育状况，建议在生产实践中采用500 mg·L⁻¹ IAA+750 mg·L⁻¹ NAA +浸泡1 min、750 mg·L⁻¹ IAA+750 mg·L⁻¹ NAA+浸泡10 s、250 mg·L⁻¹ IAA+浸泡1 min和500 mg·L⁻¹ IAA+500 mg·L⁻¹ NAA+浸泡10 s的处理组合开展扦插繁殖。

目的 为了解不同浓度乙烯利对降香黄檀心材形成和精油成分的影响。 方法 以胸径6~8 cm降香黄檀为研究对象，采用树干注射的方法，研究不同乙烯利浓度（CK、0.1%、0.5%、2.5%）对降香黄檀淀粉和可溶性糖、基本材性、组织化学、精油成分的影响。 结果 表明：不同浓度乙烯利处理边材和变色边材的可溶性糖含量差异明显，变色边材的含糖量均明显低于边材；各处理边材的淀粉含量均显著高于CK，0.5%处理的变色边材中的淀粉含量最高，且显著高于其他处理。0.5%处理的生材密度最大，为1.036 g·cm^-3；绝对含水率、相对含水均为2.5%处理的最高；不同浓度乙烯利处理显著提高了变色边材的百分比和变色边材形成率。组织化学结果显示，各处理边材中均含有大量淀粉，变色边材中基本没有；变色边材中观测到大量脂类、酸性脂类和酚醛类物质，而未在边材中出现。变色边材出油率随乙烯利浓度的增加逐渐升高，0.1%、0.5%、2.5%分别比CK增加了52.28%、121.54%、128.54%。在检测到的12种共有心材成分中最主要的为橙花叔醇，各处理的橙花叔醇含量顺序为：CK > 0.1% > 2.5% > 0.5%；甜没药萜醇A含量最高的为2.5%，比CK升高了36.59%；α-金合欢烯和紫檀素均为0.1%处理的含量最高。 结论 综合分析各乙烯利处理对降香黄檀可溶性糖、基本材性、组织化学、精油成分和含量的影响，2.5%处理更有利于促进降香黄檀心材的形成。