Dalbergia odorifera T. Chen is one of the two most precious tree species naturally distributed in China. The grafting techniques of D. odorifera were studied through comparing grafting methods, grafting seasons, rootstock grades as well as scion buds. The results showed that both "scarf joint grafting" and traditional cleft grafting were feasible for stem grafting. The two-bud "scarf joint grafting" got the best survival rate, while the cleft grafting was easy to operate. The best grafting seasons varied in the light of climate. In the warm southwest of Hainan island, the best grafting season was winter when the survival rate could achieve as high as 99.1%. While in Guangzhou, the best grafting season was the end of fall, and the corresponding survival rate was 94.6%. The quality of rootstock as well as scion bud affected the growth of scion bud directly. The growth of grade I buds/grade I rootstocks were 17 times that of grade III buds/grade III rootstocks. The study was beneficial for the preservation of high quality germplasm resources as well as for clone grafting of D. odorifera.

通过利用变权欧式距离模型对海南黎母山次生林、桉树人工林、橡胶人工林流域地表水2010年4月到2011年2月的水质监测数据进行综合评价,并与灰色关联分析、灰色聚类以及模糊综合评价的结果作比较,结果表明:3种森林流域地表水的变权欧式距离模型和灰色聚类评价结果均为Ⅰ级水体,基于灰色关联和模糊综合评价的次生林流域地表水的评价结果为Ⅰ级水体,而2010年6月桉树林流域地表水和2010年8月橡胶林流域地表水评价结果为Ⅱ级水体,其余月份均为Ⅰ级水体,这说明该地区人工林对流域水质没有产生负效应。

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。