矮牵牛茎段植株再生体系的建立

将矮牵牛Petunia hybrida Vilm的茎段接种在MS附加不同激素的培养基上进行愈伤组织诱导.结果表明:在MS BA1.0 mol.L-1 NAA1.0 mol.L-1的培养基上可以形成愈伤组织,而且经过继代培养仍可形成愈伤组织;茎段或愈伤组织接种在MS BA1.0 mol.L-1 NAA0.1 mol.L-1的培养基上可以形成不定芽,且诱导率达100%;健壮的高1.5~2.0 cm的不定芽接种在1/2MS IBA0.5 mol.L-1 AC1.0 g.L-1的培养基上,其生长根状况良好,生根率达100%.     

广州火车东站南广场绿地的有机更新实践

对城市已建绿地进行升级改造是城市更新的重要内容。广州火车东站南广场是城市新中轴线上的重要节点,为迎接第16届亚运盛会进行了绿地有机更新,取得了较好的效果。文章以此为例,分析探讨该项目的得与失,并总结阐述了绿地有机更新的一些理念、策略与特点,以期为未来城市绿地的升级改造实践提供有益参考。     

群众杨组培体系的研究

以群众杨(Populus popularis 35-44)为材料建立组织培养再生系统。研究表明，外植体取材部位对不定芽的分化率有非常明显的影响，叶片的再生能力较弱，而幼茎的再生能力很强，叶柄的再生能力介于叶片及幼茎之间。因此，无菌苗幼茎是快繁和基因转化的理想外植体。在组培体系建立过程中发现再生不定芽中存在生长优于对照的个体，是否为体细胞无性系变异有待进一步研究。     

Brazilian savanna re-establishment in a monoculture forest:diversity and environmental relations of native regenerating understory in Pinus caribaea Morelet. stands

In this paper we analyze and compare natural regeneration in shrub-tree community in three areas below Pinus caribaea stands and a natural area (cerrado sensu stricto). We also analyze the influence of...     

农田木麻黄防护林网更新技术研究

通过沿海沙地农田防护林网中的木麻黄更新试验,结果认为:福建沿海农田木麻黄防护林更新迹地的沙壤都比较贫瘠且普遍存在P元素的缺乏;补充元素技术可有效地促进更新林带的生长;木麻黄优良无性系的利用能提高更新林带的保存率和生长量;农田木麻黄防护林带更新配套技术的实施可取得良好的更新效果,防护效能也得到了很大的提高。     

雷公山姊妹岩大果马蹄荷群落初步研究

大果马蹄荷群落是雷公山森林生态系统中的一个类型，通过调查，对大果马蹄荷群落结构、群落特征、天然更新进行初步研究。     

A comparative assessment on regeneration status of indigenous woody plants in Eucalyptus grandis plantation and adjacent natural forest

Diversity, density and species composition of naturally regenerated woody plants under Eucalyptus grandis plantation and the adjacent natural forest were investigated and compared. Twenty plots, with an area of 20 m × 20 m for each, were established in both of E. grandis plantation and adjacent natural forest, independently. In each plot, species name, abundance, diameter and height were recorded. Numbers of seedling were collected in five sub-plots (4 m²) within each major plot. A total of 46 species in the plantation, and 52 species in the natural forest, which belongs to 36 families were recorded. The diversity of species (H′) is 2.19 in the plantation and 2.74 in the natural forest. The density of understory woody plant was 3842 stems/ha in the plantation and 4122 stems/ha in the natural forest. The densities of seedlings in the natural forest and the plantation were 8101 stems/ha and 4151 stems/ha, respectively. High similarity of woody species composition was found between the natural forest and the plantation. The E. grandis plantation was found favoring the regeneration and growth of Millitia ferruginia and Coffea arabica in a much better way than other underneath woody species.     

Disturbance history and dynamics of an old-growth mixed species mountain forest in the Slovenian Alps

A long history of human presence in the Alps has made studies of natural forest structure, composition, and disturbance processes difficult. In the Slovenian Alps, we identified a mixed European beech (Fagus sylvatica L.)-silver fir (Abies alba Mill.)-Norway spruce (Picea abies (L.) Karst.) stand with old-growth characteristics that escaped past cutting. We reconstructed the dynamics of the stand using a combination of stand and age structure analyses, dendroecological evidence of past canopy disturbance, and historical evidence of past human activities. The disturbance reconstruction revealed a stand-scale disturbance in the 1850s. Based on the presence of pit-and-mound topography throughout much of the stand and the absence of logging activities found in historical records, we assume this event was caused by strong winds. The current structure and composition of the stand are largely a result of this event. Post-disturbance forest development was dominated by the release of shade tolerant regeneration, especially F. sylvatica. The windthrow also created appropriate conditions (i.e. increased light and exposed mineral soil) for recruitment of less shade tolerant species, including larch (Larix decidua Mill.) and maple (Acer pseudoplatanus L.). The results suggest that periodic, intermediate severity wind disturbances, similar to the event documented here, may have had an important influence on pre-settlement forest dynamics in mixed mountain forests of the Alps, and add to the limited available information regarding the historic range of natural variability of disturbance processes. This information may be useful for forest management that attempts to emulate natural processes.     

金丝慈竹愈伤组织培养及植株再生研究

通过正交试验筛选出金丝慈竹愈伤诱导的最佳配方MS 2,4-D 5 mg/L 6-BA (0.2～0.5)mg/L;记录了愈伤发生过程中不同类型愈伤的发生时间及生长状态,并通过对健康的I型愈伤组织进行增殖培养筛选出最佳增殖配方MS 2,4-D(2～3 mg/L)46-BA 0.2 mg/L NAA 0.5 mg/L.通过对增殖后健康的I型愈伤组织的诱导分化,实现了器官再生,并获得最佳芽体分化配方MS 6-BA 5 mg/L NAA 0.2 mg/L及不定根系发生诱导配方MS 6-BA 1 mg/L NAA(0.5～2mg/L).