稀土及多胺对欧石楠瓶苗生根的效应

本研究以欧石楠继代瓶苗为试材,在生根基质中添加不同浓度的Ce(NO3)3、La(NO3)3和多胺(Spd、Spm、Put),研究其对欧石楠瓶苗生根的影响。结果表明,在欧石楠生根培养基1/2WPM+IBA 0.5 mg/L+NAA 0.2 mg/L中加入0.5～5.0 mg/L Ce(NO3)3和La(NO3)3均可显著提高其生根率、促进根系的伸长生长,而其高浓度对欧石楠瓶苗生根有抑制效应。多胺中的亚精胺(Spd)对其生根具有明显的促进作用,而精胺(Spm)和腐胺(Put)对其生根影响不大。

The Importance of Spatiotemporal Heterogeneity for Biodiversity in Forest—Heathland Mosaics and Implications for Heathland Conservation

In biodiversity management, spatio-temporal heterogeneity is important to consider conserving high levels of habitat diversity and ecosystems. In this study, we investigated the relationship between landscape spatio-temporal heterogeneity and biodiversity in a mosaic-landscape, located in the Fontainebleau forest (France). The diversity of successional stages along a gradient from heathland to forest as well as the persistence of Calluna vulgaris (L.) Hull in different forest stands was examined in order to find how the numerous patches of European Heathland habitat embedded in this area should be maintained. The results indicated that in the areas of high spatio-temporal heterogeneity, a general increase is observed in species richness, in particular for vascular plants, bryophytes and carabids. C. vulgaris persisted in coniferous stands and young mixed stand but decreased under deciduous trees and old mixed stands. The Ellenberg’s values for light, nutrients and acidity, show the persistence of favorable enviromental conditions for heathland vegetation under coniferous stands and young mixed stands. These results enable us to offer recommendations to better manage mosaic-landscape biodiversity, and in particular, the heathland semi-natural habitats in the Fontainebleau forest and elsewhere in Europe.

帚石楠组培快繁研究

[目的]建立帚石楠组织培养快速繁殖技术。[方法]以帚石楠为研究对象,从不同消毒方式及时间、不同生长调节剂配比、不同暗处理时间等方面研究帚石楠的组培快繁体系。[结果]处理帚石楠幼嫩茎段时,以0.1%升汞处理12 min较为适宜;最适的分化培养基为MS+BA 0.5 mg/L+1.0 mg/L 2,4-D;最适生根培养基为MS+IBA 0.15 mg/L+NAA 0.25 mg/L;接种后将接种苗进行5 d暗处理可明显提高生根率。[结论]建立了帚石楠组织培养快速繁殖技术体系,为其规模化生产提供理论依据。