柳树是在盐碱地上重要的造林树种.盐胁迫对植物的影响是多方面的,主要表现在个体形态发育和生理生化诸方面,植物应对盐胁迫的方式也是极其复杂的.本文从柳树的耐盐机理、耐盐性以及良种选育方面进行了综述,分析了柳树的耐盐程度、耐盐机理、耐盐良种选择等问题,以期对今后柳树的研究及选育提供理论依据.

Observation and experiments were performed on blossom phenophase, flower organ morphology, maturing rate of artificial cross-pollination, natural pollination, self-fertilization and parthenogenesis, ovary ovule number and empty embryo rate etc. to accurately grasp the biological characteristics of flowering, fructi-fication and sexual reproduction of Robinia pseudoacacia and R. neo-mexicana var. luxurians, which can lay a foundation for cross breeding. The results were as follows. The blossom phenophase of the two plants was from the end of April to early May in the middle and the southern region of Shandong Province. Early flowering sea-son of R. pseudoacacia lasted only 1 d, full-bloom stage sustained 2 d, and at the end of the flowering continued 2–3 d, while early flowering season of R. neo-mexicana var. luxurians lasted 2 d, full-bloom stage sustained 3 d, and at the end of the flowering was 4 d. The two species were dichogamous. The natural pollination rate of R. pseudoacacia was significantly different between individuals with the average maturing rate was 26.02%, whereas the natural pollination seed setting rate of R. neo-mexicana var. luxurians was extremely low with an average of only 0.11%, therefore it is only suitable for male parent. The manual cross-pollination seed setting rate of R. pseudoacacia intraspecific clones and interspecific acacias was only 1.7% and 0.21%, respectively. The maturing rate of self-fertilization and parthenogenesis in R. pseudoacacia are 1.8% and 0. There were 18 and 22 ovules on average in each pod of R. pseudoacacia and R. neo-mexicana var. luxurians, respectively. Empty embryo rate of each pod in R. pseudoacacia is very high, with an average of 53.94%, while the empty embryo rate of each pod in R. neo-mexicana var. luxurians is extremely high, with an average of 87.61%; The seeds of R. pseudoacacia and R. neo-mexicana var. luxurians needed 80–90 d and 70–80 d from fertilization of the ovule to maturation, respectively.

以3个刺槐无性系1年生苗为研究对象,通过比较晴天下光合日变化和生物量分配,研究了无性系的生态适应性.结果表明:L1和L59净光合速率日变化为双峰形,峰值分别在10:00和16:00;而L78为单峰形,峰值在10:00.净光合速率日均值L1＜ L59＜L78;蒸腾速率日均值L1和k与L59差异不显著,叶温日均值低于L59;但在气孔导度和水分利用效率日均值上无性系之间显著不差异.3个无性系在叶生物量比、茎生物量比上差异不显著,根生物量比是L1和L59高于L78.综合比较3个无性系,L59高的光合能力和根系生物量分配使其在生态系统早期演替阶段有着最强的适应能力.

我国古典园林一直注重诗情画意的体现,园林意境的深远体现园主人的意志,意境是整个园林的精髓所在.随着时代的发展,园林的服务对象不同,功能也发生改变.当代景观设计存在空洞、夸张、意境缺失等问题.如何将古典园林的精华应用于现代景观设计是今人值得深思的.探讨了古今园林的异同,提出继承发展古典园林中意境的必要性,结合现存景观工程,讨论当代景观设计园林意境体现的具体手法.

党的十七大报告提出的"加强和改进思想政治工作,注重人文关怀和心理疏导"新论断,无疑为思想政治工作指出了新的工作方向。心理疏导引入企业思想政治工作,有利于企业稳定和凝聚人心,有利于促进职工的心理健康。在思想政治工作中注重心理疏导,把思想政治工作渗透到企业改革与发展的全过程,是企业及各级领导干部必须认真学习、思考、实践的重要课题。