本文综述了长白山区11种桔梗科野生植物果实及种子特点,测定了种子千粒重、容重,简述种子萌发温度.

依据吉林省前郭县地区复杂的立地类型及气候条件，提出了针对不同立地条件的造林技术，并对三北防护林体系建设工程困难立地造林项目效益做了初步分析。

More and more attentions are paid to Acer resources for their characteristics as ornamental trees,lumber trees,medicinal plants.In order to explore such a precious resource of Acer to China,the research advances of Acer were summarized,including the aspects of resource investigation,propagation technology,genetic basis,introduction and domestication.Economic values of Acer were concluded as ornamental trees,lumber trees,medicinal plants.In future,people paid attention to collect and protect the gene resources,introduction and domestication,integrative research and development utilization,and in order to realize rational utilization and detailed research of plant resources.

本文论述了生态环境建设与跨越式发展的关系,总结了中国东北地区城乡生态环境建设的现状及存在的主要问题,提出了搞好生态环境建设的对策.