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Chemical constituents of root barks of Ulmus pumila(Ⅱ);

榆树根皮的化学成分(Ⅱ)

Objective To isolate and identify the chemical constituents from the 80% ethanol extract of the root bark of Ulmus pumila.

目的研究榆科植物榆树 (UlmuspumilaL )根皮中的化学成分。

Ulmus pumila Linn, is one of important landscape trees in Harbin.

榆树(Ulmus pumila Linn。

China is one of the countries with the most species and the largest distribution area of elm.

该文对榆属树种的遗传育种研究进展进行了较为系统的综述 ,主要包括 :国内外榆树育种材料资源的保存和利用现状 ;国内外榆树改良和育种目标 ;选择、杂交及其它非常规育种手段在榆树改良项目中的应用 。

Hg(mercury)concentration of black soil in Yushu city of Jilin Province was investigated,and influencing factors were analyzed.

调查了吉林省榆树市黑土的汞含量状况,并分析了土壤及粮食作物的汞含量的影响因素。

Ulmus pumila open forest ecosystem plays an important role in Otindag Sandy Land.

榆树疏林生态系统是浑善达克沙地的重要组分之一 。

Ulmus pumila open forests have extensive distribution in the Otindag Sandy Land, which are important for lightening sandstorm.

榆树是浑善达克沙地的优势种,榆树疏林在浑善达克沙地成缀块状分布,对于该区域生态系统的整体性和多样性维持以及防风固沙等方面具有重要意义。