Ulmus

Japanes elm sawfly is a kind of main phyllophagous insect to Ulmus L.

榆叶蜂是巴盟榆树的主要食叶害虫,发展速度快、食叶量大,危害严重.

Acer negundo, Salix matsudana, Juniperus rigida, Fraxinus mandshurica and Ulmus pumila are frontal 5 tree species with weight value 78.14, 76.92, 75.96, 74.72 and 74.56 respectively, were used for urban protection forest; Ulmus pumila, Salix matsudana, Populus alba × P.

糖槭、旱柳、杜松、水曲柳、榆树为符合城市防护林的前五位的树种，权重值分别为78.14、76.92、75.96、74.72、74.56；

A Preliminary Study on the Mathematic Model of Leaf Area of Ulmus pumila Linn.

与榆无性系叶面积数学模型初步研究>>相似的文献.

Q cluster showed that Ulmus varieties and half-sib families were in the same group. The results of cluster were similar to the traditional classification except siberian elm.

Q聚类结果表明榆属栽培变种和半同胞家系聚为一组；榆属种间大部分聚类结果和传统分类吻合但白榆分类和传统不符。

wind tunnel test indicated that the volatiles of ulmus pumila and ricinus communis have high efficiency to attract holotria diomphalia.

风洞生测表明，家榆和蓖麻的挥发物对东北大黑鳃金龟具有明显的引诱作用。

ivela ochropoda is one of the main defoliator pest occurred in ulmus pumila, and is very serious in wuqi county.

榆毒蛾是榆树的食叶害虫之一，在吴起县发生严重。

Overall, strong canopy morphological adaptability species ( 4-5 points) including: Pinus thunbergii, Quercus acutissima, Ulmus pumila, Salix babylonica, Sabina chinensis, Lagerstroemia indica, Broussonetia papyrifera, and so on.

整体来说树冠形态适应性较强（4-5分）的树种有：大乔木6种（黑松、麻栎、白榆、垂柳等）；小乔木5种（龙柏、紫薇、构树等）。

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.