Ulmus

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.

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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。

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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.

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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）。

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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。

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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.

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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。

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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；

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