The selection of Paulownia fortunei, Ulmus Pumila, Broussonetia papyrifera and Cynodon dacytlon in that serious pollution district was the effective restorative method.

因而在Cd、Pb和Zn嚴(yán)重污染的環(huán)境中美国欧洲黄色电影网站网址导航，選擇泡桐无码毛片一区,二区,…、白榆国内精品久久久麻豆精品、構(gòu)樹和狗牙根的喬木和草本植物組合是該類污染區(qū)植物修復(fù)的有效途徑。

A dicot family of the order Urticales including: genera Ulmus; Celtis; Planera; Trema.

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Populus alba × berolinensis, Salix babylonica and Quercus mongolica mainly emitted isoprene; Pinus tabulaeformis mainly emitted α-pinene; Ulmus pumila, Gleditsia japonica and Syringa oblate mainly emitted limonene; Ligustrum obtusifolium mainly emitted isoprene, limonene and α-pinene at different time. The highest emission rates were observed for Populus alba × berolinensis and Salix babylonica.

不同樹種排放的BVOCs組成明顯不同，銀中楊免费视频插到爽、垂柳和蒙古櫟以排放異戊二烯為主；油松主要釋放α－蒎烯久久久特黄大片；榆樹一级黄色片干女儿久久网站、皂角和丁香以釋放檸檬烯為主；水臘在不同時(shí)段其BVOCs組成情況變化較大国产操逼视频免费观看，主要釋放異戊二烯国产黄色精品视频免费看、檸檬烯和α－蒎烯；其中銀中楊和垂柳的BVOCs釋放量明顯高于其它樹種欧美日韩有码A。

The BVOCs flux from Populus alba × berolinensis, Salix babylonica, Ulmus pumila, Gleditsia japonica, Syringa oblate and Ligustrum obtusifolium in Shenyang were 104.86tC·y-1, 168.66tC·y-1, 3.56tC·y-1, 1.27tC·y-1, 4.07tC·y-1 and 1.33tC·y-1, respectively.

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SPSS cluster analysis and CANOCO ordination method were applied to discuss the relationship between vegetation and its environmental factors in the west slope of Helan Mountain. The results show that the vegetation community can be divided into three types, namely Salsola passerina-Reaumuria soongorica community, Stipa breviflora-Stipa grandis community and Prunus mongolica-Ulmus glaucescens community.

通過(guò)SPSS聚類分析和CANOCO排序研究了賀蘭山西坡植被分布與環(huán)境因子的關(guān)系，結(jié)果表明：在海拔梯度上国产一区二区三区91免费播放，賀蘭山西坡植被大致可以劃分珍珠豬毛菜－紅砂群落国产操网、短花針茅－大針茅群落和蒙古扁桃－灰榆群落3種類型。

In order to better understand the determinants of tree height limit,32 tall tree species such as Parashorea chinensis,Sapium baccatum,Garcinia cowa,Eucalyptus citriodora,E.grandis×E.urophylla,Albizia falcataria,Populus tomentosa,Platanus hispanica,Ginkgo biloba,Pinus tabulaeformis,Ulmus pumia,Salix gordeivii,and Elaeagnus angustifolia from typical environments such as Xishuangbanna rainforest,Guangzhou subtropical area,Zhengzhou,Beijing,Helanshan mountain and Maowusu sandland in China were studied.

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Any of various trees of the genus Ulmus: important timber or shade trees.

各種各樣榆屬樹的任意一種，成性交免费视频；是重要的板材或綠蔭樹人人干人伦人人干。

The application of the structure of leaf epidermis in the classiffication of Ulmus.

葉表皮結(jié)構(gòu)在榆屬分類中的應(yīng)用。

He application of the structure of leaf epidermis in the classiffication of Ulmus.

itle 葉表皮結(jié)構(gòu)在榆屬分類中的應(yīng)用欧美一级性爰。

The application of the structure of leaf epidermis in the classiffication of Ulmus.

標(biāo)題 葉表皮結(jié)構(gòu)在榆屬分類中的應(yīng)用性爱视频毛片。