The dominant species at arbor layer are Washiongtonia robusta, Ficus microcarpa, Roystonea regia, Delonix regia, Caryota ochlandra, Alstonia scholaris, Bauhinia variegate, Bombax malabaricum, Erythrina orientalis, Cinnamomum japonicum, Acacia onfuse. The dominant species of shrub layer mainly are Rhododendron simsii, Osmanthus fragrans, Hibiscus rosa sinensis.

植物群落中喬木優(yōu)勢種的組成主要有：華盛頓棕櫚a视频免费在线观看、榕樹最新无码不卡手机在线视频播放网站、大王椰子、鳳凰木www欧美A片、魚尾葵一级古装A片、盆架子、洋紫荊亚洲自拍色图、木棉欧美精品免费a、刺桐、天竺桂国产色无码专区视频、臺灣相思等全黄视频A片；灌木優(yōu)勢種主要有：杜鵑、桂花亚洲欧美高清在线精品四区、扶桑欧美色色色色色图。

The results were as follows: 1 There were 7 133 trees, belonging to 23 species and 18 genera and 13 families, and their average DBH, crown and height were respectively 27.59 cm, 4.10 m and 6.94 m. In general their average crown was relative small. 2 S, H (Shannon-Wiener index), and D of biodiversity index were small, and there were the obvious difference in those indexes among different streets, which suggested that there were certain monotone of the tree species and structure layer. 3 The dominant species mainly consisted of evergreen trees that were Ficus virens var. sublanveolata, Ficus benjamina, Roystonea regia, Terminalia hainanensis, T.

結(jié)果表明：1梅州城區(qū)行道樹共有13科18屬23種7133株，其平均胸徑黄色网站一级二级区、平均冠幅欧美一级黄色A片视频、平均樹高分別為27.59cm，4.10m精品91在线，6.94m亚洲久久青草鸭，總體上看，平均冠幅偏?1av福利在线观看ww.756av；2物種豐富度指數(shù)S、Shannon-Wiener指數(shù)H和Simpson指數(shù)D偏小且各道路間差異明顯成人毛片视频免费无卡播放，說明各道路行道樹存在一定程度的物種單一性日韩精品视频推荐视频一二三四、層次的單調(diào)性；3梅州市城區(qū)行道樹優(yōu)勢樹種是大葉榕、垂榕亚洲国产图片大全视频、大王椰子日韩一级免费黄片，次優(yōu)勢種為海南欖仁、阿珍欖仁久久久久久九综合久日本精品、陰香chengren视频在线观看，它們是梅州城市街道綠化的好樹種。