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榆树是很常见的树种,由于其遮阴且美观的特点,很适合种在庭院里或作为景观树种在街道两旁。榆树的品种多达30种,世界各地都有分布。大多数榆树都有一些共同特点,它们都有绿色的锯齿般的叶子,秋天叶子会变黄,树皮粗糙且呈灰褐色,树形像花瓶的形状,这些特点使得榆树很好辨认。不幸的是,荷兰榆树病会威胁很多较大树龄的榆树,不过这种病也会让榆树更容易辨认。
步骤
- 从榆树的地理分布情况来判断。不同品种的榆树分布在不同的地方,比如,美国榆树主要出现在美国东部落基山脉向东的地区。[13] 在落基山脉以西就很少能看到美国榆树了,然而,在加利福尼亚又会经常看到它们。
- 西伯利亚榆树也叫亚洲榆树,花皮树,或者中国榆树,这种榆树主要分布在中亚、中国、蒙古,西伯利亚,印度和韩国。
- 欧洲榆树常见于欧洲,在荷兰榆树病出现之前,英国榆树在欧洲也很常见,但现在主要分布在葡萄牙、法国、西班牙和英国。
- 如果你种的树跟某个地区很多榆树的特征相似,那么你种的很有可能是榆树,所以,你可以直接从地理位置来判断榆树。
- 榆树耐旱,耐寒,耐瘠薄,耐中度盐碱,具抗污染性,不择土壤,适应能力很强。[14] 然而,它们更喜欢生活在阳光充足,排水良好,湿润的土壤中。
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小提示
- 你可以下载一个手机应用,会向你提供许多关于榆树的数据,你可以根据里面的内容来识别榆树。
- 榆树很容易生病,包括荷兰榆树病,这是一种由害虫传播的真菌感染疾病。如果榆树上有枯萎的嫩枝和嫩叶,有大片的死叶,或者叶子在不该变黄的季节变黄了,那么榆树应该是生病了。
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参考
- ↑ http://www.openelm.org.im/identifying-elms/
- ↑ https://www.extension.iastate.edu/forestry/publications/PDF_files/PM1384.pdf
- ↑ http://elmcare.com/about_elms/identifying/identifying_leaves.htm
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA135#v=onepage&q&f=false
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA134#v=onepage&q&f=false
- ↑ http://www.openelm.org.im/identifying-elms/
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA134#v=onepage&q&f=false
- ↑ http://elmcare.com/about_elms/identifying/identifying_silhouette.htm
- ↑ http://www.mortonarb.org/trees-plants/tree-plant-descriptions/elm-cultivars
- ↑ http://www.oplin.org/tree/fact%20pages/elm_american/elm_american.html
- ↑ https://books.google.com/books?id=5b68DsGlvVIC&lpg=PA188&pg=PA188#v=onepage&q&f=false
- ↑ http://natureinstitute.org/pub/ic/ic14/trees.htm
- ↑ https://www.arborday.org/programs/nationaltree/elm.cfm
- ↑ http://www.ext.colostate.edu/ptlk/1746.html
- ↑ http://www.fcps.edu/islandcreekes/ecology/american_elm.htm
- ↑ http://www.oplin.org/tree/fact%20pages/elm_american/elm_american.html
- ↑ http://www.oplin.org/tree/fact%20pages/elm_slippery/elm_slippery.html
- ↑ http://elmcare.com/about_elms/identifying/identifying_silhouette.htm
- ↑ http://www.openelm.org.im/identifying-elms/
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA134#v=onepage&q&f=false
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA136#v=onepage&q&f=false
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA139#v=onepage&q&f=false
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA135#v=onepage&q&f=false
- ↑ https://extension.usu.edu/weedguides/files/uploads/Ulmaceae.pdf
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA134#v=onepage&q&f=false
- ↑ https://books.google.com/books?id=tYV91AIRPmQC&lpg=PA344&pg=PA139#v=onepage&q&f=false
- ↑ http://www.mortonarb.org/trees-plants/tree-plant-descriptions/elm-cultivars
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