共查询到20条相似文献，搜索用时 453 毫秒
1.
2.
3.
4.
行道树一般要求树龄长，树干通直，树姿端正，体形优美，冠大荫浓，花朵艳丽。芳香郁馥，春季发芽早，秋季落叶迟而整齐，叶色富于季相变化、抗逆性强的树种。而鹅掌楸是比较理想的观花、观叶、观形的珍贵树种，可作为行道树首选树种。 相似文献
5.
6.
7.
8.
9.
10.
红檵木是原产于湖南的观花赏叶树种。本文在进行了大量调查研究的基础上,对不同栽培方式下红檵木花叶病毒病的表现特征和发展规律进行了研究。 相似文献
11.
以齐齐哈尔市绿地分布的53种木本植物为研究对象,在对植物萌芽展叶物候与物候相进行基础调查的基础上,通过萌芽与展叶参数的相关性分析及物候相的聚类分析,揭示齐齐哈尔市园林绿化树种春季萌芽展叶物候特征与物候相规律。结果表明:萌芽期从3月下旬一直持续到5月上旬,高峰期集中在4月上中旬;展叶始期从4月中旬持续到5月中旬结束。萌芽期与展叶始期、展叶盛期、展叶末期存在极显著的正相关性。聚类簇群分析共划分为4种类型,处于相同物候相类型的植物萌芽与展叶持续时间物候呈现相对的同步性。齐齐哈尔园林绿化树种的春季物候与物候相特征的研究,可为北方寒地春季园林绿地空间植物景观的营造提供科学依据,也为构建多样性的植物群落提供参考。 相似文献
12.
针对乌鲁木齐市主要道路绿化现状,就植物种类、季相搭配、植物配置模式进行调查研究.结果表明:乌鲁木齐市道路绿地主要有绿化植物92种,其中乔木类49种、灌木类21种、花卉类22种,还有部分草本及藤本植物.调查发现,道路绿化以乔木为主,但美化树种不多,出现频度最高的10种乔木,没有1种既观花又观叶的种类;季相搭配做到了四季变化,但春、冬季景观薄弱;植物配置垂直结构共3种类型,其中具3~4层结构的占50%.提出:今后应增加季相、色相变化感强的观花或观果乔木树种,调整乔、灌树种比例,适当增加花灌木与宿根花卉的种类与数量,此外,不同道路植物种类的选择和配置首先应与道路的性质和功能紧密结合. 相似文献
13.
14.
15.
16.
通过对安康中心城市的区位分析,结合秦巴山区蕴藏的丰富景观植物资源及自然山地、水域资源等优势,提出了构建安康中心城市地域特色绿地景观的途径是:因地制宜,确立城市绿地景观形象的意境定位;合理规划绿地系统,形成"水在林中,城在林里"的景观格局;尽快确立市树、市花、市果;合理规划城市绿化树种,塑造过渡带特色绿地景观等途径,从而打造富有地域特色的城市绿地景观。 相似文献
17.
针对我国乡村地区花卉景观建设规划选址问题,根据花海、花田、花林、花谷和花岭的不同特点,结合地形地貌、人口数量、消费水平和景观可达性等影响因素,综合分析了乡村地区花卉景观建设的规划选址问题。初步提出这4种因素影响下的乡村花卉景观适宜建设的区域、数量和规模以及乡村地区不同类型花卉景观建设规划选址影响因素影响力的排序;其中,人工花卉景观选址影响因素的最优排序为景观可达性>人口数量>消费水平>地形地貌;半人工花卉景观选址影响因素的最优排序为地形地貌>景观可达性>人口数量>消费水平;且花卉景观建设数量和规模与当地人口数量、消费水平关系密切;为我国乡村地区花卉景观建设规划选址提供参考。 相似文献
18.
Interactions between two canopy layers in a designed perennial herbaceous plant community were investigated over a period of four and a half years to see whether it was possible to create an urban landscape vegetation that was both flower rich for an extensive time period and resistant to weed colonization at very low levels of maintenance by sowing seed in situ. The ecologically novel plant community involved a tall over-canopy layer of 18 species of North American prairie and woodland edge forbs, and a shade tolerant under-canopy of eight European and North American, mainly woodland forbs. After 5 years the community was dominated by four over-canopy and two winter green under-canopy species. Interspecific competition generated by the sown biomass restricted weed colonization to very low levels, despite the experiment being surrounded by a weedy brownfield. The winter green canopies of the two dominant under-storey forbs closed down gaps within a winter deciduous, prairie-like vegetation, improving winter appearance and providing a major flowering display in spring. This vegetation is an attractive design model for more sustainable herbaceous planting in urban landscape space. 相似文献
19.
Landscape change is an ongoing process for even the most established landscapes, especially in context to urban intensification and growth. As urbanization increases over the next century, supporting bird species’ populations within urbanizing areas remains an important conservation challenge. Fundamental elements of the biophysical structure of urban environments in which bird species likely respond include tree cover and human infrastructure. We broadly examine how tree cover and urban development structure bird species distributions along the urban-rural gradient across multiple spatial scales. We established a regional sampling design within the Oak Openings Region of northwestern, Ohio, USA, to survey bird species distributions across an extensive urbanization gradient. Through occupancy modeling, we obtained standardized effects of bird species response to local and landscape-scale predictors and found that landscape tree cover influenced the most species, followed by landscape impervious surface, local building density, and local tree cover. We found that responses varied according to habitat affiliation and migratory distance of individual bird species. Distributions of short-distance, edge habitat species located towards the rural end of the gradient were explained primarily by low levels of urbanization and potential vegetative and supplemental resources associated with these areas, while forest species distributions were primarily related to increasing landscape tree cover. Our findings accentuate the importance of scale relative to urbanization and help target where potential actions may arise to benefit bird diversity. Management will likely need to be implemented by municipal governments and agencies to promote tree cover at landscape scale, followed by residential land management education for private landowners. These approaches will be vital in sustaining biodiversity in urbanizing landscapes as urban growth expands over the next century. 相似文献
20.
In landscapes dominated by late-successional plant communities, early-successional species may lead a tenuous existence, persisting only as fugitives or relying on refuges in marginal habitats to provide a persistent seed source. The objective of this study was to relate fine-scale distributions of early-successional tree species in hemlock-hardwood forests of northern Wisconsin, USA to potential landscape persistence strategies. A special emphasis was placed on eastern white pine (Pinus strobus), a restoration priority in the region. Witness tree data from nineteenth century US Public Land Survey records (encompassing 40,610?km2 and 106,790 trees) were used with modern environmental data to relate species distributions to habitat characteristics. Early-successional tree species had strong positive associations with marginal habitats such as inclusions of sandy soil and margins of lakes, wetlands, and rivers. Marginal habitats occupied ~44 % of the landscape, which may help account for the abundance of early-successional species in our study area relative to other hemlock-hardwood forests. Populations of early-successional species in marginal habitats could also have provided important seed sources for the upland mesic landscape matrix, as >70 % of the landscape was within 200?m of these habitats. The degree to which early-successional species were limited to marginal habitats largely followed predictions based on species life-history characteristics, except that white pine was more common than expected in upland mesic habitats. These findings illustrate the potential importance of landscape heterogeneity for persistence of early-successional species in late-successional forest landscapes and provide baseline information on habitat associations and landscape dynamics that will be useful in restoration efforts. 相似文献