树种

Salix babylonica, Prunus persica, Populus euramevicana "I-214" and Pterocarya stenoptera were the main species according to their abundant individuals and relative dominance.

扬州瘦西湖公园的树种多度与基于叶面积的相对优势度之间无明显关联，数量上占优势的树种，其相对优势度不一定很高。

Fire and human activities increased the domination of oak forests because of their biological features of oak trees. Cutting repeatedly was the main reason for the domination of Quercus mongolica forest in recent 100 years in north and east China. During the succession of ...

火是原生性质蒙古栎林在地质历史时期存在和扩散的根本原因，过度的人类活动是促成现在蒙古栎次生林占优势地位的主要原因，这是由蒙古栎这个树种的生物学特性决定的，在没有外界因素的干扰和火减少的情况下，蒙古栎在演替过程中逐渐被耐荫的树种所取代，但是在中国北方，由于人类活动的加剧，蒙古栎林的优势度有增加的趋势。

Rosaceae Cherryis the case of a small shrub, for our unique fruit trees, is a fruit, wood, flowers, multi-purpose ecological medicine species, with high survival rate, grow fast, use a wide number of characteristics of high efficiency excellent species.

钙果是蔷薇科樱桃属的一种矮小灌木，为我国特有的果树，是集果、木、花、药多用途的生态型树种，具有成活率高、生长快、用途广、效益高等诸多特点的优异树种。

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.

结果表明：1梅州城区行道树共有13科18属23种7133株，其平均胸径、平均冠幅、平均树高分别为27.59cm，4.10m，6.94m，总体上看，平均冠幅偏小；2物种丰富度指数S、Shannon-Wiener指数H和Simpson指数D偏小且各道路间差异明显，说明各道路行道树存在一定程度的物种单一性、层次的单调性；3梅州市城区行道树优势树种是大叶榕、垂榕、大王椰子，次优势种为海南榄仁、阿珍榄仁、阴香，它们是梅州城市街道绿化的好树种。

Signi?cantly greater numbers of oviposition sites were found on sugar maple, Acer saccharum Marshall,than on red maple, Acer rubrum L.,green ash, Fraxinus pennsylvanica Marshall,or red oak, Quercus rubra L.,with no significant differences among the other three tree species. Similarly,signi?

在温室条件下，我们在糖枫树上发现的产卵点要明显多于红糖槭、白蜡树、红橡树，而在红糖槭、白蜡树、红橡树这3种树种间则没有显著的差别，同样，在糖槭树上，我们发现的活的幼虫的数量也显著大于其它3个树种上的。

Of family Salicaceae and is characterized by rapid growth, high adaptability and wide employment. It has been cultivated in many countries and become one of the tree species with the broadest distribution and the highest timber production in the mid-latitude areas.

树种的统称，由于其生长快、适应性强、用途广而被世界许多国家和地区广泛进行栽培，是当今世界中纬度地区栽培面积最广、木材产量最多的一个树种。

Most herbivores feed in secondary forests because pioneer species in secondary forests do have little or no mechanical or chemical protection against herbivores and many early and late seral tree species in secondary forests produce edible fruits in large quantities. Environment and fire have some effects on secondary forest succession. In early succession, relatively more biomass is allocated to resource acquiring tissues and in later stages more is allocated towards structural materials.

大多数食草动物喜欢在次生林中取食，因为次生林中的先锋树种很少或没有机械和化学保护和林内许多树种产生大量可食用的果实；环境和火对次生林演替有一定影响；在早期的演替过程中，更多的生物量分配到资源需求旺盛的组织，在演替晚期阶段，更多的生物量则分配到结构组织中。

Themain results are as follows:(1)The utilization-oriented silvicultureshould be regarded as a silvicultural regime or system,that can bestsatisfy the special economic,social or ecological demand for a given regionwith lowest cost and fast speed,using specifically oriented,systematic andadvanced technical measures on the basis of characteristics of tree species,natural and economic conditions and local technical and development levels.

主要研究结果如下：(1)定向培育应该做为一种森林培育制度来对待，即定向培育是根据经济、社会和生态上的特定要求，确定相应的培育目标，然后根据造林地区和造林地的条件，造林树种或树种组合的特性，以及当地经济和技术水平，采用相应专向，系统、先进、配套的培育技术体系，以可能的最低成本和最快速度，达到定向要求的一种森林培育制度。

This thesis investigates the main landscape factors in residence and emphasized on planning landscape, investigating、 analyzing and summering their genenal level of virescence、 the variety of the plant、 the proportion between evergreen and broad-leaved trees、 the charaters of planting in different districts and on this basis, this thsis puts forward the basic principle, main guide line、 planning variety and design mode of plants and provides scientific foundation for the ecological development and construction of residence.

在此基础上，以作者工作所在地上海市为研究对象，选取绿化景观营造较为成功并具一定知名度的典型居住区，如高档居住区&海源别墅一期&、&西郊宾馆别墅四期&、&月湖山庄一期&，公寓居住区&上海知音&、&上海宏润花园&、&大华清水湾二期&等，对其主要的景观要素进行实地调研，并以植物景观为重点，对其总体绿化水平、应用的植物种类和配植手法、常绿和落叶树种的比例、分区种植特点进行调查、分析和总结，并据此提出了上海市不同居住区绿色景观环境建设的基本原则、主要指标、树种规划和植物配植模式，为居住区的生态化建设发展提供科学依据。

Reading corner was set up in schools adjacent to the main building, in addition to planting trees keynote Syzygium, San kapok tree planting theme, The momentum of its towering Cui Ping inspire students to strive to excel, to establish tolerance loss stone addition, to create homework. o'clock in the best places

七读书角设立于学校主体建筑侧，除种植基调树种蒲桃外，散植主题树种木棉，其参天的气势激励苹萃学子奋发向上，设立耐损耗的石桌凳，为学生营造晨读，午休之最佳场所

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。