共查询到19条相似文献，搜索用时 171 毫秒
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常绿阔叶树种在石家庄园林景观中的应用 总被引：1，自引：0，他引：1
调查了石家庄园林中常绿阔叶树种类、越冬表现及园林应用形式,根据常绿阔叶树种的生态习性及越冬表现;讨论了石家庄引种一些常绿阔叶树的可行性及常绿阔叶树种在石家庄冬季园林景观中的作用。 相似文献
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浅谈江苏园林绿化中常绿、落叶树种的配植 总被引：5，自引：1，他引：4
从常绿、落叶树种的生态习性及江苏省常绿树种的自然分布特点,探讨了落叶、常绿树种在园林绿化中的利用。认为徐淮地区、里下河、滨海盐土区不适宜常绿树种的生长,树种配植应为落叶阔叶树,而盱眙、六合丘陵、宁镇山脉及茅山山脉和长江三角洲丘陵地区可栽植少量耐寒性较强的常绿树种,但应以落叶阔叶树种为主。而在太湖沿岸及宜兴、溧阳较为适宜常绿阔叶树种的生长,可考虑增加常绿阔叶树种的种类及栽培规模。并认为,不必刻意追求单一的景观效果,常绿、阔叶树树种均具园林价值。 相似文献
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南京地区引种的6种常绿阔叶树种抗寒性测试 总被引：1，自引：0，他引：1
选取南京地区已引种成功的6种常绿阔叶树种,运用越冬适应性观察与电导法作为对比测试手段,分析这些树种的抗寒能力。结果表明,采用低温循环仪自动降温程序模拟冰冻处理来测试叶片的相对电导率,计算出各树种的半致死温度(LT50)能定量地反映这些树种本身的抗寒能力高低,并且与它们在南京地区越冬适应性的观察基本相符。这些研究结果对预测常绿阔叶树种抗寒能力以及在较高纬度地区园林中的应用具有指导意义。 相似文献
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长三角城市群园林绿化程度很高,但一些城市仍缺少乡土树种特色,危及生态系统稳定。长三角地跨北、中两个亚热带,有三类林木群落组成,即含有常绿阔叶树种的落叶阔叶林、落叶常绿阔叶混交林、常绿阔叶林。长三角范围乡土树种丰富,城市绿化以乡土树种为主,应大力推广应用。 相似文献
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以连云港城区25处典型绿地为对象,采用全面调查的方法,对连云港城区常绿阔叶树种类、生长状况、冻害状况进行了调查研究,结果表明:连云港城区常用阔叶树种有乔木11种,涉及8科10属,灌木及藤本28种涉及17科21属。根据调查结果,对常绿阔叶树种在连云港的应用进行了分析,并为连云港市常绿阔叶树种的开发应用、引种驯化方面的研究提出了建议。 相似文献
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To confirm that freeze-thaw embolism is a primary stress for evergreen woody species in winter, hydraulic conductivity, photosynthesis and leaf water potential were measured during fall and winter in trees growing in a cool temperate zone (Nikko) and in a warm temperate zone (Tokyo). We examined two evergreen conifers that naturally occur in the cool temperate zone (Abies firma Siebold & Zucc. and Abies homolepis Siebold & Zucc.), and four evergreen broad-leaved woody species that are restricted to the warm temperate zone (Camellia japonica L., Cinnamomum camphora (L.) J. Presl, Ilex crenata Thunb. and Quercus myrsinaefolia Blume). In Tokyo, where no freeze-thaw cycles of xylem sap occurred, hydraulic conductivity, photosynthesis and water balance remained constant during the experimental period. In Nikko, where there were 38 daily freeze-thaw cycles by February, neither of the tracheid-bearing evergreen conifers showed xylem embolism or leaf water deficits. Similarly, the broad-leaved evergreen trees with small-diameter vessels did not exhibit severe embolism or water deficits and maintained CO(2) assimilation even in January. In contrast, the two broad-leaved evergreen trees with large-diameter vessels showed significantly reduced hydraulic conductivity and shoot die-back in winter. We conclude that freeze-thaw embolism restricts evergreen woody species with large-diameter vessels to the warm temperate zone, whereas other stresses limit the distribution of broad-leaved trees, that have small-diameter vessels, but which are restricted to the warm temperate zone. 相似文献
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Yasuhiro Kubota 《Journal of Forest Research》2006,11(3):191-201
This article reports the regeneration dynamics of a temperate Abies–Tsuga forest in Kirishima Yaku National Park, southwestern Japan, and examines the influence of species coexistence mediated by
gap disturbances on biomass production. All trees taller than 2 m in a 1-ha plot were monitored over four growing seasons.
Three growth-form groups occupied different vertical layers. Evergreen conifers and deciduous broad-leaved trees tended to
be spatially segregated from evergreen broad-leaved trees, which formed thickets in the understorey. The regeneration of understorey
evergreen broad-leaved trees was affected by canopy gaps. The recruitment of conifers and deciduous broad-leaved species was
not observed during the four growing seasons. This suggests that regeneration is sporadic and the present environmental conditions
are not favorable for these canopy species. The mortality and unsuccessful recruitment of conifers and deciduous trees appeared
to cause fluctuations in the productivity of the stand. However, an abundance of canopy gaps accelerates the regrowth of shorter
species, and the fluctuation of productivity resulting from the population dynamics of canopy species would be partly mitigated
by the regeneration of evergreen understorey species. The horizontal and vertical heterogeneity of the temperate mixed forest
was a result of the patch structures of the three growth-form groups. The different regeneration patterns among the three
groups, which were driven by interactions of species-specific regeneration niches and disturbance regimes, might be an important
factor in maintaining the aboveground productivity in a transitional mixed forest between warm-temperate and cool-temperate
zones. 相似文献
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在调查群落种类组成的基础上,对三峡库区3种典型森林主要组成树种的种群结构进行分析,并推断群落的演替趋势.结果表明:1)三峡库区森林群落乔木层优势种主要为马尾松、柏木等针叶树种,短柄袍栎、栓皮栎等落叶阔叶树种及多脉青冈、石栎等常绿阔叶树种;2)针叶群落中乔木层个体高度级频度顶点位于10～15 m,针阔混交群落与阔叶群落为5～10 m;3)阔叶群落中短柄袍栎和栓皮栎等优势种的胸径频率为逆J字型,伴生树种主要为L型或逆J字型,主要组成树种的种群结构表明优势种种群处于稳定状态;4)针阔混交群落针叶优势种的种群属于单峰型和逆J字型的衰退类型,阔叶树种多为逐渐增长的L型或间歇性发展的多峰型;5)针叶群落优势树种胸径频率属于典型的单峰型,伴生树种为单柱型或L型;6)由主要组成树种的种群结构推断三峡库区森林群落演替过程为针叶林群落→针阔混交林群落→常绿阔叶林群落.研究结果为三峡库区生态建设和森林资源管理提供科学依据. 相似文献
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通过现场踏勘和典型样地法,对杭州新地标钱江新城CBD公园植物景观进行调查,并对其植物多样性和植物群落结构作了相关分析。结果表明,钱江新城CBD公园现有种子植物60科85属108种（含种以下等级）,植物种类比较丰富,其中乔灌草、常绿与落叶乔木、常绿与落叶灌木种类比例较为合理,植物景观表现多样;植物群落结构以复层混交型为主,主要包括落叶阔叶林、常绿阔叶林、常绿落叶阔叶混交林3类,季相景观和生态性较为明显;积极可进入型、消极可进入型、不可进入型3个类型植物空间,分别占22.2％、16.7％、61.1％,绿地空间类型多,但对城市公园来说,可进入型空间比不可进入型空间更重要,应适当增加可进入型植物空间来满足钱江新城CBD公园人口相对集聚性特点。 相似文献
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The abandonment of sites after clearcutting plantations is increasing rapidly in Japan. Although a few stand-level studies
have been conducted, a broad-scale study is needed to understand the general tendency of vegetation recovery and to obtain
information for the management of such extensively distributed abandoned clearcut sites. This study is a province-level study
that aims to interpret the patterns and factors in early-stage vegetation recovery at abandoned plantation clearcut sites.
We also discuss the potential indicators that may determine whether a certain site recovers towards evergreen broad-leaved
forest consisting of Castanopsis cuspidata and Quercus glauca or towards deciduous broad-leaved forest comprising Q. serrata and Q. acutissima. A cluster analysis revealed that five types of vegetation (evergreen trees, evergreen trees–deciduous pioneer shrubs, pioneer
species, deciduous trees, and deciduous shrubs) were observed from an early stage of succession. The first two vegetation
types were considered to recover successfully to the target vegetation of evergreen broad-leaved forest, but the remaining
three vegetation types did not show any tendency to recover to the target vegetations. According to the results of the detrended
correspondence analysis, a smaller size of the abandoned site with adjacent evergreen broad-leaved forest and a longer time
after clearcutting were identified as factors that enhance the invasion of evergreen tree species; these factors are also
useful to predict the future successional tendency. In conjunction with these factors, the existence of regeneration sources
(i.e., stumps) that allow sprouting appeared to be an important indicator for predicting the early-stage vegetation recovery. 相似文献
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[Objective]To study the leaf calorific value of different forest types.[Method]This study focused on four common forest types widely distributed across China, including boreal coniferous forest, warm temperate deciduous broad-leaved forest, subtropical evergreen broad-leaved forest, and tropical monsoon forest. The leaf calorific values of 175 dominant (or common) tree species were measured. The leaf calorific value characteristics of the trees found in the different forest types were analyzed, and the primary factors affecting leaf calorific value were investigated, including leaf morphological traits, nutrient elements, climate, and soil traits. [Result]The results showed that in these forest types, the leaf calorific values ranged from 14.84 to 21.98 KJ·g-1, with an overall mean of 19.06 KJ·g-1. The presence of organisms appeared to affect the leaf calorific value, which differed among forest types as follows: coniferous trees > broadleaf trees or evergreen trees > deciduous trees. [Conclusion]The latitudinal pattern of tree leaf calorific value, ordered from north to south, is as follows: warm temperate deciduous broad-leaved forest > subtropical evergreen broad-leaved forest > tropical mountain rainforest. The mean leaf calorific value of boreal coniferous forest was slightly lower than those of warm temperate deciduous broad-leaved forest and subtropical evergreen broad-leaved forest. The leaf calorific values were significantly correlated with leaf carbon content (R2= 0.89, P<0.001). A multiple regression equation was established to describe the relationships among leaf calorific value, leaf carbon content, leaf nitrogen content, and leaf thickness. 相似文献
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中国南部九连山常绿阔叶林的区系组成和林分结构 总被引：6，自引：0，他引：6
在中国南部的九连山研究了天然的和择伐过的常绿阔叶林的树种组成和林分结构.主要构成树种是常绿阔叶的栲树(Castanopsis fargesii)、罗浮栲(C.fabri)、甜槠栲(C.eyrei)、米槠栲(C.carlesii)、南岭栲(C.fordii)、鹿角栲(C.lamontii)和木荷(Schima superba).常绿针叶树种的马尾松(Pinus massoniana)和杉木(Cunninghamia lanceolata)也是主要成分.马尾松在坡脊和坡的上部占优势.许多落叶阔叶树种,如光皮桦(Betula luminifera)和拟赤杨(Alniphyllum fortunei)以较低的优势与常绿阔叶树种共同出现.它们补丁状分布在择伐过的林分中.种内的分布格局和种间的空间分布关系表明,主要构成种之间的空间集中分布地的分离是在一个小的尺度上. 相似文献