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在全球化和国家大力推动弘扬地域文化的背景下，遗产保护领域的内涵与外延不断扩展，遗产及其周边景观环境整体性保护有广阔的研究空间。为深入探究遗产及周边景观环境的整体性保护，以中英文“遗产景观”为主题词，以发布于2002年1月1日—2022年1月1日的2 352篇Web of Science核心文集和中国知网的1 179 篇核心期刊文献为分析对象，辅助运用VOSviewer软件对文献内容进行计量分析，得出：1）国外研究热点集中于生物多样性保护、可持续发展、遗产景观与旅游、考古遗址四大领域；国内研究热点主要包含文化景观、世界遗产、文化遗产、工业遗产四大领域。2）国内外遗产景观保护领域在研究视角、研究内容与研究方法上有一定差异。总体而言，国外以构建遗产景观整体环境基底为核心，提出科学动态的可持续性保护策略；国内多深入研究典型性遗产，在梳理与借鉴国外保护思路的基础上提出适宜性保护策略。3）面对现今遗产景观保护地的复杂性与多样性，遗产景观整体性、综合性的保护将成为未来该领域的研究重点。 相似文献
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九十年代中国景观生态学文献分析及研究进展 总被引：2，自引：0，他引：2
本文通过文献检索对90年代期间景观生态学文献及论著进行了分析。分析结果表明,景观生态学研究在过去十年中获得了突飞猛进的发展。通过不完全统计,中国研究人员在国内外发表有关文献619篇以及中、英文著作13部,其中90% 以上是在国内发表的。基础理论方面和应用方法的文献分别占39.6% (245篇)和23.6% (146篇)。依据不同的研究内容,中国90年代景观生态学研究文献被分为9类。城市景观生态学的文献数量排列第一,占全部统计文献的13.4%;其次是区域、流域景观,寒区、旱区景观,森林景观,生境与生物多样性,农业景观,湿地景观,城郊景观以及植物景观。根据分析结果,作者对中国的景观生态学研究目前存在的问题和发展趋势进行了讨论。表3参42。 相似文献
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近十年我国竹叶研究论文的调查与分析 总被引：9，自引：3，他引：9
根据《中国期刊网题录数据库》、《中国期刊网专题全文数据库》、《中国林业文摘》、《竹类文摘》统计了1992～2001年10年间我国竹叶研究文献，并对研究文献的时间分布、空间分布、内容分布和作者分布进行了简要分析，展示出我国竹叶研究文献分布概貌。 相似文献
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《中国城市林业》2021,(4)
小气候作为城市人居环境相关学科研究的重要领域,研究体系庞杂且与多学科交叉融合。文章以2008—2020年Web of Science~(TM)核心合集数据库检索到的6304篇小气候英文文献为研究对象,利用CiteSpace5.6.R2科学知识可视化图谱软件对文献进行分析,旨在为风景园林、建筑技术、城乡规划、生态环境、能源学等领域的科学研究提供理论依据和方法指导。结果表明,小气候英文文献的研究主要集中在室外热舒适、气象资料、溪流温度、边缘效应、无人机辅助红外热像等方面,研究前沿为平均辐射温度、空气质量、气流纵横比、城市健康、能量效率、城市排放、气候适应性设计和规划策略等。 相似文献
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近十年我国核桃文献浅析 总被引：1，自引：0，他引：1
从1994年至2003年在中国期刊全文数据库中刊登了1059篇核桃文献。通过对这些文献的年代分布、期刊分布、内容分布、产出单位和核心作者等进行统计分析，提出了核桃文献的年代分布特征、内容分布特点、发表核桃文献的核心期刊和核心单位；运用布拉德福文献规律衡量了核桃文献的离散状态，揭示了核桃研究在我国的成熟性和发展趋势；找出了我国核桃研究的热点和薄弱环节，为生产实践提出了决策性参考意见。 相似文献
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随着我国生态文明建设事业的深入推进,生态旅游与森林游憩、自然景观资源开发等逐渐成为各地践行“绿色青山就是金山银山”新发展理念,实现生态价值转化的重要路径。景观美学已融入林学、生态学、风景园林等传统学科,景观美学价值定量评估作为生态系统服务价值核算和景观设计的关键指标,成了相关研究的热点领域。基于CiteSpace软件,运用文献计量等方法分别从中国知网（CNKI）数据库中收录的1 048篇、Web of Science核心合集1 455篇景观美学研究文献,从年发文量、主要关键词、景观类型、研究方法等多个视角,分析国内外该领域研究热点与发展趋势。结果表明：国内的景观美学研究起步较晚,近几年科研产出量显著增加,但与国际相比还存在一定差距;研究对象类型以森林景观和城市景观,国外以湿地、荒野等自然生态景观为主,国内偏向于小型景观,研究视野较为局限;国内研究重点关注景观美景度、景观规划配置等社会价值方面的研究,国际上更重视景观美学资源的生态价值和文化价值的研究;国内景观美学方面存在研究方向分散、评价方法主观性较强、成果创新性弱等问题。建议今后加强学科交叉融合与国际合作,完善景观美学研究体系,更新研... 相似文献
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基于WOS(Web of Science)和CNKI(中国知网)数据库,对1990～2021年长江流域生物多样性研究领域的论文进行了文献计量分析,主要从发文的数量、被引用、期刊分布、研究机构、科研人员等方面,利用VOSViewer和Ucinet-Netdraw可视化软件,分析了机构和作者合作以及研究热点等。结果表明：年际发文量整体呈上升趋势;Ecological Indicators和《生态学报》分别是WOS和CNKI数据库的主要发文期刊,Global Change Biology和《生态学报》分别为该领域的顶级期刊;中国水产科学研究院和中国科学院为核心研究机构;刘凯和王丁对长江流域生物多样性研究领域的贡献最大;基于CNKI和WOS文献的研究热点分别为水生生物遗传多样性研究和基于微卫星分子标记技术的物种遗传多样性研究等。 相似文献
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《Scandinavian Journal of Forest Research》2012,27(5):427-435
In Scandinavia, moose (Alces alces L.) sometimes cause severe browsing damage to economically-important pine. Moose-vehicle accidents have spurred construction of fences along roads, and these may interfere with moose migration between summer and winter ranges, or the road alone may be a barrier. If this happens and moose build up along roads, landowners may suffer economically. Therefore, this study investigated whether roads, fences or other factors influence the use of young pine stands by moose. Eighty stands along roads in northern Sweden were evaluated in which individually-browsed branches were counted on 9972 pines. Moose browsing was not significantly related to birch (Betula pendula Roth, B. pubescens Ehrh.) density, nor did it differ between pines (Pinus contorta Douglas or P. sylvestris L.). However, increased pine density, site productivity and proximity to a highway were associated with increased browsing. Further large-scale studies are needed to understand moose habitat selection and the effects of roads. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(3):206-217
The root systems of 2-yr-old Picea glauca, Picea mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artificial frost to induce different levels of root damage. Frost-damaged and control seedlings were placed in a greenhouse under high and low soil moisture regimes. Seedling growth and physiology were evaluated periodically. Seedling survival was reduced when root damage reached levels of 60-80%. Root systems of all three species showed partial to total recovery by the end of the experiment. In general, root freezing damage caused reductions in seedling growth, with these reductions becoming less significant over time. Root damage had little to no effect on black spruce and jack pine seedling physiology, while white spruce CO 2 uptake decreased with increasing root damage. Shoot nitrogen content of all three species decreased slightly with increasing root damage. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1):53-61
This study investigated the stand structure in pine, spruce and deciduous forests in the border district of Finland and Russia. A total of 46 mature forest stands was selected as pairs, the members of each pair being as similar as possible with respect to their forest site type, age, moisture and topography. The stands were then compared between the two countries by means of basal areas and number of stems. The proportions of dominating tree species were 2-12% lower, and correspondingly the proportions of secondary tree species higher, in Russian forests. The density of the forest stock was also higher in each forest type in Russia. The forests in the two countries differed most radically in terms of the abundance of dead trees. The amount was two to four times higher in Russian deciduous and spruce forests, and in pine forests the difference was 10-fold. The stand structures indicated that Russian coniferous stands, in particular, were more heterogeneous than intensively managed pine and spruce stands in Finland. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1):15-27
The root collar diameter and the height:diameter ratio are of particular importance in container-grown seedlings where a high density in the containers may produce spindly seedlings. Temperature regimes and light quality are known to affect plant growth. The aim of this study was to identify responses in Picea abies (L.) Karst. seedlings grown with light providing different red:far-red ratios and under temperature regimes with alternating day (DT) and night temperature (NT) from negative (DT < NT) to positive (DT > NT) difference (DIF) between DT and NT. Experiments were conducted in controlled environment chambers and in a daylight phytotron. Only limited thermoperiodic responses appeared in P . abies seedlings with respect to seedling height and dry weight accumulation. The formation of terminal buds, however, was clearly delayed in seedlings grown at negative DIF. The results indicate a requirement for day extension light that is high in far-red, to prevent terminal bud formation under natural short-day conditions. An extended study should be conducted to clarify the minimum level of light intensity and the optimal light quality needed to prevent terminal bud formation under natural short-day conditions. 相似文献
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本文分析了CAD在设计中引起的正面和负面影响,并进行了系统的阐述,从而使设计者在应用中能够保持客观的态度。 相似文献
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《Scandinavian Journal of Forest Research》2012,27(2):131-138
The effects of soil scarification (mounding), slash removal and clear-cut age on the natural regeneration in clear-cuts was evaluated using data from four sites in southern Sweden. The treatments were carried out during a good seed and establishment year for birch ( Betula pubescens Ehrh. and B. pendula Roth). Scarification had the strongest positive effect on the density of naturally regenerated seedlings, especially in birch, but also in pine ( Pinus sylvestris L.) and spruce [ Picea abies (L.) Karst]. Slash removal had a positive effect on birch density. No statistically significant effect of clear-cut age was found. In addition, no statistically significant interactions between clear-cut age and scarification or slash removal were found. The ingrowth of field vegetation was the fastest in areas that were not scarified, less rapid in areas scarified on old clear-cuts, and the slowest after scarification in fresh clear-cuts. In conclusion, it may be possible to control the density of birch during a good establishment year for birch. If birch is desired, the best combination of treatments is to remove the slash and scarify; otherwise, these treatments should be avoided. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(5):472-479
Based on an enquiry, risk perception among non-industrial private forest owners is described in relation to climate change and forestry hazards. Of the respondents, 11% took action to remedy the effects of climate change. Out of a given set, hazards were ranked according to each respondent's experience of recent substantial financial loss to the estate and in relation to his or her willingness to make investments aimed at risk reduction. For each hazard, the respondent assessed the risk in four classes ranging from very high to negligible risk. Six hazards were considered most problematic in all three aspects: browsing damage, falling timber prices, damage by wind, spruce bark beetle, root rot and pine weevil. A majority of the respondents claimed to take action to reduce the risk associated with at least one hazard, while 35% did not know whether they did. Excluding climate change, the need for decision support was the largest in relation to damage by wind owing to a combination of perceived high risk and a high level of ignorance in relation to whether risk-reducing measures were taken. 相似文献
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Srisuda Thippayarugs Banyong Toomsan Patma Vityakon Viriya Limpinuntana Aran Patanothai Georg Cadisch 《Agroforestry Systems》2008,72(2):137-148
In situ produced plant residues contain a mixture of different plant components of varying quality. To assess synergistic
or antagonistic interactions occurring during the decomposition and mineralization of such mixtures, individual plant parts
(stems, leaves, leaf litter and roots) or the mixture of stems, leaves and leaf litter of the agroforestry species pigeonpea
(Cajanus cajan) or of crop residues of peanut (Arachis hypogaea) or of the weed hairy indigo (Indigofera hirsuta) were incubated in pots for 19 weeks. Periodically, remaining plant residues were sieved out (>2 mm), weighed and N content
as well as soil mineral N determined. Above- and below-ground residues of peanut decomposed fastest and showed the largest
N release in agreement with their high N concentration and low-acid detergent fibre (ADF) : N ratio. Hairy indigo was hypothesized
to be of lower quality than pigeonpea because of its high-polyphenol content. However, it decomposed faster than pigeonpea,
largely because of the higher N and lower lignin concentration of its components. Ranking of individual plant components for
N mineralization resulted in the following pattern, leaves > leaf litter > roots > stems. In mixtures of the different plant
components a similar species order in decomposition was obtained, e.g. peanut > hairy indigo > pigeonpea. The amount of N
released from the mixture was dominated by stem material that comprised 46–61% of the mixture. The interactions in mixtures
were relatively small for peanut (generally high-quality components) as well as for pigeonpea (low proportion of high-quality
components, i.e. N rich leaf material). However, a positive interaction occurred during later stages of N mineralization in
the mixture of hairy indigo as it had a significant proportion of N rich components and absence of highly reactive polyphenols.
Thus, for plants with low to intermediate chemical quality attributes, manipulating plant composition (e.g. by varying harvest
age, affecting stem and leaf proportions) will be important to obtain significant interactions during decomposition when its
components are mixed. 相似文献
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A. Rigueiro-Rodríguez M. R. Mosquera-Losada E. Gatica-Trabanini 《Agroforestry Systems》2000,48(3):245-256
The use of organic waste materials such as milk sewage as an organic fertilizer could have the dual advantages of organic-waste
disposal and reduced dependence on inorganic fertilizers. The effects of fertilization with (1) conventional mineral fertilization,
(2) milk sewage sludge at 40 kg N ha−1 target rate and (3) no fertilization on pasture production and tree growth were examined in an experiment consisting of two
pasture mixtures under a one-year-old Pinus radiata plantation with a density of 2500 trees ha−1. The two pasture mixtures were: (1) Dactylis glomerata L. var. saborto (25 kg ha−1) + Trifolium repens L. group Ladino (4 kg ha−1) + Trifolium pratense L. var. Marino (1 kg ha−1); (2) Lolium perenne L. var. Tove (25 kg ha−1) + Trifolium repens L. group Ladino (4 kg ha−1) + Trifolium pratense L. var. Marino (1 kg ha−1). The experiment began in the spring of 1995 using a randomized block design with three replicates in Castro Riberas de Lea
(Lugo, Galicia, north-western Spain). Plot size was 12 × 8 m2, with a 1 m buffer strip between plots. Two-year data showed that fertilization with either material had a positive effect
on pasture production, with no significant difference between the two fertilization treatments. Tree growth in the milk sewage
sludge plot was significantly higher than in the control plots. Inorganic fertilization increased pasture production, but
affected tree growth negatively. The results show that milk sewage sludge could be used as a fertilizer in silvo-pastoral
systems.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献