共查询到20条相似文献，搜索用时 109 毫秒
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土壤盐渍化是蔬菜作物栽培生产中面临的主要非生物胁迫之一。南瓜（Cucurbita spp.）具有较强的盐胁迫耐受能力，
也是黄瓜、西瓜、甜瓜等葫芦科蔬菜嫁接生产的砧木，选育耐盐性较强的南瓜品种有助于提高南瓜和葫芦科嫁接蔬菜的产量
和经济效益。本文主要对南瓜耐盐性评价方法和耐盐种质资源筛选、南瓜耐盐性形成的生理机制、南瓜耐盐性状的遗传及相
关耐盐基因等研究进展进行综述，并对今后的研究方向进行展望，以期为解析南瓜耐盐调控机制和选育耐盐性品种提供理论
参考。 相似文献
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炭疽病是南瓜主要病害之一,南瓜整个生长期均可发病,轻者减产5％～20％,重者绝收.该文介绍了露地南瓜炭疽病的发病症状、发病规律,并总结了南瓜炭疽病的综合防治技术. 相似文献
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近年来,我地区的南瓜果实出现了不能正常膨大的现象,从而严重的影响了南瓜的商品价值,南瓜的产量和农民的收益,未解决这一问题,笔者进行了大量的田间调查,走访百姓,在生产实践的基础上,归纳出了影响南瓜果实正常膨大的4个主要原因,并总结出了相关的有效防止方案,供瓜农和从事南瓜生产的科技工作者参考。 相似文献
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Cecil C. Konijnendijk Anders Busse Nielsen Jasper Schipperijn Yngve Rosenblad Heldur Sander Mikk Sarv Kirsi Mkinen Liisa Tyrvinen Janis Donis Vegard Gundersen Ulrika kerlund Roland Gustavsson 《Urban Forestry & Urban Greening》2007,6(4):297-309
A review of research and research needs in urban forestry was carried out in Denmark, Estonia, Finland, Latvia, Norway and Sweden during 2005. A questionnaire addressing post-2000 and ongoing research was sent to 146 researchers and generated 76 completed questionnaires. Universities were found to lead urban forestry research, while municipalities headed funding organisations in terms of number of projects funded. Planning, ecological and management aspects were the most common research themes, but socially oriented research also played an important role. The research needs questionnaire was sent to 192 key research actors (assignors, users and researchers), resulting in 63 completed needs assessments. The research themes of ‘urban forest management’, ‘social and cultural values’ and ‘urban forest and green planning’ were prioritised for future research. Comparison of ongoing research and research needs showed discrepancies, as ongoing research does not always cover the same themes identified as primary research needs. Priorities for future research as identified by the research community respective those assigning and using research also differed. Economic assessment of benefits, for example, scored much higher as a need among researchers than other respondents. In terms of present weaknesses in the research ‘infrastructure’, research actors emphasised lack of funding, fragmentation of research and insufficient critical mass. The region's urban forestry research can be enhanced and made more meaningful by strengthening national and international networking within the research community, across disciplines, as well as between researchers and those commissioning and using research. 相似文献
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Research mapping is a method of organising research information as part of a process of formulating a research policy in a specific area. A research mapping project was undertaken in the UK, which aimed to map existing and future research into public and green space, to identify gaps in order to help set priorities for future research, and to develop a freely accessible and searchable database of this research. The mapping was structured around two axes. The first axis was of research themes based on The Value of Public Space but developed further and broken down into sub-themes. The second axis was a typology of green and public space based around Planning and Policy Guidance Note 17 (PPG17) with elaboration from Green Spaces, Better Places. Research dating back to 10 years was collected together with information on recently completed, ongoing and planned UK research. Only research meeting specific quality criteria was included. Some information was also collected at a seminar where attendees from a range of organisations were invited to offer their perspectives on where research priorities should be directed. All the material was analysed and the main trends were identified. Three key cross-cutting themes common to much of the research were identified. These are the general lack of baseline surveys against which to assess progress over time; methodological issues, especially the need to standardise data collection methods and techniques; the classification of social groups, currently considered to be too crude.It was found that most research has been undertaken on physical aspects, such as planning and on biodiversity. Economic values have also been a focus, but on a smaller scale. Social research is quite well covered but very patchy. Management is better covered than maintenance. By far the weakest area represented in the research is health and well-being, both in terms of social groups and types of green space. Priorities for further research were then identified. 相似文献
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我国柑桔生物技术研究进展 总被引：2，自引：0，他引：2
我国柑桔生物技术研究已有２０多年的发展,主要涉及四个方面：（１）胚和胚乳培养以及茎尖微芽嫁接等以解决育种和生产问题。（２）系统建立的基础性工作：原生质体培养与生理研究。（３）人工创造种质的研究：原生质体融合与转基因。（４）分子标记技术在柑桔研究中的应用。对近１０多年以来我国柑桔生物技术研究的进展作了全面的介绍。 相似文献
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Clarifying Integrative Research Concepts in Landscape Ecology 总被引：2，自引：2，他引：0
Integrative research approaches are intensely discussed in landscape ecology, in academia and in research policy. However,
confusion over the terminology hampers communication. Many current landscape ecological research projects have difficulties
to agree on a common understanding of the core concepts associated with different forms of integrative research. This is also
evidenced by the lack of discussion of integrative research concepts in published papers. This hinders integration in research
projects and makes the comparison and evaluation of the outcomes of different research concepts impossible. This paper discusses
and defines the meanings of interdisciplinary and transdisciplinary (= integrative) research approaches to ease discourse
on their application in landscape ecological research. It reviews definitions of the concepts found in the research literature
and develops definitions of integrative and associated research concepts (disciplinarity, multidisciplinarity, interdisciplinarity
and transdisciplinarity) based on their degree of disciplinary integration and involvement of non-academics. Integrative concepts
are viewed as a continuum rather than as fixed categories. The paper discusses the need to develop integrative theory and
methods and argues that we should be more explicit when using integrative research concepts in project proposals, project
work and publications. Finally, the paper reflects on the ongoing discussion in landscape ecology concerning whether it is
developing from an integrative research field towards a discipline in its own right. 相似文献
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The Mediterranean region is facing many challenges, some of which can be addressed by nature-based solutions such as urban forests and green space. However, at best, urban forest research from Mediterranean countries has been only briefly addressed in review papers up to date. This Scopus-based review paper provides first insights into the development of urban forest research in the Mediterranean in the 20-year period from 1996 to 2015. The purpose of the review was to a) analyse distribution of urban forest research in the Mediterranean and identify countries that are forerunners based on the number of publications, b) to analyse distribution of research themes across the Mediterranean and per country, and hence point to research gaps and needs. Researchers from Italy, Turkey and Spain were the most productive in the analysed period. Research is mainly concentrated in the North, while it is scarce to non-existent in South and Eastern Mediterranean countries (excluding Turkey and Greece). Papers dealing with pollution, human health and sociocultural values were the most frequent. Some countries exhibited research specialisation with regard to certain themes. For instance Italian researchers mostly focused on topics related to pollution and urban forest management, the majority of Spanish papers addressed urban forests in the context of human health, while sociocultural values were the main research theme for researchers from Turkey. Papers were analysed also based on research methods, approaches and study locations. Suggested future research includes analysis of the quality of knowledge related to urban forests in the Mediterranean as well as of collaboration between researchers, research institutions and countries. 相似文献
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为系统梳理生物炭对土壤微生物活动、群落等方面影响的研究进展和未来发展趋势,以2007-2020年Web of Science核心合集数据库中针对生物炭调控土壤微生物的文献为样本,采用文献计量学软件CiteSpace对文献的年发文量、研究力量和研究热点进行了可视化分析。从论文数量和质量来看,近年来以生物炭为主题对土壤微生物研究的发文数量呈现急剧增长趋势,发文数量最多的国家是中国和美国。文献排名TOP 10的科研机构有中国科学院、浙江大学和康奈尔大学等,作者分析显示科研团队之间存在深入的学术交流。基于关键词聚类分析和突现词分析,研究主题热点集中在不同材质、温度等条件制备的生物炭对土壤微生物群落结构、细菌和古菌的影响。该领域未来应更加注重生物炭改变土壤微生物的内在机理研究,提高生物炭和土壤微生物的联合作用关注度。 相似文献