检索结果-南通市图书馆

Nitrogen pollution and source identification of urban ecosystem surface water in Beijing

Frontiers of Environmental Science & Engineering 2014年第1期8卷 106-116页

作者： Yufen REN Zhiwei XU Xinyu ZHANG Xiaoke WANG Xiaomin SUN D. J. BALLANTINE Shengzhong WANG State Key Laboratory of urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Key Laboratory of ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China College of urban and Environmental Science Northeast Normal University Changchtm 130024 China National Institute of Water and Atmospheric Research Hamilton 3216 New Zealand

Nitrogen contamination of surface water is a worldwide environmental problem with intensive agricul- ture and high population densities. We assessed the spatial and seasonal variation in concentrations of total nitrogen and different nitrogen species present in surface-water in Beijing, China. Also, chemical （NO3-N/C1-） and isotopic （615Nnitrate） indicators were used to identify nitrate sources. The results showed that, during 2009 and 2010, nitrate nitrogen concentrations ranged from 0.7 to 7.6 mg· L^-1, ammonium nitrogen from 0. I to 3.4 mg· L^-1, and total nitrogen from 2.4 to 17.0mg· L^-1. Inorganic nitrogen accounted for between 60 and 100% of total nitrogen at the ten monitoring sites. Nitrate nitrogen, ammonium nitrogen, and total nitrogen concentrations at the 2 downstream monitoring sites in south-eastern Beijing were significantly higher than those at the other eight upstream monitoring sites （P 〈 0.01）. Examination of seasonal variation showed that there was a significant inverse relationship between nitrate nitrogen concentrations and precipitation, and that nitrate nitrogen concentrations peaked in the dry seasons. The information given by the 15Nnitrate values and nitrate nitrogen concentrations, combined with the NO3-N/C1- ratio distribution, showed that domestic sewage was the major source of nitrate in Beijing. Methods to control and reduce sewage pollution are urgently needed to help manage surface water quality in Beijing.

关键词： nitrogen concentration spatial and seasonalvariation stable nitrogen isotope urban ecosystem source

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sustainability analysis of the urban ecosystem in Guangzhou City based on information entropy between 2004 and 2010

引用

Journal of Geographical Sciences 2013年第3期23卷 417-435页

作者： LIN Zhenming XIA Bin Guangzhou Institute of Geochemistry CAS Guangzhou 510640 China University of Chinese Academy of Sciences Beijing 100049 China School of Marine Sciences Sun Yat-sen University Guangzhou 510275 China

The urban ecosystem possesses dissipating structures that can absorb substances and energy from the external environment and export products and wastes to maintain order within the system. Given these circumstances, this paper analyzed the ability of the urban ecosystem in Guangzhou City to sustain development from the perspective of entropy. The research was carried out in three steps. First, an evaluation index system that considers the ability of the urban ecosystem for sustainable development was formed based on the struc- tures and functions of the urban ecosystem and the change in the entropy of the urban so- cioeconomic ecosystem. Second, the sustainable development ability assessment model for the urban ecosystem was built using information entropy. Last, by combining the time series variation of the evaluation indicators with the entropy weights, this paper analyzed the influ- ence of the combined factors on the sustainable development ability of the urban ecosystem in Guangzhou and suggested some measures to promote the sustainable development of the urban ecosystem in Guangzhou. The conclusions of this study can be summarized as follows：（1） The urban ecosystem has developed in an orderly and healthy direction, with effective control over the urban environmental pollution problems in Guangzhou between 2004 and 2010. （2） The sustainable development ability of the urban ecosystem had been on an up- ward trend in Guangzhou during the study period. The ability of the natural urban ecosystem to support the urban socioeconomic ecosystem increased continuously, and the improved ecoenvironment enhanced the harmony and vitality of the urban ecosystem in Guangzhou.

关键词： urban ecosystem entropy change information entropy sustainable development Guangzhou City

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An interactive simulation model of urban ecosystem and its implementation

引用

Journal of Environmental Sciences 1992年第1期4卷 15-22页

作者： Lu Yonglong, Yang Bangjie Wang RusongResearch Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100080, China

An interactive simulation model is established based on the methodology of 'sensitivity model' (SM) during the cooperative research process between the founders of SM and the authors. And the conceptual framework of SM is developed into the interactively qualitative and quantitative simulation model presented in this paper, which makes it possible to break down a complex urban ecosystem into simple and visual quantitative or qualitative relationships between the factors. By studying the dynamic responses of the system to the changes of the inputs and parameters of the model, future trends in urban development can be predicted and strategies formulated. The whole process is realized on micro-computer in the course of man-computer interaction. Its potential use is shown in a case of Tianjin City.

关键词： ecological simulation model urban ecosystem system analysis.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nesting tree characteristics of heronry birds of urban ecosystems in peninsular India： implications for habitat management

引用

Current Zoology 2017年第6期63卷 599-605页

作者： Ramesh ROSHNATH Palatty Allesh SINU Department of Animal Science Central University of Kerala Padannakad Kerala PO 671314 India Department of Ecology and Evolutionary Biology Bioscience West University of Arizona Tucson AZ 85721 USA

Wetland ecosystems, particularly the mangrove forest, are the primary wild habitat of heronry birds. However, urban ecosystems have become a favorite breeding habitat of these birds. To provide inputs into the habitat management for conservation of these birds, we investigated the quantitative and qualitative characteristics of nesting trees of heronry birds in the urban environment of the North Kerala region of peninsular India. Census on nesting trees was done in 3 major microhabitats of the urban ecosystem: avenues of national highways and towns, nonresidential plots, and residential areas apart from the mangrove islets in the peri-urban locality. The study found that 174 trees of 22 species hosted 1,928 heronry bird nests in the urban habitats; mangrove forests, although plentiful in the study area, hosted only about 20% of the total nests encountered in the study. Rain trees (43.7%) were the most available nesting tree. The greatest number of nests and nesting trees were encountered on the roads of urban areas, followed by nonresidential areas and residential areas. The differences in the observed frequencies of nesting trees in 3 microhabitats and in 3 types of roads (national highways > state highways > small pocket road) were significant. Canopy spread, girth size, and quality of the trees predicted the tree selection of the heronry birds in urban environments. Therefore, we recommend proper management and notification of the identified nesting trees as protected sites for the conservation of herorny birds.

关键词： avenue trees heronry management urban ecosystem

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Understanding the drivers of woody plant diversity in urban parks in a snow climate city of China

引用

Journal of Forestry Research 2023年第4期34卷 1021-1032页

作者： Zijun Ma Peng Zhang Nanlin Hu Guodong Wang Yulin Dong Yujie Guo Chengcong Wang Yao Fu Zhibin Ren Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China School of Geography and Engineering of Land Resources Yuxi Normal UniversityYuxi 653100People’s Republic of China

urban parks are an important part of urban ecosystems and play an important role in biodiversity ***,it is still unclear how park characteristics aff ect plant diversity which could hinder the conservation of urban biodiversity due to the ineff ective design of urban *** diversity of woody plants in 33 parks of Changchun,China,was measured with plot measurements and linked with urban park characteristics(e.g.,size and age of the park)to uncover the relationship between *** results show that urban woody plant species were abundant,with 98 species belonging to 51 genera and 26 families in the snow climate city of *** variation in woody plant diversity was largely explained by internal patch characteristics(e.g.,size,age,shape),and external factors surrounding the park(e.g.,land use type and socioeconomic level)accounted for only 16.0%in our *** internal patch characteristics,older urban parks with larger areas demonstrated a richer level of plant diversity and increased nonlinearly with increasing park *** threshold size signifi cantly aff ecting plant diversity variation was approximately 30 *** diversity had positive linear relationships with the ages of urban parks,supporting the legacy eff *** addition,woody plant diversity nonlinearly decreased with increasing park shape index,which suggested that the plant diversity could also be increased by optimizing the park *** the external factors surrounding parks,the spatial distribution of woody plant diversity varied greatly from the urban center to the *** prices around the park had positive linear relationships with woody plant diversity in parks,supporting the luxury eff ***,building and road proportions,and green space proportion had no relationship with plant diversity in *** study can provide a robust reference for enriching plant diversity in urban parks,thus improving the development of urban sustainable cities.

关键词： urban ecosystem urban biodiversity urban park Remote sensing Field measurement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rapid assessment checklist for green roof ecosystem services in Bangkok,Thailand

引用

Ecological Processes 2020年第1期9卷 205-221页

作者： Rattanapan Phoomirat Nipada Ruankaew Disyatat Tae Yoon Park Dong Kun Lee Pongchai Dumrongrojwatthana Biological Sciences Program Faculty of ScienceChulalongkorn UniversityBangkok 10330Thailand Department of Biology Faculty of ScienceChulalongkorn UniversityBangkok 10330Thailand Graduate School of Education Yonsei UniversitySeoul 03722Republic of Korea Department of Landscape Architecture and Rural System Engineering Seoul National UniversitySeoul 08826Republic of Korea

Background:A green roof is a man-made ecosystem created when a rooftop is covered with substrate and *** green roof ecosystems(GREs)are able to provide ecosystem services,there is currently no assessment tool available to specifically evaluate ***,the aim of this study was to develop a rapid assessment checklist(RAC)to assess GRE services(GRES),which was developed and tested on 10 green roofs in Bangkok,***:The RAC consisted of 46 proxy indicators(33 qualitative and 13 quantitative indicators)encompassing various aspects of *** GRES values or scores varied according to structural differences in the green *** average score(from a maximum of 100)of total ecosystem services was 61±7,which could be inferred as a good performance in ecosystem service *** highest scores were obtained from the regulating services at 68±*** lowest average score was 53±11 from the provisioning ***:The RAC was able to evaluate the levels of GRES provided by the selected green roofs,enabling the meaningful comparison of their potential capability to provide ***,this RAC could be an innovative tool for evaluation of four categories of GRES.

关键词： Vegetated roof Evaluation Composite indicator urban ecosystem ecosystem management

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Big data and the future of urban ecology:From the concept to results

引用

Science China Earth Sciences 2020年第10期63卷 1443-1456页

作者： Jun YANG Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Tsinghua urban Institute Beijing 100084China

urban ecology is experiencing the third paradigm *** understand the interactions between the social system and the natural system in the city across time and space,and to provide theories and solutions to sustainable urban development are essential tasks for urban ecology in the next *** data can play a crucial role in future urban ecology studies due to the interdisciplinary nature of urban ecology,the fact that cities are factories of big data,and the new insights gained by using big data in ***,to translate big data from a concept to research results that can guide planning,policymaking,and management of cities,we need to overcome multiple challenges existing in the theoretical framework,data acquisition,and analytic *** ecologists should enhance the collaboration with the data scientists to increase the application of big data in studies of urban biodiversity,urban ecosystem services and human wellbeing,and processes of urban ecosystems.

关键词： Big data Social media Research paradigm Sustainable development urban ecosystem

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dispersal of invasive Phytolacca americana seeds by birds in an urban garden in China

引用

Integrative Zoology 2017年第1期12卷 26-31页

作者： Ning LI Wen YANG Shubo FANG Xinhai LI Zhanchen LIU Xin LENG Shuqing AN School of Life Science Nanjing UniversityNanjingChina Fisheries and Life Science School Shanghai Ocean UniversityShanghaiChina Institute of Zoology Chinese Academy of SciencesBeijingChina College of Biology and the Environment Nanjing Forestry UniversityNanjingChina

Although seed dispersal is a key process determining the regeneration and spread of invasive plant populations,few studies have explicitly addressed the link between dispersal vector behavior and seedling recruitment to gain insight into the invasion process within an urban garden *** evaluated the role of bird vectors in the dispersal of pokeweed(Phytolacca americana),a North American herb that is invasive in urban gardens in *** *** attracted both generalist and specialist bird species that fed on and dispersed its *** generalist species Pycnonotus sinensis and Urocissa erythrorhyncha were the most frequent *** numbers of *** were strongly associated with the perching behavior of frugivorous *** newly recruited bird species use seedling-safe perching sites,the *** will regenerate faster,which would enhance its invasive *** on our observations,we conclude that the 2 main bird vectors,*** and ***,provide potential effective dispersal agents for *** results highlight the role of native birds in seed dispersal of invasive plants in urban gardens.

关键词： dispersal patterns frugivorous bird Phytolacca americana seed dispersal urban ecosystem

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The spatial-temporal pattern and influencing factors of negative air ions in urban forests, Shanghai, China

引用

Journal of Forestry Research 2014年第4期25卷 847-856页

作者： Hong Liang Xiaoshuang Chen Junguang Yin Liangjun Da Department of Environmental Science East China Normal University Tiantong Forest Ecosystem National Research Station and Shanghai Key Laboratory for Ecology of Urbanization Process and Eco-restoration College of Landscape Architecture and Forestry Qingdao Agricultural University Kunshan Municipal Environmental Protection Bureau

Negative air ions are natural components of the air we breathe Forests are the main continuous natural source of negative air ions （NAI）. The spatio-temporal patterns of negative air ions were explored in Shanghai, based on monthly monitoring in 15 parks from March 2009 to February 2010. In each park, sampling sites were selected in forests and open spaces. The annual variation in negative air ion concentrations （NAIC） showed peak values from June to October and minimum values from December to January. NAIC were highest in summer and autumn, intermediate in spring, and lowest in winter. During spring and summer, NAIC in open spaces were significantly higher in rural areas than those in suburban areas. However, there were no significant differences in NAIC at forest sites among seasons. For open spaces, total suspended particles （TSP） were the dominant determining factor of NAIC in sum- mer, and air temperature and air humidity were the dominant determining factors of NAIC in spring, which were tightly correlated with Shanghai＇s ongoing urbanization and its impacts on the environment. R is suggested that urbanization could induce variation in NAIC along the urban-rural gradient, but that may not change the temporal variation pattern. Fur- thermore, the effects of urbanization on NAIC were limited in non-vegetated or less-vegetated sites, such as open spaces, but not in well-vegetated areas, such as urban forests. Therefore, we suggest that urban greening, especially urban forest, has significant resistance to theeffect of urbanization on NAIC.

关键词： negative air ion concentration spatial-temporal pattern urbanization urban ecosystem urban greening

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ecological assessment of cities-procedure and a case study

引用

Journal of Environmental Sciences 1990年第1期2卷 1-15页

作者： Xu Songling and Guo JingnanInstitute of Ecology,Chinese Research Acderny of Environmental Sciences,Beijing 100012,China

This paper discusses the scientific background and content of the ecological assessment of cities, and takes Boda, a new town in Xinjiang province, China, as a case study.

关键词： ecological assessment urban ecosystem ecological countermeasure.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：