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Impacts of Transportation Arteries on Land Use Patterns in Urbanrural Fringe: A Comparative gradient analysis of Qixia District, Nanjing City, China

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Chinese Geographical Science 2013年第3期23卷 378-388页

作者： ZHANG Runsen PU Lijie ZHU Ming School of Geographic and Oceanographic Sciences Nanjing University Key Laboratory of Land Use Ministry of Land and Resources

Integrated transportation and land use studies are of major interest to planners because they consider the interaction between transportation development and land use change. Quantifying the impact of transport infrastructure on land use change is necessary for evaluating the role of transportation development in the process of land use and land cover change in the urban-rural fringe. Taking Qixia District of Nanjing City, Jiangsu Province, China as a typical urban-rural fringe area, this paper analyzes the patterns and charac- teristics of land use change along three major transportation arteries using land use data from 2000 and 2008. We examine the spatial differentiation and gradient of land use pattern around railway, expressway, and highway corridors to investigate whether land use change in the urban-rural fringe is related to distance from transportation arteries and to clarify the varying impacts of different forms of transport infrastructure on land use patterns. We find that construction land generally tends to be located close to major transportation arteries, and that railways have the most obvious influence on land use change in the urban-rural fringe, while the impact of expressways was not significant. We conclude that there exists a causal relationship between the presence of transportation arteries and land use change in the urban-rural fringe, but this relationship varies across different types of linear transnort infrastrncnlre.

关键词： land use change transportation arteries gradient analysis land use dynamic degree urban-rural fringe

SPATIAL gradient analysis OF URBAN GREEN SPACES COMBINED WITH LANDSCAPE METRICS IN JINAN CITY OF CHINA

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Chinese Geographical Science 2005年第3期15卷 254-261页

作者： KONG Fan-hua Nobukazu NAKAGOSHI YIN Hai-wei Akira KIKUCHI Graduate School for International Development and Cooperation Hiroshima University Higashi-Hiroshima 739-8529 Japan Department of Urban and Resources Sciences Nanjing University Nanjing 210093 P. R. China

Urban green spaces have been arisen growing concern responded to the social and environmental costs of urban sprawl. A wide range of planning and policies has been and/or will be designed to protect urban green spaces and optimize their spatial pattern. A better design or planning of urban green space can make a major contribution to quality of environment and urban life, and furthermore can decide whether we can have a sustainable development in the urban area. Information about the status quo of urban green spaces can help planners design more effectively. However, how to quantify and capture such information will be the essential question we face. In this paper, to quantify the urban green space, a new method comprising gradient analysis, landscape metrics and GIS was developed through a case of Jinan City. The results demonstrate: 1) the gradient analysis is a valid and reliable instrument to quantify the urban green space spatial pattern precisely; 2) using moving window, explicit landscape metrics were spatially realized. Compared with quantifying metrics in the entire landscape, it would be better to link pattern with process and establish an important basis for analyzing the ecological and socioeconomic functions of green spaces.

关键词： urban green space spatial pattern gradient analysis landscape metrics GIS Jinan City

A gradient analysis on urban sprawl and urban landscape pattern between 1985 and 2000 in the Pearl River Delta, China

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Frontiers of Earth Science 2018年第4期12卷 791-807页

作者： Erfu DAI Zhuo WU Xiaodian DU Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Beijing No.65Middle School Beijing 100006China

Urbanization is an irreversible trend worldwide, especially in rapidly developing China. Accelerated urbanization has resulted in rapid urban sprawl and urban landscape pattern changes. Quantifying the spatiotemporal dynamics of urban land use and landscape pattern not only can reveal the characteristics of social transfer and economic development, but also can provide insights into the driving mechanisms of land use changes. In this study, we integrated remote sensing (RS), geographic information system (GIS), landscape metrics, and gradient analysis to quantitatively compare the spatiotemporal dynamics of land use, urban sprawl, and landscape pattern for nine cities in the Pearl River Delta from 1985‒2000. For the whole study region, urbanization was obvious. The results show an increase in urban buildup land and shrinkage of cropland in the Pearl River Delta. However, the nine cities differed greatly in terms of the process and magnitude of urban sprawl for both the spatial and temporal dimensions. This was most evident for the cities of Guangzhou and Shenzhen. gradient analysis on urban landscape changes could deepen understanding of the stages of urban development and provide a scientific foundation for future urban planning and land management strategies in China.

关键词： urbanization urban sprawl landscape pattern gradient analysis Pearl River Delta in China

gradient analysis of Urbanization Pattern Based on Class-level Landscape Metrics for Shanghai Region

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Journal of Donghua University(English Edition) 2005年第5期22卷 90-95页

作者：黄震张利权陈亮 College of Environmental Science & Engineering Donghua University 200051 State Key Laboratory of Estuarine and Coastal Research East China Normal University

The spatial pattern of urbanization in the Shanghai metropolitan area is quantified with GIS-based land use data set and gradient analysis of landscape metrics. A number of landscape metrics were computed along a 64 Ion long and 6 km wide west-east transect and another 66 km long and 6 km wide south-north transect. The results of transect analysis with class-level metrics showed that the spatial pattern of urbanization could be reliably quantified using landscape metrics with a gradient analysis approach, and the location of the urbanization center could be identified precisely and consistently with multiple indices of the landscape metrics used in this study. Different land use types exhibited distinctive, but not necessarily unique, spatial signatures that were dependent on specific landscape metrics. These results seemed to characterize the urban core of the Shanghai metropolitan area rather accurately and precisely.. Agriculture patches were abundant and less fragmented; the urban land use types were extensive, having many small patches and highly fragmented.

关键词： urbanization gradient analysis landscape pattern class-level metrics

A novel weld-pool-length monitoring method based on pixel analysis in plasma arc additive manufacturing

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Advances in Manufacturing 2024年第2期12卷 335-348页

作者： Bao-Ri Zhang Yong-Hua Shi Bionic Robot Research Department Ji Hua LaboratoryFoshan528200GuangdongPeople’s Republic of China Guangdong Provincial Engineering Research Center for Special Welding Technology and Equipment School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou510640People’s Republic of China

The real-time monitoring of the weld pool during deposition is important for automatic control in plasma arc additive *** obtain a high deposition accuracy,it is essential to maintain a stable weld pool *** this study,a novel passive visual method is proposed to measure the weld pool *** the proposed method,the image quality was improved by designing a special visual system that employed an endoscope and a *** also includes pixel brightness-based and gradient-based algorithms that can adaptively detect feature points at the boundary when the weld pool geometry *** algorithm can also be applied to materials with different solidification *** was performed to measure the real weld pool length in world coordinates,and outlier rejection was performed to increase the accuracy of the ***,tests were carried out on the intersection component,and the results showed that the proposed method performed well in tracking the changing weld pool length and was applicable to the real-time monitoring of different types of materials.

关键词： Plasma arc additive manufacturing(PAAM) Weld pool geometry gradient analysis Real-time detection

Mountain Pastures and Grasslands in the SW Tien Shan,Kyrgyzstan-Floristic Patterns,Environmental gradients,Phytogeography,and Grazing Impact

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Journal of Mountain Science 2011年第3期8卷 363-373页

作者： BORCHARDT Peter SCHICKHOFF Udo SCHEITWEILER Sabrina KULIKOV Maksim University of Hamburg Institute of Geography

Vast grasslands are found in the walnut-fruit forest region of southern Kyrgyzstan,Middle *** above the worldwide unique walnutfruit forests and used for grazing,they play a pivotal role in the mixed mountain agriculture of local ***,these pastures are subject to an increasing utilization pressure reflecting the changing political and social conditions in the transformation process from a Soviet republic to an independent state.A first detailed analysis of mountain pasture vegetation in the Ferghana Range answers the following questions:What are the main plant community types among Kyrgyzstan's mountain pastures? What are the main environmental gradients that shape their species composition? Which phytogeographical distribution types are predominant? How does grazing affect community composition and species richness in these grasslands? Species composition was classified by cluster analysis;underlying environmental gradients were explored using DCA.A dataset of 395 relevés was used for classification,and a subset of 79 relevés was used in a DCA to analyze the correlation between vegetation,environment,and grazing *** investigated pastures were classified into four distinctive plant *** site factors altitude,heat load,inclination and grazing impact were found to be the major determinants of the vegetation pattern.A significant overlap between floristic composition and structural and spatial properties was *** majority of the species pool consisted of Middle Asian endemics and Eurosiberian ***,disturbance-tolerant species played a significant role with respect to species composition and coverage of the herbaceous layer in vast areas of southern Kyrgyzstan's mountain *** general,an intense grazing impact is clearly reflected by both species composition and structural variables of plant *** highly diverse and unique ecosystem is modified by an increasing utilization *** order to ma

关键词： Central Asia Classification Endemics gradient analysis Grazing impact Middle Asia Pasture Management Ruderals Transformation Process Walnut-fruit forest.

Exclusion effects on vegetation characteristics and their correlation to soil factors in the semi-arid rangeland of Mu Us Sandland,China

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Frontiers in Biology 2007年第2期2卷 210-217页

作者： YANG Xiaohui ZHANG Kebin HOU Ruiping CI Longjun Research Institute of Forestry Chinese Academy of ForestryBeijing 100091China Key Laboratory of Tree Breeding and Cultivation State Forestry AdministrationBeijing 100091China College of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China

Exclusion has been applied as a main measure for re-vegetation all over the *** paper,by comparing the results of year-round exclusion,seasonal exclusion,and non-exclusion,quantified the vegetation variations under three different exclusion measures and their correlation to soil *** analysis results for community species component and plant diversity using multi-response permutation procedures(MRPPs)showed that exclusion did change the species com ponent and increase plant diversity remarkably,while the period of exclusion had no significant influence on these two community *** indicator species analysis and calculation of similarity indices indicated that community for year-round exclusion were becoming xerophytization and unpalatability,and showed highly spatial heterogeneity of plant species distribution,whereas community for seasonal exclusion was under stable non-equilibrium *** correspondence analysis(DCA)and detrend canonical correspondence analysis(DCCA)results of relationship between plant species and soil variables demonstrated that soil moisture was a controlling factor for plant species component,microbiotic soil crust cover,soil organic matter,and soil bulk density had significant effects on soil moisture,among which microbiotic soil crust was a leading factor owing to its limitation to rainfall infiltration on the one hand,and its constraints to entrance of herbaceous seeds into soil or to germination of soil seeds on the other *** a result of long-term removal of animal grazing,crust kept intact in year-round exclusion community,which was a main reason of community *** was also obvious from ordination results that some important environmental factors,such as tempo-spatial change of rainfall and corresponding tempo-spatial change of soil moisture,were neglected during direct gradient *** addition,biodiversity was close related to soil nutrients as well as to soil moisture condition(soil

关键词： exclusion treatments vegetation variation soil factors biodiversity multi-response permutation procedures gradient analysis

The Heat Island Effect Response to the Urban Landscape Pattern of Haikou based on the“Source-Sink”Theory

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Journal of Resources and Ecology 2022年第2期13卷 257-269页

作者： LI Yujie FU Hui Faculty of Civil and Environmental Engineering Hunan University of Science and EngineeringYongzhouHunan 425199China Forestry College Hainan UniversityHaikouHainan Province 570228China

The Landsat images of the 2000,2005,2010,2015,2018 are selected as the data source to retrieve land cover and surface temperature *** contribution of Sink-Source landscape pattern to the heat island and its ecological effects on urban and rural gradient were analyzed by using Heat Index(HI),Sink and Source Landscape Contribution(CI_(sink),CI_(source))and Landscape Effect Index(LI)in *** results show that the heat island is concentrated on the West Coast,and in the central urban and Jiangdong New Area;the HI shows a pattern of decreasing value with the following land types:“Bare land>Artificial surface﹥Source landscape>Shrub grassland>Farmland>Sink landscape>Woodland>Water body”.In the central city section,the CI_(sink) and CI_(source) are relatively large in these five *** LI decreases rapidly along the urban-rural gradient,promoting the Urban Heat Island(UHI)to a large *** contrast,the suburban area contributes to a lesser ***,the LI fluctuates,the proportion of mitigating UHI is large,and there is a second peak outside the city *** existing Source-Sink Landscape contributes the most to UHI in the central urban area,and this contribution decreases along the urban-rural *** the continuous expansion of city-town areas,the proportion of Sink areas has increased along the gradient,and the proportion of Source areas has subsequently declined,resulting in the spatial transfer and diffusion of ***,a UHI mitigation strategy based on the theory of regional landscape systems is proposed here.

关键词： landscape pattern Urban Heat Island gradient analysis “Source-Sink”Theory Haikou

analysis on Urbanization Phases Using Landscape Metrics along Urban-rural Transects: A Case Study of Zhangjiagang, China

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Analysis on Urbanization Phases Using Landscape Metrics alon...