Urban Construction Land Expansion Research Articles

The Research on Land-Use Change and Ecological Environment Effect of Urban Landscape in China

The rapid expansion of urban construction land has become the major characteristic of urban land-use change in China today. Meanwhile, the rapid urbanization process has led to the great changes of urban landscape in China, and it also has had certain impacts on environmental factors such as climate, soil, hydrology, biodiversity, etc., then it has made the overall ecological environment deteriorated. This study is based on the summary and analysis of research on land-use change and ecological environment effect of urban landscape in recent 20 years in China, and it aims at providing scientific bases and theoretical supports for the planning and construction of urban landscape, the sustainable land-use of city and the protection of ecological environment in China.

基于GIS的沿海地区生态安全时空测度与演变研究——以大连市瓦房店为例

In this study,taking the Landsat TM remote sensing images( track No. 120 /32,120 /33) of Wafangdian County-level City in 2000,2005 and 2010 as the data sources,the coastal ecological security evaluation system was established on the basis of landscape pattern analysis and pressure-state-response( P-S-R) framework. Grid database of coastal eco-security assessment was created by quantitative multi-source data with GIS grid technology. Eco-security status was estimated by the use of the weighted-fuzzy membership degree method. Temporal and spatial evolution of eco-security pattern was analyzed through spatial statistical methods in order to reveal evolution features of coastal region ecological safety as well. The results showed as follows: 1) The ecological safety index of Wafangdian County-level City from 2000 to 2010 was 0. 4636,0. 3878 and 0. 4636,respectively,which demonstrated eco-security situation had a slight improvement after deterioration,but we should pay more attention to prefect the ecological status in western coastal district. 2) Moran's I from2000 to 2010 was 0. 9015,0. 8738 and 0. 8703,respectively,which indicated there was a significant correlation of spatial evolution in the space. The characteristic of ecological safety pattern was that areas with high value was inclined to be close to the regions of better ecological eco-security status,while the low degree of eco-security status presented adverse tendency,which performed extremely obvious from 2000 to 2005. 3) The nuggets of eco-security index in Wafangdian County-level City was 0. 0030,0. 0007 and 0. 000903,respectively,which showed the non-structural factors played an everincreasing role in spatial distribution of ecological safety in the study area,which was consistent with the actual conditions of urban construction land expansion and frequent human activities in the past decade. The change about value of C0/( C0+C) decreased as the speed increased initially and decreased afterwards,which reflected the impact of non-structural factors on the space differentiation of ecological security had experienced a consistent change trend. With the implementation of the land policy and management of Dalian City,the influence from non-structural factors such as urban construction and human activities on eco-security evolution has been cut down since 2005.

Carbon Emission and Urban Construction Land Expansion in China: Evidence from Co-Integration Tests and Impulse Response Model

Using co-integration analysis, Granger causality test, and impulse response analysis in an integrated way, this paper makes empirical study of the impact on China’s carbon emission by its urban construction land expansion. The result shows that there is a long-run equilibrium relationship between carbon emission and urban construction land expansion in China, with the latter being the Granger cause of the increase in carbon emission. However, the impact process shows a lagging nature. The impact effect is not so evident in a short term, but is rather significant in a long term (five to ten years). To reduce its carbon emission, China should optimize its urban development mode and control the scale of urban development reasonably, especially focusing on the economical and intensive use of land and upgrading of industrial structure, so as to reduce energy consumption by its urban expansion, check excessive increase in carbon emission, and promote the sustainable urbanization.

Baotou Urban Construction Land Expansion and Optimization Strategy Research

In Baotou, along with the rapid economic development in the recent 10 years, the construction speed of the City is getting more and more quickly, and the urban land scale is expanding rapidly. At the same time, the restrictions derived from the land resources are also getting stronger and stronger, which results in the even more obvious contradiction between the differentiated requirements from the urban development and proper land usage. The paper analyzes the scale of Baotou urban construction land expansion and the transformation rules of land-using structure in the recent 10 years, and makes conclusions upon the characteristics of urban land expansion. The paper aims to present an optimization strategy of proper urban construction land expansion.

Gradient Analysis of Urban Construction Land Expansion in the Chongqing Urban Area of China

Urban construction land-use expansion is an important topic in the field of land-use change research. In the present study, the temporal and spatial changes of urban construction land use in the Chongqing urban area are analyzed, based on land-use maps from 1975, 1987, 1995, 2000, and 2010. Using gradient analysis, the study area was divided into nine buffer zones and eight quadrants. The study analyzed the compactness of the urban construction land in different buffer ranges and different directions, and further fitted the compactness degrees and different gradients. The results indicated that there was a rapid growth of urban construction land use in the Chongqing urban area in the period of 2000–2010, and the land use for urban construction sharply increased at an average annual rate of 5.69%. The expansion pattern showed a spatial mode of one center and multiple subcenters. Furthermore, although the key regions (the fastest-growing regions of urban construction land) of urban expansion showed higher compactness degree than the nonkey regions (the slowest-growing regions of urban construction land) of urban expansion, the compactness degrees were decreasing in the key regions but increasing in the nonkey regions. Specifically, the urban construction land had three highly compact zones in the buffer radius gradient—zones of radius 5, 25, and 40 km—and the compactness degrees gradually increased. When analyzed by the quadrant gradient of buffers, quadrants 45–90° (WNW), 90–135° (WSW), and 315–360° (NNE) were the key regions of urban expansion, and quadrants 225–270° (ESE) and 270–315° (ENE) were the nonkey regions. In addition, the change in compactness degree was highly correlated with changes in the buffer radius and quadrant azimuth.

A Study on Urban Construction Land Expansion Mode in Fuzhou City

This paper took Fuzhou urban area as an example，which is provincial capital city of Fujian province. Data on the variation of construction land in Fuzhou were obtained by employing the statistic and analytic function of GIS on the spatial data from remote sensing image data in different periods. A new method based on the principle of convex hull was used in this paper, which is to define the types of urban land expansion by the proportion of the area located inside or outside the convex hull of a city’s outline. The results showed that, during the last 20 years，the area of construction land had almost doubled, from 84.1 km2 to 190.3 km2. Urban construction land expanded to 64.2 km2 with an average annual growth rate of 4.84%, which was more obvious during the 1988-2000 periods. On the whole, urban construction land expansion of Fuzhou city belonged to the ‘extension’ type, complementary to ‘infilling’ type. There are three patterns namely 1inear development, sprawl expansion and leapfrog expansion. Previous period, the city spread along two main traffic quickly in the north-south and east-west, latter period was the slow expansion of low-density infill.

基于景观安全格局的建设用地管制分区

旨在探索如何构建一种生态与经济发展兼顾的建设用地管制分区工作体系。以扬州市为例,选择防洪、水土保持、生物保护、乡土文化保护和游憩安全5个要素构建区域多层次综合生态安全格局,利用神经网络CA模型模拟无生态约束下的区域城镇建设用地扩展格局,将二者耦合得到优先建设区、有条件建设区、调整建设区、限制建设区和禁止建设区,并为每类管制区编制相应的管制规则。结果表明:①利用景观安全格局与城镇建设用地扩展格局耦合来进行建设用地管制区划分,优先考虑生态环境保护,再进行建设用地的安排,实现了生态与经济的双赢;②通过调整建设区的划定,为地方政府提供了新增建设用地适宜调整的区域,在建设用地管制的基础上,给予地方政府充分的自主权。;In recent years, although rapid development of industrialization and urbanization stimulated China's economic growth, uncontrolled urban expansion occupied a large number of ecological land and caused a series problems on urban ecological systems. Due to those problems are constraining China's sustainable urban system development, safeguarding the fragile urban ecological environments is becoming a central issue. Ecological security pattern can support the healthy development of natural ecosystems in a region. How to develop ecological security pattern in urban areas is increasingly important. Landscape security pattern which take interaction between landscape process and pattern as the core, can be used to build ecological security pattern for urban areas. The research area of this paper is Yangzhou that located in the middle of Jiangsu Province. After a decade of rapid urbanization process, ecological land and construction land remain contradictory in research region. Resources and environmental problems caused by unscientific planning are becoming a bottleneck which restricting the regional economy. Using Yangzhou as a case study, this paper explores how to create a practical zoning system for regulating construction land that balances ecological and economic development. The study design uses a framework of landscape security pattern theory and cellular automata theory. First, five landscape security patterns are built, for flood management, oil and water conservation, biodiversity conservation, cultural heritage protection and safeguarding recreation areas. Second, the regional urban construction land expansion pattern in the target year is simulated without ecological constraints with the aid of the neural network cellular automata model. Finally, according to the ecological protection and socio-economic development demands of the study area, regional landscape security pattern and urban construction land expansion pattern are combined to identify priority construction zones, flexible construction zones, conditional construction zones, restricted construction zones and forbidden construction zones. In the study area, the five construction zones occupied 2.88%, 4.81%, 1.05%, 90.07%, 1.19% of the total land. Control rules are established for each type of control zone based on its nature and landscape components. In priority construction zones, land development for urban construction is the priority use. In flexible construction zones, adjustment of new construction land is the priority use. In conditional construction zones, protection of farmland and establishment of green activities and local cultural experience corridors are prioritized. In restricted construction zones, the use of land for urban construction is carefully restricted, while the construction of infrastructure capable of protecting the natural and cultural landscape is encouraged. In forbidden construction zones, the focus is on protecting biological habitats and local culture, the development of construction is prohibited in principle. The results show that this practical zoning system, which values construction land over ecological land, can significantly reduce ecological pressure caused by construction and maintain the stability of urban ecological systems. Using regional landscape security patterns and urban construction land expansion patterns to divide construction land into control zones integrates ecological priorities into zoning and achieves an ecological and economic win-win. The system not only caters to present economic needs, but also supports sustainable economic development. Furthermore, flexible construction zones also give local government space to adjust new construction land. In the planning period, flexible new construction land accounted for 43.76% of all land allocated for construction. Government can freely provide new construction land in these zones according to demands. This practical system provides full autonomy to local government in construction matters and effectively combines control and self-management.

Study on the Urban Space Expansion Based on GIS and RS Techniques

Based on the two Landsat TM images in 1988 and 2007, the urban construction land are extracted through GIS and RS techniques on the basis of Remote sensing images classifications, and the quantity and spatial distribution characteristics of urban construction land are analyzed. The results of the study show that the north and northeast direction are the leading orientation of urban construction land expansion, account for 45% of total expansion area. Farm land and forest are the transformation of the source of urban construction land expansion, and account for 27.17% and 23.74%, respectively. The main driving force of urban land use changes are including economic progress and population, terrain and administrative factors, especially the comprehensive effect among all these factors.

Study on Space Model of Urban Expansion

With GIS spatial application model, from the angles of space developing and changing, explore the motion and change rules of urban development in the process of urbanization, and improve scientific nature and accuracy of forecast. To analyze the characteristics and their driving forces of changes in urban construction land and urban expansion space, first we have explored space model of urban expansion theoretically, then made some research combining the examples of urban spatial and temporal changes in Luoyang City. Study the laws of urban expansion from the angles of temporal and spatial variation with GIS space analysis model, thereby explore the internal mechanism of urban spatial variation, which can be provided with better research efficiency.

Analyzing and Pondering on the Regulation of Urban Construction Land Expansion

abstract Along with the economic development and the acceleration of urbanization, urban construction land expands rapidly in China, and has resulted in a series of socio-economic problems. This article summarized the major points of controlling the unchecked and rash expansion of construction land in the academic circle, and analyzed the problems of regulating the expansion of construction land from three aspects. First, this article analyzed the relationships between socio-economic development and urbanization from the historical viewpoints, and pointed out that the expansion of construction land is a historical phenomenon which will be surely appeared in the development of human race. Second, the authors utilized two-sector model to analyze the importance of urbanization in the socio-economic development from the academic angles. At last, the authors utilize four-quadrant model and bidrent curve model to analyze the influence that brought by the strict control of construction land expansion. Through analysis, this article drew some conclusions. First, the expansion of construction land is a phenomenon which will surely appear in the social development. It is impossible to accomplish the national modernization on the basis of dualistic structure between urban and rural areas. Second, under the function of rent gradient gap, strict control of construction land expansion will not only obtain the anticipated effects, but also cause a series of socio-economic problems, such as land-levying contradiction, the appearance of limited property right house, and being dependant on lease instead of expropriation. Third, unreasonable policies and governmental behaviors are the roots of the unchecked and rash expansion of urban construction land. Based on these conclusions, this article proposed that three transformations should be realized to regulate the unchecked and rash expansion of construction land: transfers from quantity regulation to quality regulation, from direct regulation to indirect regulation, and from single-measure regulation to multi-measures regulation.