Does an Urban Wilderness Promote Gentrification? A Case Study from Knoxville, Tennessee, USA

The Knoxville Urban Wilderness (KUW) is a successful example of a growing global movement to utilize vacant urban land as many cities “de-urbanize”. A key question is whether this particular kind of green space promotes social inequality via green gentrification. Our analysis shows how the KUW has affected nearby home prices. Socioeconomic data including income, educational attainment, and race is also presented to explore the possibility of gentrification in South Knoxville. Our findings do not support strong evidence of gentrification, which implies that lower-income households are benefiting from advances in environmental amenities. Other households in specific areas are benefiting from both increases in home values and from expansions of the KUW. These are encouraging results for urban planning efforts that seek to utilize large areas of vacant urban land while also having positive social and economic impacts.

Impacts of Urban Expansion on the Loss and Fragmentation of Cropland in the Major Grain Production Areas of China

The continuous expansion of urban land has led to massive encroachment upon cropland. To examine the impacts of urban expansion on the loss and fragmentation of cropland in China’s nine major grain production areas (MGPAs), we used standard deviation ellipse, land use transfer matrix, land use dynamic degree, and landscape metric to explore the spatio-temporal evolutions, mutual transfer, and landscape patterns of cropland and urban land. The results show the following: (1) From 1995 to 2018, the areas of cropland in MGPAs showed a trend of “short-term increase—long-term decrease—short-term increase”, while that of urban land grew continuously; (2) Urban expansion is the main cause of cropland loss. The cropland area converted to urban land accounts for a large proportion (49.26%) of the total transfer of cropland to other land types, especially in the densely populated, rapidly urbanizing and industrializing Taihu Lake Plain, Jianghuai Region, and Pearl River Delta; (3) In most MGPAs, urban expansion has led to fragmentation of cropland, especially in the Pearl River Delta, as indicated by the significant change of patch density. However, in the Sanjiang Plain and Songnen Plain, a less pronounced or even reduced cropland fragmentation was observed due to the significant conversion of other land types to cropland under specific land policies. From these results, we suggest that the government should regulate the encroachment of urban land on cropland and the transfer of natural land to it, and encourage the rural land consolidation to increase the cropland.

Does Polycentric Development Improve Green Utilization Efficiency of Urban Land? An Empirical Study Based on Panel Threshold Model Approach

In the context of increasing resource and environmental constraints, measurement and determinants of green utilization efficiency of urban land (GUEUL) is currently the subject of a rapidly expanding literature. Previous research concerning determinants of GUEUL focuses primarily on effects of socio-economic conditions on GUEUL, and little attention has been devoted to impacts of spatial structure and urban development patterns. This research explores impacts of polycentric development on GUEUL of urban agglomeration (UA), using data for major UAs in China covering the period 2005–2019. GUEUL and the extent of polycentricity is measured by employing an improved directional slack-based measure (SBM) model and the rank-size distribution-based approach, respectively. The linkage between polycentric development and GUEUL is explored by estimating models of determinants of GUEUL, and the nonlinear characteristics of the relationship are investigated by employing the panel threshold model approach. The results suggest that polycentric development positively impacts GUEUL of UAs, and such effect rises with economic development levels. In addition, degree of agglomeration, economic development level and intensity of government investment in science and technology is found to be positively related to GUEUL. The empirical results have significant implications for improving GUEUL through formulating and implementing regional and urban policies.

Spatial Pattern of Functional Urban Land Conversion and Expansion under Rapid Urbanization: A Case Study of Changchun, China

As populations continue to be concentrated in cities, the world will become entirely urbanized, and urban space is undergoing a drastic evolution. Understanding the spatial pattern of conversion and expansion of functional urban land, in the context of rapid urbanization, helps us to grasp the trajectories of urban spatial evolution in greater depth from a theoretical and practical level. Using the ESRI ArcGIS 9.3 software platform, methods, such as overlay analysis, transition matrix, and kernel density estimation, were used in order to analyze the spatiotemporal characteristics of different types of functional urban land conversion and expansion in the central city of Changchun. The results show that different types of functional urban land were often expanded and replaced, and the urban spatial structure was constantly evolving. The conversion and expansion of functional urban land show similar characteristics to concentric zone and sector modes and show dynamic changes in different concentric circles and directions at different periods. Our method can accurately identify the different types of functional urban land, and also explore the evolutionary trajectory of urban spatial structure. This study will help to coordinate the development of different functional urban spaces and to optimize the urban spatial structure in the future.

Normative practices of property rating in Ghana: towards improving policy on rating undeveloped urban lands in secondary cities

PurposeThe paper examined how local authorities have attempted to rate undeveloped land as a means of mobilising revenues and the challenges associated with implementing this policy guideline. It focused on current practices in terms of policy and administration, the availability of undeveloped urban land, its revenue potential, and ways to improve policy for local land taxation.Design/methodology/approachDrawing from the mixed-method approach both qualitative and quantitative data were collected. Officials of the Wa Municipal Assembly, Lands Commission, Land Use and Spatial Planning Authority were purposely selected based on their knowledge and the roles they play in property rating practice. They were interviewed to understand their perceptions and views on rating undeveloped lands. Stratified proportionate and simple random sampling methods were used to select respondents. The respondents included land and landed property owners in three selected neighbourhoods.FindingsThe paper found that there was the prevalence of undeveloped lands mainly held by speculators and individuals constrained by financial challenges to develop their parcels. The Wa Municipal Assembly is unable to implement the policy guideline on charging rent on undeveloped lands due to lack of adequate information and generally unwillingness to implement this provision. Besides, the current guideline is too prohibitive and cannot be implemented in its current form. However, there is a window of opportunity for the Assembly to build data on undeveloped lands and moderately begin the implementation of the policy guideline.Practical implicationsUrban growth in Ghana is characterised by leapfrog development with many patches of undeveloped land in and around cities. The property taxation policies largely do not focus on undeveloped land or unimproved site value. In Ghana, property rate policy on the tax base excludes undeveloped land. However, government policy guidelines prescribe the charging of rent on these lands by local authorities. This paper provides a comprehensive discussion on the revenue potential of undeveloped urban land and why local government authorities have not been able to harness this potential. The paper has therefore recommended ways local authorities can use to mobilise revenue from undeveloped urban land.Originality/valueThere is limited research in rating undeveloped urban land especially looking at it from the perspective of policy and implementation as well as current practices. The paper shed light on the prevalence of undeveloped urban land and the guidelines that exist help local governments mobilise revenue from these lands. It contributes to the understanding that local government can harness the revenue potential of undeveloped land if policy design and implemented regarding these lands is enhanced. The paper also provides a good background and framework for further studies.