Supply Area Research Articles

Retrospective analysis of image characteristics of 76 cases of cerebral vascular fenestrations.

This study aims to summarize the clinical and imaging features of cerebral vascular fenestration and to explore the association between cerebral vascular fenestration and cerebral infarction and aneurysm. The computed tomography angiography (CTA), magnetic resonance angiography (MRA), and digital subtraction angiography (DSA) imaging data of 76 cases of cerebral vascular fenestration from January 2021 and December 2021 in the Yantai Yuhuangding Hospital Affiliated to Qingdao University were analyzed. The general information was described. The location, morphology, and size of cerebral vascular fenestration were described. The association between cerebral vascular fenestration and infarction and aneurysm was analyzed. Among 76 patients, a total of 80 fenestrations were detected (two patients had three fenestrations), and basilar artery fenestration was the most common (28/80). The fenestration <5 mm was 43/80, 5-10 mm was 12/80, and ≥10 mm was 25/80. Moreover, 19 patients had other vascular diseases: 10 with aneurysms, 5 with moyamoya diseases, and 4 with cerebral artery dissections. Except for one aneurysm at the site of the fenestration, other aneurysms were separate from the fenestrations. In addition, 37 patients had cerebral infarctions, of which 16 had cerebral infarctions in the blood supply area of the arterial fenestration. Among these 16 patients, there was more cerebral infarction in posterior circulation than in anterior circulation. However, no statistically significant differences were detected in the risk factors between the fenestration-relevant cerebral infarctions group and the non-fenestration-relevant cerebral infarctions group. In our study, cerebral vascular fenestration occurred most frequently in the basilar artery and may be combined with other vascular diseases. Fenestration in posterior circulation may be related to cerebrovascular diseases. Nonetheless, no clear clinical relevance was observed between fenestration and cerebral infarction. Also, we did not find a definite association between fenestration and aneurysm. For fenestration patients with cerebral infarctions, long-term antiplatelet and statin therapy may be safe and effective.

Prospects for Using Wind Energy in the Western Sector of the Arctic

The aim of the study is to estimate the wind energy potential in the western sector of the Arctic and to identify possible ways for using wind resources for power and heat supply to regional consumers. The data of long-term wind velocity observation series at meteorological stations in the western sector of the Arctic were processed. Based on the obtained results, a map showing the distribution of annual average wind velocities in the coastal regions of the Barents and White Seas has been drawn; the recurrence of wind velocities has been studied, and the wind energy resources in the region have been estimated. It has been established that in the majority of coastal regions, the annual average wind velocities at a height of 10 m above the ground level are in the range 5 to 8 m/s. The highest wind intensity is observed during the winter months. The seasonal maximum of wind velocities coincides with the maximum demand for heat and electricity in the cold season, which is a favorable prerequisite for successful use of wind energy for meeting the consumers’ electricity and heat supply needs. The presented data testify the possibility of efficiently using wind power plants (WPPs) in the following three main areas: the development of systemic wind energy (operation of large wind farms as part of the power system), participation of WPPs in supplying power to autonomous consumers (joint operation with local diesel power plants), and heat supply to consumers (joint operation with boiler units). Based on the study results, promising sites have been determined for construction of large wind farms on the Kola Peninsula northern coast near the hydroelectric power plants operating as part of the Kola power system. The indicators characterizing possible joint operation of WPPs with local diesel power plants and boiler units in decentralized power supply areas have been obtained. It has been shown that the major effect from using wind energy boils down to saving expensive fossil fuel, which is delivered to consumers in the Arctic regions at high transportation costs. In the areas of decentralized power supply, the use of WPPs helps save from 20 to 70% of annual fuel consumption depending on the wind energy potential.

Optimisation of chlorinedisinfection in drinkingwater supply network

Abstract Chlorination is one of the most commonly used procedures for drinking waterdisinfection. The research aimed to soptimise the subsequent disinfection ofdrinking water with chlorine in the water supply network in the city Velenje,taking into account the applicable legislation. The gradual reduction of chlorinedosage was implemented with simultaneous monitoring of selected physico-chemical and microbiological parameters of drinking water. During the two-month period, 418 samples were taken at 22 previously defined differentsampling spots. Free chlorine values were reduced from the initial 0,18 mg/L tothe final 0,08 mg/L at the outlet, while values at some remote sampling sitesreached only 0,01 mg/L of free chlorine. Microbiological analyses of samplesshowed that the drinking water met the limit values in the regulations, despitethe low values of free chlorine. Based on the results, a modified chlorination ofdrinking water was introduced in the tested supply area, and the introduction ofa similar regime in other supply areas is being actively considered. In this way,we reduce the consumption of disinfectants and ensure the supply of qualityand healthy drinking water to consumers.

Spatiotemporal Evolution of Mountainous Ecosystem Services in an Arid Region and Its Influencing Factors: A Case Study of the Tianshan Mountains in Xinjiang

Mountainous ecosystems provide humans with multiple ecosystem services (ESs), but global changes and anthropogenic activities threaten the supply of such services in arid regions. To maintain regional ecological security and achieve ecosystem sustainability, it is quite essential to understand the spatiotemporal characteristics of mountainous ESs in arid regions and clarify the main driving factors of different ESs. Using the integrated valuation of ecosystem services and tradeoffs (InVEST) and revised universal soil-loss equation (RUSLE) models, we evaluated the ESs provided by the Tianshan Mountains of Xinjiang from 2000 to 2020. The research showed that: (i) over the 20 years in question, habitat quality and carbon storage remained relatively stable, while soil retention and water yield fluctuated significantly. (ii) All ES pairs exhibited synergies. Spatial synergy areas were concentrated in the northwestern and southwestern areas; spatial trade-off areas alternated with spatial synergy areas. (iii) Hotspots with at least two ESs covered 73% of the study region. Middle- and high-altitude areas were the main supply areas of ES. (iv) Land-use types were the dominant driving factor of habitat quality and carbon storage, while mean annual precipitation had the strongest explanatory power for water yield. Soil retention was mainly affected by mean annual temperature and the normalized difference vegetation index. Our findings could provide guidance for policymakers when developing measures for ecosystem conservation and management.

Energy Evolution Law during Failure Process of Coal–Rock Combination and Roadway Surrounding Rock

The deformation and failure of a coal–rock system in a deep environment is affected by its own mechanical properties, natural endowments, and geological structures; it is very important to study the energy evolution law of coal–rock systems. For this purpose, a Particle Flow Code in 2 Dimensions (PFC2D) simulation was conducted to assess the coal–rock structure and roadway surrounding rock. The hard roof would produce a rebound “energy supply” phenomenon when the coal was destroyed, and the influence of rock strength on the energy evolution of the coal–rock combination was analyzed. In addition, the energy evolution law of roadway surrounding rock with different roof strength is studied; the energy evolution process of roof and coal seam and deep and shallow coal mass are compared, according to the energy storage characteristics of roadway surrounding rock in different areas; the partition energy storage model of roadway surrounding rock is established preliminarily and the concepts of energy storage area and energy supply area of roadway surrounding rock are proposed; the prevention and control methods of near-field rock burst in deep roadways are discussed, and the research conclusions can provide theoretical reference for the research on the mechanism of rock burst in deep coal mines.

Uncertainties in tropical cyclone landfall decay

Understanding the responses of landfalling tropical cyclones to a changing climate has been a topic of great interest and research. Among them, the recently reported slowdown of tropical cyclone landfall decay in a warming climate engenders controversy. Here, the global climatology of landfall decay, based on the tropical cyclone best-track data available, reveals that the reported trends are uncertain and not universal, but spatial, temporal, data, and methodology dependent such that any claim of a climate trend could be misleading at present. The effective area of moisture supply from the ocean, most likely determined by the landfalling track modes, is demonstrated to be an important factor for the decay. This study provides timely essential clarifications of the current contentious understanding.

Imbalanced supply and demand of temperature regulation service provided by urban forests: A case study in Shenzhen, China

Urban forests can provide temperature regulation service (TRS) by lowering the local temperature and further mitigating the urban heat island effect. Numerous studies have focused on how to better realize or enhance the cooling function of urban forests, but have not considered that from the perspective of supply and demand. Here, we develop a framework to quantify the supply and demand of temperature regulation service provided by urban forests, using remote sensing, meteorological and socio-economic data. Taking Shenzhen city as a case study, we analyzed the spatial distribution of both TRS supply and demand as well as their relationship in Shenzhen. We found: 1) TRS supply varied greatly in space, with areas of high supply generally located in the southeast of Shenzhen, which is mainly covered by forests, and around the boundaries of administrative districts that are distant from the urban centers. 2) TRS demand had even more significant spatial heterogeneity, showing that high-demand areas were primarily distributed in the southwest but occupied a relatively small amount of land in Shenzhen. We then categorized the spatial relationship between TRS supply and demand into four types, and identified the hotspots of highly mismatched supply and demand of TRS. Targeted urban forests planning and management measures were further proposed for each type of region. This study provides spatial tools and insights for urban forests design and planning towards better urban heat mitigation and adaptation.

Effects of Agricultural Commodity Prices on Agricultural Output in Nigeria

In Nigeria, there is over-reliance on oil proceeds at the expense of revenue accrued to agriculture, which adversely affects the standard of living. The study examines the effect of commodity prices on agricultural output in Nigeria. In the empirical model, agricultural output depends on maize, wheat, soya beans, and oil prices. Data covering 1991 and 2017 from the Central Bank of Nigeria Statistical Bulletin and Food and Agricultural Organisation was analysed using a fully modified OLS (FMOLS) technique. The result shows that maize and soya bean prices positively affect agricultural output, while wheat prices and oil prices negatively affect agricultural output in Nigeria. This implies that agricultural output increases with increased agricultural commodity prices and falls with an increase in oil prices. The paper recommends the need to expand the production of agricultural commodities through a direct government partnership with farmers in the area of supply of expert knowledge, technology and credit. Also, to redirect the populace's focus from oil in favour of agriculture, there is a need to introduce a subsidy for agricultural output to make its pricing attractive and provide leverage for farmers' occasional shocks in their yield.

Blue carbon effects of mangrove restoration in subtropics where Spartina alterniflora invaded

Mangrove swamps and salt marshes are noted for their large carbon sequestration and storage capacity. In southeastern China, mangrove transplantation is conducted as ecological restoration where exotic Spartina alterniflora (hereafter Spartina) is removed. This study aimed to evaluate the effectiveness of mangrove transplantation on carbon sink potential. We analyzed chronological sediment accretion, soil carbon sequestration, and carbon storage of mangroves and Spartina on Maoyan and Ximen islands. Results showed that on both islands mangroves and invasive Spartina stored 12.7%–31.4% more carbon than bare mudflats over top meter soils, with Spartina outperforming restored mangroves. Both restored mangroves and invasive Spartina enhanced sediment accretion, but this enhancement was minimal in high sediment supply areas like Maoyan. Spartina invasion improved carbon sequestration capacity compared to bare mudflats in Maoyan, but mangrove restoration failed. In low sediment supply areas like Ximen, restored mangroves have outperformed Spartina invasion on carbon sequestration enhancement since >5 years of planting. Thus, carbon sink potential of mangrove restoration depended on sediment supply and time, with sediment supply being more important. We suggested that it was preferable to conduct mangrove restoration with Spartina eradication in low sediment supply areas in subtropics.

Analysis of Dynamic Evolution and Spatial-Temporal Heterogeneity of Carbon Emissions at County Level along "The Belt and Road"-A Case Study of Northwest China.

Northwest region is the main energy supply and consumption area in China. Scientifically estimating carbon emissions (CE) at the county level and analyzing the spatial-temporal characteristics and influencing factors of CE in a long time series are of great significance for formulating targeted CE reduction plans. In this paper, Landscan data are used to assist NPP-VIIRS-like data to simulate the CE from 2001 to 2019. Spatial-temporal heterogeneity of CE was analyzed by using a two-stage nested Theil index and geographically and temporally weighted regression model (GTWR). The CE in northwest China at the county increases yearly while the growth rate slows down from 2001 to 2019. The spatial pattern forms a circle expansion centered on the high-value areas represented by the provincial capital, which is also obvious at the border between Shaanxi and Ningxia. Axial expansion along the Hexi Corridor is conspicuous. The spatial pattern of CE conforms to the Pareto principle; the spatial correlation of CE in northwest counties is increasing year by year, and the high-high agglomeration areas are expanding continuously. It is an obvious high carbon spillover effect. Restricted by the ecological environment, the southwest of Qinghai and the Qinling-Daba Mountain area are stable low-low agglomeration areas. The spatial pattern of CE in northwest China shows remarkable spatial heterogeneity. The difference within regions is greater than that between regions. The “convergence within groups and divergence between groups” changing trend is obvious. According to the five-year socioeconomic indicators, the economic scale (GDP), population scale (POP), and urbanization level (UR) are the main influencing factors. The direction and intensity of the effect have changed in time and space. The same factor shows different action intensities in different regions.

Growing threat to urban retail? Residential suburbanization and shopping behavior change in Shanghai, China

Many studies found the rise of suburban retail in the Western countries had negative impacts on the urban centers. Although there is a debate on that the form and process of suburbanization in Chinese cities are different from those in the developed countries, limited research have examined the impact of suburbanization on inner city retail in the context of Chinese cities. This study analyzed the changing retail hierarchy under the process of suburbanization in Shanghai, restricted by the state-led retail regulations and planning. Then, we investigate how relocating to a suburban new town influenced residents' shopping behaviors given the local and city-level retail supply. An in-home household survey is conduced to examine the changes in shopping frequencies and destination choice, in particular the difference between the residents moved from the inner city and those from the suburbs.We found the combination of the construction land quota system, the “top-down” planning and the state land ownership have protected retail hierarchy of Shanghai. The transit oriented development (TOD) mode not only delineates the catchment area of the local retail supply of the suburban new town, but also connects those suburban residents with limited car access to the inner city retail agglomerations. The survey result indicates that the residential suburbanization hasn't significantly changed the shopping frequencies of the respondents, but is associated with reduced propensity of patronizing inner city retail agglomerations. However, the willingness to shop at inner city for comparative goods such as beauty and health care, and apparel is still high for those who used to live in the inner city. In contrast, there are significant reductions in the likelihoods of shopping at the old suburban town center for those who previously lived in the district. This suggests the rise of suburban new towns might weaken the old town centers of the suburban districts rather than the inner city.

Urbanization Intensifies the Mismatch between the Supply and Demand of Regional Ecosystem Services: A Large-Scale Case of the Yangtze River Economic Belt in China

The process of rapid urbanization has been causing non-negligible disturbances to our ecosystems, which has aggravated the mismatch between ecosystem service (ES) supply and demand. A clear understanding of the relationship between the ES supply–demand mismatch and urbanization is crucial as it could have a lot of significance for implementing ecological compensation and conservation action. Although a large number of studies have explored this problem, previous studies have focused primarily on the spatial mismatching of the ESs, and only a few studies have considered the spatial relationship between the ES supply–demand mismatch and urbanization at the watershed scale. Taking the Yangtze River Economic Belt (YREB) as an example, this study quantitatively assesses the supply and demand of five ESs, including carbon sequestration, water retention, soil conservation, food production, and recreational opportunity. The bivariate Moran’s I method was used to analyze and visualize the spatial correlation between the ES supply–demand mismatch and urbanization. The results indicate that both the total supply and the total demand of the five ESs increased, while the increasing rate of total demand was higher than the total supply of the ESs; this resulted in a significant spatial mismatch between the supply and demand of the ESs from 2000 to 2020. There is also a negative spatial correlation between the ES supply–demand and urbanization, while the results of local spatial clustering have obvious spatial heterogeneity. The metropolis and its surrounding counties are mostly the ES supply and demand deficit area, but some surrounding counties have managed to transform a deficit into a surplus. These results indicate that urbanization has a certain interference on the mismatch of the ES supply and demand, and this interference is not irreversible. Moreover, this study provides a reliable reference for government management in the context of balancing urbanization and the ecosystem.

CFD simulation and experimental study of the irrigation performance of new ebb-and-flow soilless cultivation troughs

Irrigation water savings constitute an important incentive for sustainable agricultural development. Ebb-and-flow irrigation provides prominent water-saving advantages in regard to the irrigation of horticultural crops. In this study, two new ebb-and-flow soilless cultivation troughs, i.e., T- and U-type troughs, were designed based on available ebb-and-flow cultivation troughs to further improve the water use efficiency. They could be divided into substrate and water supply areas by convex separating plates. The long walls of the troughs were inclined and curved. To study the performance of these new troughs, water supply and water retention processes were analyzed using computational fluid dynamics (CFD) models. A trough with an inverted triangular profile configuration was used as the control group (CK). It was found that the water supply time consumption of the U-type troughs was the lowest, accounting for 34.48% of that of the CK troughs, and the rate of the T-type troughs was the second lowest, accounting for 55.7% of that of the CK troughs; the variation in the water retention process was negligible, at<0.5%. In addition, field experiments indicated that the U-type troughs supplied water at the highest rate and exhibited a high substrate water content, and it was determined that the U-type troughs achieved the highest irrigation efficiency, which was 1.38–1.60 times higher than that of the CK troughs, and the lowest energy consumption, accounting for 18.57%-20.28% of that of the CK troughs. Moreover, cultivation trials demonstrated that the two newly designed cultivation troughs were better than the CK trough. Consequently, the U-type cultivation trough was found to be the best choice. This study provides a theoretical basis for the ebb-and-flow soilless cultivation of horticultural crops and introduces new products to improve the irrigation water use efficiency and reduce energy consumption.

Food waste challenges at downstream interfaces: a triple bottom line dilemma

ABSTRACT This article focuses on the ongoing challenge of reduction of food waste at three downstream interfaces and food waste impact on triple bottom line dimensions: environmental, social (including ethical) and economic. The interplay between downstream interfaces (consumers-retailers; consumers-food service businesses; consumers-households) of food supply chain and areas of food waste accumulation is discussed in the article. The findings are based on a two-step method: first, a systematic literature review of the published studies on food waste between 2008 and 2020, and second, theme development to understand food waste at the three interfaces and to develop propositions for future research. The propositions are strategic interventions to provide managerial recommendations for food waste reduction involving downstream food supply chain stakeholders. The findings highlight the conundrum of balancing conflicting stakeholder perspectives within triple bottom line dimensions to tackle food waste: economic and social dimensions of triple bottom line take priority over the environmental dimension. Testing the propositions as part of future research will help to further streamline the policy recommendations to reduce food waste at the downstream part of the supply chain.

Buffalo (Bubalus bubalis) phenotypic diversity characterization reveals the need for improved performance based on quantitative and qualitative characteristics

Kalang buffaloes (KBuf) are bred in swamplands, maintained in large cages, and originate from Kalimantan Island, Indonesia, hence, the local word “kalang”. KBuf and Thale Noi buffaloes (TBuf) are important biodiversity resources in Indonesia and Thailand which permeate areas of culture, religion, meat supply, and livelihood. This study aimed to observe phenotypic characteristics within breeds of KBuf and TBuf based on quantitative and qualitative performance to define diversity. A total of two hundred and forty buffaloes were observed from North (NK), East (EK), South Kalimantan (SK) provinces of Indonesia, and Phatthalung (PT) province of Thailand. The phenotypic characterization consisted of quantitative, qualitative, and morphometric index analyses. The phenotypic characterization showed that female TBuf demonstrated the highest value on the quantitative parameters which was significantly different (P&lt;0.05) compared to KBuf. Among Kalimantan buffaloes, SK males had the highest value on the qualitative parameters which was significantly different (P&lt;0.05) from EK and NK. According to the morphometric index, male buffaloes from SK and PT have shown close index values (P&gt;0.05). Also, females from EK, SK, and PT had a close relationship (P&gt;0.05) in the morphometric indices. Based on qualitative characters, buffaloes in this study exhibited high variation in body appearance, skin, coat, and foot colors, horn pattern, backline, chevron, and whorls in the head, back, and rump. It was concluded that KBuf and TBuf have high variability in phenotypic diversity, the distribution area affects the parameter values as potentially influenced by lineage factors and ability to adapt to the environmental and management conditions.

Research on the Horizontal Transfer Payment System of Ecological Compensation in the Sanjiangyuan Watershed

As the birthplace of "two rivers and one river" and an important water supply and conservation area in my country, the Three Rivers Source Region has experienced ecological problems such as grassland degradation, land desertification, and soil erosion in recent years. my country's current financial policies such as transfer payments for national key ecological function areas, returning farmland to forests and grasslands, and protecting public welfare forests have disadvantages such as single compensation subject, small compensation funds, and incomplete assessment, incentive and performance evaluation systems. It is suggested to explore the establishment of the horizontal transfer payment for ecological compensation in the Three River Source Basin from the aspects of clarifying the subject and object of the horizontal transfer payment, defining the scope and standard of the transfer payment, broadening the path and method of the transfer payment, and improving the assessment and incentive mechanism and performance evaluation system of the transfer payment. system to serve as a useful supplement to the vertical transfer payments of the central government.

Link Ecological and Social Composite Systems to Construct Sustainable Landscape Patterns: A New Framework Based on Ecosystem Service Flows

Integrating the flow of supply and demand of ecosystem services (ESs) into the ecological security pattern (ESP) of coastal ecosystems with extremely fragile ecological backgrounds and contradictory human–land relationships is beneficial to the coordinated development of human–land systems. However, existing studies ignore the issue of scales of supply–demand linkages, making the ESP not properly guide sustainable development. Based on ESs delivery chain theory and landscape ecology approaches, we developed a sustainable development framework consisting of coupled microscopic natural–social systems. The method was tested using data from the Liao River Delta. In this study area, the natural supply potential and demand mapping distribution of key ESs were assessed to identify ecological sources in the Liao River Delta, a typical coastal zone in northern China. The resistance surface based on land use type assignment was modified using hydrological connectivity frequency and nighttime light intensity. Ecological corridors were extracted and optimized using a minimum cumulative resistance model and connectivity evaluation. The study found that the high supply area and the high demand reflection area are not consistent in location and supply level. Ecological source areas are evenly distributed, accounting for 12% of the total area. The ecological corridors are mainly concentrated in the west and southeast and do not cross the built-up areas in the east. This ESP framework safeguards the local demand for natural products and the natural potential to maintain services over the longer term and to a larger scale while informing the development of environmental management measures.

The Influence of Multiple Types of Flexible Resources on the Flexibility of Power System in Northwest China

The development of renewable energy is of great significance to relieve the pressure on the energy supply and promote the low-carbon operation of the power system. However, the volatility of renewable energy, especially wind and solar energy, has a great impact on the safe and reliable operation of the power system. If we want to introduce renewable energy and ensure the safe and reliable operation of the power system, it is necessary for the power system to provide enough flexibility. Northwest China is rich in natural resources and an important area of power supply in China, which also faces the problem of insufficient flexibility. Therefore, based on the power system development and natural conditions in northwest China, this paper studies the key factors affecting the flexibility of the power system when renewable energy accounts for a large proportion, and proposes measures to improve the flexibility of the power system by using the power system optimization tool Flextool developed by IRENA.

Drinking water nitrate and risk of pregnancy loss: a nationwide cohort study

BackgroundNitrate contamination is seen in drinking water worldwide. Nitrate may pass the placental barrier. Despite suggestive evidence of fetal harm, the potential association between nitrate exposure from drinking water and pregnancy loss remains to be studied. We aimed to investigate if nitrate in drinking water was associated with the risk of pregnancy loss.MethodsWe conducted a nationwide cohort study of 100,410 pregnancies (enrolled around gestational week 11) in the Danish National Birth Cohort (DNBC) during 1996–2002. Spontaneous pregnancy losses before gestational week 22 were ascertained from the Danish National Patient Registry and DNBC pregnancy interviews. Using the national drinking water quality-monitoring database Jupiter, we estimated the individual and time-specific nitrate exposure by linking geocoded maternal residential addresses with water supply areas. The nitrate exposure was analyzed in spline models using a log-transformed continuous level or classified into five categories. We used Cox proportional hazards models to estimate associations between nitrate and pregnancy loss and used gestational age (days) as the time scale, adjusting for demographic, health, and lifestyle variables.ResultsNo consistent associations were found when investigating the exposure as a categorical variable and null findings were also found in trimester specific analyses. In the spline model using the continuous exposure variable, a modestly increased hazard of pregnancy loss was observed for the first trimester at nitrate exposures between 1 and 10 mg/L, with the highest.adjusted hazard ratio at 5 mg/L of nitrate of 1.16 (95% CI: 1.01, 1.34). This trend was attenuated in the higher exposure ranges.ConclusionNo association was seen between drinking water nitrate and the risk of pregnancy loss when investigating the exposure as a categorical variable. When we modelled the exposure as a continuous variable, a dose-dependent association was found between drinking water nitrate exposure in the first trimester and the risk of pregnancy loss. Very early pregnancy losses were not considered in this study, and whether survival bias influenced the results should be further explored.

Land redevelopment and migrant inflows in Chinese cities

ABSTRACT This paper investigates how land redevelopment is associated with a city’s potential to attract migrants. Based on empirical analysis conducted by using over one million records of land transaction data between 2008 and 2018 in Chinese cities, we observe that cities with a larger ratio of redevelopment land in the total area of land supply on average have attracted more of the migrant population. Moreover, a high proportion of redevelopment area for public services and infrastructure in the total land redevelopment area can further attract migrants. We also find a larger effect of land redevelopment in attracting migrant inflows in less developed regions than developed regions. These findings suggest the advantages of intensive urban strategy (‘compact urban’) compared with extensive urban strategy (‘urban sprawl’) in attracting migrant population. Implications of these findings for urban governancear are discussed.