Huang D.,Beijing Normal University |
Jin H.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research |
Jin H.,University of Chinese Academy of Sciences |
Zhao X.,Urban Rural Planning Administration Center |
Liu S.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research
Sustainability (Switzerland) | Year: 2015
Rapid urban land expansion and the resulting arable land loss have put food security in China at risk. This paper investigates the characteristics and mechanism of arable land conversion in Beijing using a logistic model based on land-use data for 2001 and 2010. The results suggest that (1) arable land conversion tends to occur near built-up areas, city centers and major roads; (2) arable land that lies closer to irrigation canals and country roads is less likely to be converted to urban use; (3) arable land that is bigger in size and has a more regular shape has a lower probability of conversion to urban use; and (4) the Prime Farmland Protection policy and related land-use plan have played a positive role in preserving arable land, demonstrated by the probability for arable land conversion inside a prime farmland boundary is 63.9 percent less than for land outside the boundary. Based on these findings and on sustainable-development principles, we suggest that, rather than an exclusive focus on controlling the quantity of arable land, the location and characteristics of the arable land should be a primary consideration when designing urban policies and plans. © 2014 by the authors.
Shen Y.,Renmin University of China |
Yan J.,Renmin University of China |
Wang C.,Urban Rural Planning Administration Center
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015
In view of increasing acute contradiction between urban expansion and farmland preservation, landscape and ownership fragmentation and the unstable overall layout characteristics of prime farmland in the metropolitan suburb, it is of great significance to study three-level concentrated prime farmland protection areas zoning and classified regulatory mechanism in the metropolitan suburb, which would keep the balance between the farmland preservation and urban development, and promote intensive and innovative land use. The paper aimed at exploring the permanent protection mechanism of prime farmland in metropolitan suburb combining protection with development, management, and environment improvement. Taking the typical metropolis suburb Changping District as the case study area, this paper firstly specified five objectives of the permanent protection mechanism, namely, the layout centralization, construction reduction, function diversification, management differentiation and capital intensification. With the concentrated prime farmland identification index system built, composed of 11 indicators, this paper analyzed the concentrated degree, the stability and rehabilitation potential. Data mainly comes from the second national land survey data updated to 2013 and land use planning database of Changping District. Meanwhile, alternative concentrated prime farmland areas were filtered and classified, according to the AHP identification results and the classify guideline of "Function, Spatial, Scale" principle. Three levels were categorized, the municipal-level, the district-level and the township-level respectively. The three-level concentrated prime farmland special planning is used to clarify the protection responsibility target at all levels and spatial control regulation, determine the evaluation indexes such as quantity, quality and function of prime farmland, and establish the "economic compensation and index reward" joint horizontal mechanism and three-level "rewards and punishments" joint vertical mechanism. The results indicated that: 13 three-classified prime farmland protection areas were demarcated including one municipal concentrated protection area, six district areas and six township areas, which achieved 96.63% of the prime farmland protection in Changping District. Three-classified farmland protection areas zoning revitalized the stock of construction land effectively, taped the reserve cultivated land resources fully, and increased 1149.97 hm2 cultivated land. The zoning also relieved the landscape and ownership fragmentation, enhanced the management unit scale to 38.76 hm2 and lowered the degree of landscape and ownership fragmentation to 1.21%. In addition, it optimized the farmland landscape pattern, expanded the multiple function of basic farmland utility: after delimiting 6 809.06 hm2 basic production function farmland protection area, it also expanded 1172.88 hm2 landscape function centralized protection area, 1003.03 hm2 ecological function protected area, and 807.03 hm2 blocking function centralized protection area. Moreover, it improved the prime farmland protection enthusiasm of the township and reduced the urban burden of two levels of capital and management pressure. The results could save 329.83 million Yuan for financial capital. The mechanism, three-level concentrated prime farmland protection areas zoning and classified regulatory in the metropolitan suburb, can guide the prime farmland concentrating, optimize the layout of prime farmland protection areas, extend the multi-function roles of prime farmland, strengthen the decentralized management of prime farmland, concentrate prime farmland capital allocation, then promote the scale management of prime farmland and improve the quality of the protection. With the farmland landscape pattern optimized and protection fund allocation efficiency and management efficiency improved, the results can help provide reference to decision makers and relevant researches for the national spatial planning of prime farmland protection and targeted policies making. ©, 2015, Chinese Society of Agricultural Engineering. All right reserved.
Huang D.,Beijing Normal University |
Liu Z.,Beijing Normal University |
Zhao X.,Urban Rural Planning Administration Center
Sustainability (Switzerland) | Year: 2015
The spatial structure of Beijing has changed dramatically since the reforms of the late 1970s. It is not clear, however, whether these changes have been sufficient to transform the city's monocentric spatial structure into a polycentric one. This paper uses 2010 enterprise registered data to investigate the spatial distribution of employment in Beijing. Using a customized grid to increase the spatial resolution of our results, we explore the city's employment density distribution and investigate potential employment subcenters. This leads to several findings. First, Beijing still has strong monocentric characteristics; second, the city has a very large employment center rather than a small central business district; third, five subcenters are identified, including four in the suburbs; and fourth, a polycentric model that includes these subcenters possesses more explanatory power than a simple monocentric model, but by only four percentage. We conclude that the spatial structure of Beijing is still quite monocentric, but may be in transition to a polycentric pattern. © 2015 by the authors.
Hu Y.,Urban Rural Planning Administration Center |
Hooimeijer P.,University Utrecht |
Bolt G.,University Utrecht |
Sun D.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research
Habitat International | Year: 2015
Land marketization and housing commodification have stimulated inner-city restructuring and urban expansion in China and have also induced a large amount of population displacement. Affordable housing, as part of compensation, tends to be the most common relocation housing for displaced households. It is allocated through two approaches: in-kind compensation and monetary compensation. Local government provides in-kind compensation to displaced households in the form of affordable housing, as direct compensation for demolished houses, and gives priority to those who have received monetary compensation to enable them to purchase affordable housing at a discount from the market price. The process of negotiation between local government and displaced households is complicated. As a result, uneven compensation occurs in terms of compensation approaches, as well as in how much displaced households are paid for similar new affordable houses. This study conducts a detailed analysis of the uneven displacement compensation and relocation process. It uses residential surveys conducted in Nanjing to examine uneven compensation along two dimensions: compensation approaches and the purchasing discount on new, compensated affordable housing. © 2015 Elsevier Ltd.
Wen Y.,CAS Institute of Electronics |
Ma P.,CAS Institute of Electronics |
Sun Y.,CAS Institute of Electronics |
Sun Y.,Urban Rural Planning Administration Center |
Xu C.,CAS Institute of Electronics
Sensor Letters | Year: 2013
Thanks to the large number of remote sensing images acquired by satellite sensors for the same area over time, it is now feasible to identify potential changes occurred on the ground. In this paper, a comprehensive Weighted Attributes Error Diffusion algorithm (WAED) is proposed to detect changes of remote sensing images. This algorithm dedicated in using multi-attributes to balance effect of each feature that may not be identical in source images from different satellites and in different spacial resolutions. The creativeness of the proposed algorithm lies in two aspects: (1) it combines several attributes to produce general comparing result. (2) The error diffusing process strongly enhances the accuracy of detecting area. Our algorithm contributes to detect change area accurately for remote sensing images from different satellite in different spacial resolution. Experimental results validate the effectiveness of our scheme and demonstrate that it outperforms previous methods. Copyright © 2013 American Scientific Publishers.