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Wu J.,University of Science and Technology of China | Wu J.,Peking University | Feng Z.,Peking University | Gao Y.,China Agricultural University | And 2 more authors.
Acta Geographica Sinica | Year: 2014

Urban land ecological policy is an important management tool to enhance ecological construction and urban sustainable development. In this paper, Shenzhen was chosen as a typical case of rapid urbanization areas. A combination of land-use change and ecological effect quality models was used to evaluate the effects of two types of urban landuse policies, scale-control policy and space-control policy. The results showed that: (1) During the urbanization process, habitat fragmentation, connectivity decreasing and degradation are resources of ecological risks, which can be alleviated by the implementation of ecological policy. (2) Scale-control policy can enhance landscape connectivity and curb the trends of landscape fragmentation and habitat degradation, but it may result in an increase of the intensity of construction. (3) Space-control policy can maintain ecological land pattern, and curb the trends of landscape fragmentation and habitat quality decline, but it can play a limited role in maintaining the landscape connectivity. (4) The synergistic effect of simultaneously implementing the two policies results in better effects than separately implementing them. ©, 2014, Science Press. All right reserved. Source


Yun W.,China Agricultural University | Zhu D.,China Agricultural University | Zhu D.,Key Laboratory of Agricultural Land Qualify | Tang H.,Land Consolidation and Rehabilitation Center
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2016

The concept and function of land consolidation in China have been continuously enriched and expanded since 1997, which has become more and more significant for the implementation of China's most stringent farmland protection and economical and intensive land use system. This paper reviews China's land consolidation practice and theoretical research of recent 20 years. Land consolidation in China now is experiencing a new adjustment stage after its 3 stages of development. Each stage has different features, of which Stage 1 focuses on the cultivated land quantity supplement, Stage 2 on basic farmland protection and construction, Stage 3 on the comprehensive improvement of the regional land, and now i.e. Stage 4 is taking the ecological concept for the guide. Total conditions about China's land consolidation planning implemented during the "Twelfth Five-Year Plan" is summarized in the paper and its main goal has basically been completed, including the goals of constructing 26.67 million hm2 high standard farmland, supplementing 1.6 million hm2 farmland, and constructing 116 basic farmland protection demonstration areas and 500 high standard farmland demonstration counties. A contrastive analysis on land consolidation objectives and implementation from 2011 to 2015 is made and 5 major problems of China's land consolidation at the present stage are pointed out, which include that the integrated land consolidation practice is still in low level, the pressure on the resources and environment has not been effectively relieved, the implementation effect of the construction land differs greatly in different areas, the land ecological remediation practice level is not high, and the land consolidation funds are instable. At present, China's economic and social development has entered a new normal. An effective way to solve the problems about food security, village reform and urban governance is urgently needed by innovating land consolidation concept, reconstructing land consolidation strategy, objectives and priorities, and breaking the bottleneck constraint of resource on economic growth so as to achieve rational land use comprehensively. Above all, the paper gives 6 suggestions. Firstly, innovate land consolidation concept by taking green development as the land consolidation change direction; secondly, in accordance with the requirements of the development, effectively organize the land consolidation projects by type classification, regional classification and degree classification; thirdly, build more than 10 million mu farmlands with the focuses on eco-farmland construction; fourthly, full strategies should be implemented and supported by land reclamation project; fifthly, promote the land comprehensive improvement and optimize land spatial pattern; sixthly, strengthen the demonstration construction and improve the policy mechanism. © 2016, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved. Source


Xie B.,China Agricultural University | Xie B.,Key Laboratory of Agricultural Land Qualify | Zhu D.,China Agricultural University | Zhu D.,Key Laboratory of Agricultural Land Qualify | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

Rural residential renovation is not only an important part of comprehensive rural land improvement, but also the inevitable choice of overall planning for urban-rural development and new rural construction. Location is one important factor that affects rural residential development and layout, which determines the degree of difficulty and priorities in rural residential renovation. It is an important condition when selecting the rural residential renovation mode, and a significant basis for making the decision of which mode to adopt at the same time. This study took the rural residential areas (plaques) as the research object, and established a location evaluation index system that included natural and socio-economic factors such as the distance between the settlements and the county, the distance between the settlements and towns, the distance between the settlements and the gathering area, the distance between the settlements and a highway that is above the county level, the distance between the settlements and rivers, and gravity value and terrain conditions of the settlements. It then used the method of Analytic Hierarchy Process to determine the weight of each index. In this paper, the northern plateau region of Linxia County, Gansu Province was taken as the study area and NERA tools and statistical functions of ArcGIS 9.3 were used to evaluate and grade the region's rural residential location conditions. On the basis of the condition of residential area without breaking the boundaries of villages, the paper accounted for the total condition value of every aDm inistrative village through an area-weighted summation of the total value of settlements, then divided the location score values into five grades according to the frequency mutation, and finally put forward five kinds of arrangement modes corresponding to the location level, such as the development-oriented, retaining type, potential-tapped pattern, settlements-merged pattern, and migration model, which was according to the regional level and the current situation and condition constraints of all residential areas under the different condition characteristics. The development-oriented mode corresponded to the location I area, whose main optimization direction was to speed up urbanization and farmland circulation, to dismantle scattered settlements, and to encourage farmers to go into town. The retaining type mode corresponded to the location II district, whose main optimization direction actively implemented the rural residential renovation and dismantled scattered settlements. The potential-tapped pattern corresponded to the location III level area, whose main optimization direction tapped the internal potential of the residential area, dismantled scattered settlements, improved the degree of centralization of residential area, and developed irrigation agriculture on the advantages of water. The settlements-merged pattern corresponded to the location IVlevel area, whose main optimization direction actively implemented the rural residential renovation, dismantled scattered settlements, and improved the concentrated extent of residential areas. The migration model corresponded to the location level ν area, whose main optimization direction implemented the whole village relocation project for the target of ecological protection, and it should adjust measures to local conditions after finishing the land consolidation. The results of the study emphasized that the renovation mode under the location conditions considered took into account both strengths and weaknesses of different conditions of rural residential areas, and the different arrangement modes resulted in different emphases. This study can provide an effective reference for new local rural construction, the comprehensive improvement of rural land, and the link of increase and decrease of the land for construction use in both urban and rural areas, etc. Source


Xie B.,China Agricultural University | Xie B.,Key Laboratory of Agricultural Land Qualify | Zhu D.,China Agricultural University | Zhu D.,Key Laboratory of Agricultural Land Qualify | And 4 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

In this paper, we constructed the comprehensive evaluation system, including identification of the potentiality, the complexity of patch shape and location condition. It aimed at determining consolidation schedule on rural residential area. The difficulty and necessity have been analyzed respectively from the complexity of patch shape and feature of location condition in rural residential area. Rural habitat consolidation tailored to the consolidation potential was mainly divided into three different parts, namely, the short-term, medium-term, and long-term consolidations. Firstly, we combined with socio-economic data and "village" as a unit. The rating of consolidation potential on rural residential area was determined by comprehensive evaluation and the potentiality of consolidation was identified from the macro level. Secondly, the features of patch shape were analyzed by the landscape ecology. The ratings were determined on the complexity of patch and location condition in rural residential area within the territory of Yumen city. Based on this, it weighed for the rating on the complexity of patch shape and location condition using raster calculator through the spatial overlay. After that, we identified the priority of the habitat consolidation. Finally, the consolidation schedule on rural residential area was determined in space and time dimension. The result showed that there was obvious difference on consolidation potential for rural residential area in Yumen. The relatively greater potential area covered 22 administrative villages, about 960.31 hm2, while medium potential area included 32 administrative villages with 2 053.72 hm2, and lower potential area had three administrative villages with 908.26 hectares. According to the rating results on the complexity of patch shape in rural residential area, the consolidation potential from grade I to V was 766.25 hm2, 731.93 hm2, 908.26 hm2, 535.14 hm2 and 377.30 hm2, respectively. As a result, the higher the potential level was, the lower the complexity of patch it was. Given the rating results in rural residential area, it showed that the location condition from grade I to grade V was 827.83 hm2, 1 096.09 hm2, 789.81 hm2, 513.63 hm2 and 119.11 hm2, respectively. The higher level meant the poor location condition. The patch size of the priority consolidation, secondary consolidation, and final consolidation on rural residential area in Yumen was respectively 1 291.08 hm2, 1 712.2 hm2, 315.64 hm2. From the calculated results of consolidation potential for rural residential area, we concluded that there were 426.05 hm2 needed to be consolidated in the short term, 635.40 hm2 in the medium term and 2 257.48 hm2 in the long term. The rural residential area was regarded as a basic research unit, and this paper completely examined the relationship between the feature of patch shape and habitat consolidation. At the same time, location condition of the patch also can be comprehensively analyzed. On the one hand, the complexity of patch shape determined the difficulty of consolidation. On the other hand, identification of location condition determined the necessity of consolidation. Both sides have a comprehensive impact on the priority of habitat consolidation. This paper will not only help guide the consolidation of rural residential area, but also will provide the relatively reasonable arrangement on the timeline for consolidation in Yumen. Source

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