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Feng T.,China Agricultural University | Feng T.,Key Laboratory of Agricultural Land Quality and Monitoring of Land and Resource | Zhang F.,China Agricultural University | Zhang F.,Key Laboratory of Agricultural Land Quality and Monitoring of Land and Resource | And 4 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

For the cultivated land quality comprehensive evaluation there have been relatively abundant research results at present, but most of them tend to judge the suitability of spatial distribution of cultivated land and prime farmland without taking sufficient attention to the ecological security. The cultivated land quality comprehensive evaluation plays an important part as prerequisites and groundwork in demarcating of prime farmland and high-standard prime farmland construction. On the basis of dissecting the concept and method of cultivated land quality evaluation, the paper constructed a cultivated quality comprehensive evaluation system by way of selecting relevant indicators from the natural quality, site conditions, spatial pattern and ecological security of cultivated land through referring to agricultural land classification, agricultural land gradation, cultivated land scale operation and its ecological security. The study aimed at meeting the inner demands for demarcating of prime farmland and made up for the deficiency in the present related researches, then achieved quantitative analysis of various indexes and calculation on the cultivated land quality comprehensive index with the help of GIS. On the above basis, the study divided 5 916 cultivated land parcels into 4 different types according to the similarity theory in Pinggu district: 1) The first one, named as the prior planning type, was up to 4 325.29 hm2 and accounted for 35.06% of regional total cultivated land area, distributed mainly in the western, southern and southwest plains of Pinggu district, mainly in the town of Donggaocun, followed by the towns of Yukou and Mafang, which showed comprehensive optimum in the natural quality, site conditions, ecological security and spatial pattern of cultivated land as the preferred object to be prime farmland or high-standard prime farmland. This type became the core part of cultivated land protected in Pinggu district. 2) The second one, named as the suitable addition type, was 3511.84 hm2 and accounted for 28.47% of regional total cultivated land area, distributed in the west, south and southwest plains of Pinggu district, especially in the towns of Donggaocun, Mafang and Machangying, which showed a sign of cultivated land landscape fragmentation without any restriction in the other three aspects. This kind of cultivated land's quality comprehensive index decreased mainly due to the spatial fragmentation caused by carving up and occupation from the construction land, which weakened the scale effect of modern agriculture. It was effectual to take action of land consolidation or parcel spatial adjustments to promote the concentration and connectivity for the cultivated land of suitable additional type as the object of the prime farmland or high-standard prime farmland. 3) The third one, named as the main regulation type, was 2 606.45 hm2 and accounted for 21.13% of regional total cultivated land area, whose spatial distribution presented shifting trend from plains to semi-mountainous regions and their restrictive factors were complicated. The changing slope, weakening location advantage and fragmentation were the main reasons for the decrease of some cultivated land's quality comprehensive indices, which could improve the quality to be prime farmland by diversified means such as land leveling project, soil improvement, spatial adjustment of cultivated land parcel and so on. As for the other one that the quality comprehensive index decreased caused by restriction of ecological security pattern, to improve the comprehensive quality was harder than the former one and whether or not to become the prime farmland depended on the coordinated control between the productive and ecological function of cultivated land. 4) The last one, named as the removal quitting type, was 1 892.12 hm2 and accounted for 15.34% of regional total cultivated land area. This kind of cultivated land was not suitable as the prime farmland because of the intense restriction from the natural quality, site conditions, spatial pattern and ecological security of cultivated land. Those ones in mountainous area should bring about the ecological restoration; meanwhile, the other ones in plains should act as the urban greening function with other prime farmlands. The study results reflect the comprehensive quality of regional cultivated land, which have practical and guidance roles in planning method of the county prime farmland protection zone and high-standard prime farmland construction. Simultaneously, the classification of cultivated land can provide a reference for the functional zoning and regulation of cultivated land, the differential construction and management of prime farmland and the transformation of agricultural modernization. Source


Li C.,China Agricultural University | Zhang F.,Key Laboratory of Agricultural Land Quality and Monitoring of Land and Resource | Jiang G.,Beijing Normal University | Zhu T.,Key Laboratory of Agricultural Land Quality and Monitoring of Land and Resource | Zhang B.,Key Laboratory of Agricultural Land Quality and Monitoring of Land and Resource
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

The sprawl of a metropolis driven by urbanization has a positive impact on the expansion of satellite cities around it, which also results in rapid changes of regional land use types. The purpose of this research aimed at deeply understanding the utilization characteristics of rural residential land in the satellite city area of Beijing. In this paper, taking the key construction satellite city of Beijing, Shunyi District, as a study area, based on the vector data base of a second national land survey in 2009, combining the methods of quantitative geography models and GIS spatial analysis technology, analyses were conducted of the utilization characteristics, internal structure, and spatial distribution and driving force of the rural residential area. It was concluded that: 1) In the course of rapid industrialization and urbanization, the rural residential land in metropolitan and satellite city areas also manifest obvious changes. The demands of space and raw material storage of industries diversifies the land use types in rural residential land. There are many land use types in rural residential areas, and the industrial land and warehouse land have been the important types, which reflect the rural economic activities, especially, some towns' industrial land area has been the dominant land use type. 2) Spatial differences are significantly large in the utilization of rural residential land of different towns, with the role of location factors being relatively prominent. The average size of the rural residential area of the central and western regions were too large, and the location index and diversity index are relatively high; the stability index shows a spatial pattern that rose gradually from west to east, but the rural residential land that are involved in the economic impact of airport logistics had higher stability, and its land using forms were more regular. 3) The spatial distribution of the rural population and rural residential areas showed obviously disjoint, with a large number of the rural population, who have been almost taken out of traditional agricultural production, gathered at the edge of the built-up areas. 4) The rural residential land and its internal structure characteristics reflect different levels of development of productive forces, and rural industrial development has become the most direct driving force in promoting space morphological changes of rural living and production. So, the research concluded that the rural residential land is similar to the utilization of urban land with the development of the rural economy, therefore there is a need for rural residential land management and planning which inevitably leads to reform and development. In order to optimize future spatial layout of a metropolis, satellite cities, town and rural residential land, and proper spatial layout of cities, towns and villages need to be optimized. And rural residential land located on the outskirts of satellite cities should be consolidated first in the priority order. Finally, the paper can provide an academic basis for rural residential land planning, land consolidation, and new countryside construction and rural industrial development in practice. Source

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