Spatio-temporal features of scaling farmland and its corresponding driving mechanism in Three Gorges Reservoir Area
LIANG Xinyuan1,, LI Yangbing1,2,
1. School of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China
2. Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing 401331, China
Chongqing Basic and Frontier Research Program, No.cstc2015jcyjBX0128;
Chongqing Normal University Graduate Student Research Innovation Project, No.YKC17020;
The discussion on function transformation of agricultural utilization and its corresponding driving mechanism in the Three Gorges Reservoir Area (TGRA) can reflect the change of the relationship between people and environment in the transitional belt between central and western China, mountainous areas and reservoir area, and provide a scientific basis for the development of agricultural multi-function in typical mountainous areas. This paper, selected five counties from the hinterland of the TGRA as the study area, analyzed the change of scaling farmland and its corresponding mechanism by defining the concepts of "scaling farmland", with the aid of Arcgis10.2, SPSS, geodetectors and other technical means. Results show that the scaling farmland was mainly converted from cultivated land and shrubland. Apart from some land used for alpine off-season vegetables, the growth of scaling farmland generally occurred at low altitude, and was mainly found in the range with a slope of 30°. The spatial change of scaling farmland of different types was significantly different, which was closely related with road and township administrative center. At the patch level, natural factors such as elevation and slope contribute much to the scaling farmland. At the township level, the driving forces of socioeconomic and humanistic factors were attributed to road traffic, agricultural population density and so on. At the regional level, the influencing factors of each county were more significant than those of the study area. The change and development of scaling farmland was driven by many factors. But the agricultural policy had been one of the dominant factors. Behavior subjects at different levels would promote the scaling farmland development in different directions under the background of national agricultural development and policy implementation.
Three Gorges Reservoir Area;
function transformation of agricultural land;
Land use intensification is an unimpeachable choice of human beings under the multiple pressures of food security, economic development, and ecological conservation. It is particularly important for the countries with less land resource per capita like China to foster a sustainable intensification in their use of land. The scienti fi c understanding of land- use change, however, is still insuf fi cient to characterise the conditions under which such a sustainable intensi fi cation can and will occur. The existing large knowledge gaps should be filled in the future. In this paper, we briefly review main progress in the research on land use intensification. The content is arranged in two sections. The first section focuses on four subtopics: (1) basic characters and their measuring indicators, (2) extremum and potential for input and output, (3) driving factors and limiting factors, (4) ecological effects and sustainable intensification. The second section is on current hotspots: monitoring and mapping land use intensity, land sharing & land sparing, policy premise and choice, and urban land "intensification" in China.
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<P> Abstract. By comparing field measurements from 1989, 1997, and 1998, the differences between farmland (sloping farmland, sloping farmland with contour cultivation, terraced farmland) and orchard (terraced orchard, unterraced orchard), in the Three Gorges Reservoir Area, were significant for runoff ( P <0.01), erosion ( P <0.05) and nutrient loss ( P <0.05). Taking into account economic costs and environmental influences, reasonable and sustainable land use on slopes of 25 in the Three Gorges Reservoir Area should be unterraced orchard.</P>
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