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Zhou W.,University of Science and Technology of China | Cao Y.,University of Science and Technology of China | Wang J.,Land Key Laboratory of China Land Survey and Plan Institute | Yuan C.,University of Science and Technology of China
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

The purpose of this paper is to analyze on pattern changes and traits of rural residential areas during 30 years in Three Gorges Reservoir Area, and provide the basis for rational use of rural residential areas and potential mining. Apply of combining of the methods of qualitative and quantitative analyses, analyze on the changing rules from the whole to the local. The results are that, 1) Rural residential areas are located surrounding the urban areas, and distributed along the river bank, while rural residential areas are small in the middle and downstream area. 2) The increasing of rural residential areas is due to occupying cultivated land, forestry land and grassland, and rural residential areas occupying cultivated land is gradually reducing because of the policy of cultivated land protection. 3) Regional differences are relatively large about rural residential area changes, and the scale is enlarging from scattering to concentrating, the compact degree is relatively low, the potential of intensive use is large. The conclusion is that the research can understand the structure and changing traits of rural residential areas. Source


Zhou W.,University of Science and Technology of China | Cao Y.,University of Science and Technology of China | Wang J.,Land Key Laboratory of China Land Survey and Plan Institute
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

In order to appraise landscape traits of rural residential land and analyze the relationship between integrated landscape index and theory potentiality, the paper took the rural residential land of Xiyu village as the research object, and constructed the appraisal index system from the rural residential land scale, land-use, distribution and shape with the method of landscape ecology. And integrated landscape trait and the contribution of sole landscape index to the integrated landscape trait was analyzed based on integrated landscape index and principal component analysis. The results showed that the proportion of land use was high and many groups were in the intensive areas, and the extent of intensiveness was impacted greatly by altitude and slope. The scales of many groups were large and the connection was compact, the shape was neat. The large residential land coexisted with small and scattered residential land. Integrated landscape trait was influenced by some landscape traits following the contribution ratio, it was important to develop the distribution and shape traits in order to improve the integrated landscape trait. The relationship was obvious between integrated landscape index and theory potentiality, which took on the trend of Parabola, that was, the bigger of integrated landscape index, the lower of the theory potentiality. Source


Cao Y.,University of Science and Technology of China | Zhou W.,University of Science and Technology of China | Wang J.,Land Key Laboratory of China Land Survey and Plan Institute | Yuan C.,University of Science and Technology of China
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

This paper is purpose to measure landscape indexes traits with changes of grain sizes, and summarize differences of landscape traits in different grain sizes. In this paper, five remote sensing images of Three Gorges Reservoir Area in 1975, 1987, 1995, 2000 and 2005 were taken as data for present study. The images were interpreted into draws of landscape pattern. In the ArcView3.3 environment, the vector draws were transformed into shatter draws according to different spatial grain size. In the same time, landscape indexes were chosen and the effects between spatial grain size and landscape indexes were measured at the scale of pattern and landscape. Then the correlation differences between landscape indexes and spatial grain size were analyzed with the method of correlation analysis. The results showed that, the traits of changes of landscape patterns were proved in 30 years. The effective sensitiveness between different landscape indexes and spatial grain size was different, such as patch density (PD), effective mesh size (MESH), standardized trait index (NSLI), aggregation index (AI), and same landscape pattern in the process of measuring was taken on different change rules, such as cultivated land (slope<25°), forestry land, grassland, urban constructive land. There were some turning points in the changes of effect, especially at 400 m. At the scale of landscape, patch density and land shape index were largely impacted by the spatial grain size. The correlation between the same index and grain shows highly consistency at the scale of pattern and time. Above all, this research can reflect the change rules of landscape indexes in different spatial grain size. Source


Cao Y.,University of Science and Technology of China | Zhou W.,University of Science and Technology of China | Wang J.,Land Key Laboratory of China Land Survey and Plan Institute | Yuan C.,University of Science and Technology of China | Zhao L.,Hebei University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

In order to construct indicator system of the cultivated land intensive use appraisal and compare two appraisal methods to find the difference of intensive use scores, this paper takes cultivated land intensive use in Three Gorges Reservoir Area as researching object, and connects closely the concept of land intensive use. Principal component analysis (PCA) and analytic hierarchy process (AHP) were used to calculate the intensive use scores in 21 counties according to the same appraisal indicator system. In the same time, the appraisal results were compared and the results showed that difference of appraisal results order was small. The intensive use scores were divided into four grades, the spatial difference of grades were implemented by the ARCGIS 9.2. The distributions of intensive use scores took on evident consistency. Impact trend of contribution by PCA was similar to weight trend of code layer by AHP. Above all, on one hand, this paper can improve the accuracy of intensive use appraisal, on the other hand, give some advices to enhance intensive use degree of cultivated land in Three Gorges Reservoir Area. Source

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