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Hu Y.,China University of Geosciences | Hu Y.,Key Laboratory of Land Consolidation | Zheng Y.,China University of Geosciences | Zheng X.,China University of Geosciences | Zheng X.,Key Laboratory of Land Consolidation
Chinese Geographical Science | Year: 2013

This study investigated and simulated land use patterns in Beijing for the year 2000 and the year 2005 from the actual land use data for the year 1995 and the year 2000, respectively, by combining spatial land allocation simulation using the CLUE-S model, and numerical land demand prediction using the Markov model. The simulations for 2000 and 2005 were confirmed to be generally accurate using Kappa indices. Then the land-use scenarios for Beijing in 2015 were simulated assuming two modes of development: 1) urban development following existing trends; and 2) under a strict farmland control. The simulations suggested that under either mode, urbanized areas would expand at the expense of land for other uses. This expansion was predicted to dominate the land-use conversions between 2005 and 2015, and was expected to be accompanied by an extensive loss of farmland. The key susceptible to land-use changes were found to be located at the central urban Beijing and the surrounding regions including Yanqing County, Changping District and Fangshan District. Also, the simulations predicted a considerable expansion of urban/suburban areas in the mountainous regions of Beijing, suggesting a need for priority monitoring and protection. © 2013 Science Press, Northeast Institute of Geography and Agricultural Ecology, CAS and Springer-Verlag Berlin Heidelberg.


Cao Y.,University of Science and Technology of China | Cao Y.,Key Laboratory of Land Consolidation | Zhang X.,University of Science and Technology of China | Bai Z.,University of Science and Technology of China | And 6 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015

The transformation of land use type occurs frequently in the composite area of ore-agriculture-urban driven by industrialization, urbanization and urban-rural integration. This transformation is especially affected by the government policy of returning marginal cultivated land to forest and grassland, and reclamation of urban and rural construction occupied land and opencast mining site. This study aimed at revealing the process, characteristics and major causes of land use type transformation in nearly 30 years in the composite area of ore-agriculture-urban in the Loess region. With transformation maps of land use types in the periods of 1986-1996, 1996-2000, 2000-2004, 2004-2009 and 2009-2013, the important values, areas and space distribution of main transformation types were analyzed. The zoning of land use type transformation during 1986-2013 was divided, and the causes of land use type transformation were discussed. The results showed that the differences of transformation types in different periods were obvious and the number of transformation types was increased. There were 17 transformation types in the period of 1986-2013 and the sum of important values of the dominate transformation types was 94.58%, and the other transformation types were 22 and the sum of important values were 5.42%. The sum of important values in different periods presented decreasing trend. The transformation types gradually presented from the state of transformation in farmland to the coexistence of transformation in farmland, transformation between farmland and construction land, transformation between farmland and damage land. The results also showed that all transformation types presented the trends of convergence and diversity in regional distribution. In Xiangyangbao county, Jingping town, Baitang county, transformation from cultivated land into construction land was significant. In the southeast of Jingping town, the northwest of Taocun county, and the middle part of Yuling county, a great amount of cultivated lands became damage lands. Transformation among cultivated land, forestland and grassland was noticeable in the east, the southeast and the north of the studied area. The study area has been divided into regions of farmland transformation to construction land, farmland transformation to damage land, and region of farmland transformation to farmland transformation. Meanwhile, the region of farmland transformation was divided into region of cultivated land transformation to forest land, region of cultivated land transformation to grassland. The areas were nearly balanced on cultivated land transformation to forest land and cultivated land transformation to grassland in the period of 2009-2013. In addition, the results showed farmland decrease was mainly due to the reduction of cultivated land. The cultivated land was the dominant land use type in the transformation by converting into forestland, grassland, rural residential and stripped land, impacted by returning cultivated land to forest land and grassland, occupied construction land and opencast mining damage. The area was 1.01×104 hm2 on cultivated land transformation to forest land and grassland in the period of 1986-2013. The increase of construction land was promoted by urban expansion and land demand for farmers building new houses for improving the living condition and illegal building houses for more land requisition compensation. The area was 0.24 ×104 hm2 on cultivated land transformation to construction land in the period of 1986-2013. Damage land growth was related to the scale enlargement of coal production. The area was 0.37× 104 hm2 on cultivated land transformation to damage land in the period of 1986-2013. The findings can provide references for land sustainable use and protection of ecological environment to the research area. ©, 2015, Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering. All right reserved.


Cao Y.,University of Science and Technology of China | Cao Y.,Key Laboratory of Land Consolidation | Wang J.,University of Science and Technology of China | Wang J.,Key Laboratory of Land Consolidation | And 8 more authors.
Environmental Earth Sciences | Year: 2015

Soil reconstruction on the open-cast mine dump is an important part of land reclamation. This study took soils at the south dump in Antaibao open-cast mine of China Coal Pingshuo Group as the research object and focused on analyzing the physical properties and differentiation mechanisms of the reconstructed soils collected from the dump along the slope and platform of shady slope, half shady slope, sunny slope, and half sunny slope of the open-cast coal mine at the overall level, site level, and terrain level, respectively, during the soil-rock mixture discharge process. The results are following: (1) the variation coefficients of soil bulk density, soil porosity, soil mass water content, as well as soil gravel content are at a state of medium variability. (2) After a long time of vegetation restoration, soil bulk density is decreased, soil porosity is increased, and soil mass water content quality is improved. (3) The physical properties of reconstructed soils at platform are slightly, but not significantly better than those at slope. (4) Most physical properties of the reconstructed soils are significantly different at the slope and aspect levels, but not at the altitude level. (5) At the slope level, the physical properties of reconstructed soils are significantly different between the moderately steep slope and high steep slope. (6) At the aspect level, soil bulk density, soil porosity and soil gravel content sunny slope are obviously different from those at half sunny slope, and soil mass water content at shady slope is significantly different from that at half shaded slope. Lastly, we proposed some specific measures to optimize land reclamation technologies. © 2015, Springer-Verlag Berlin Heidelberg.


Cao Y.,University of Science and Technology of China | Cao Y.,Key Laboratory of Land Consolidation | Bai Z.,University of Science and Technology of China | Bai Z.,Key Laboratory of Land Consolidation | And 10 more authors.
Journal of Food, Agriculture and Environment | Year: 2014

In this study, we collected soils from 11 plots of the reclaimed cropland at a large-scale opencast coal mining area, analysed their profile properties and compared these properties with the properties of undamaged and unreclaimed croplands. These properties were compared using comparative analysis, variance analysis, correlation analysis and principal component analysis to reveal the underlying rules of variation with reclamation years. The results indicate that the soil profile properties of the reclaimed cropland vary significantly with differences in depth, particularly at depths of 30, 40 and 50 cm. In addition to soil organic matter and soil total K, most significant differences among the three types of croplands were soil fertility followed by soil physical indicators. There were positive correlations between soil bulk density and soil pH (p<0.01), between soil field moisture capacity and total phosphorus (p<0.05), between soil organic matter and total nitrogen (p<0.01), between soil organic matter and soil available K (p<0.01) and between soil organic matter and soil total phosphorus (p<0.01). The primary physicochemical factors affecting the properties of soil in reclamation croplands were soil physical and chemical indexes for those croplands that have been reclaimed for 2 years and organic matter and soil nutrients for those croplands that have been reclaimed for 13 years and 18 years, as well as undamaged cropland. The distribution of the physical soil profile and chemical properties of the croplands that have been reclaimed for 13 and 18 years were highly consistent with the properties of the undamaged croplands.

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