| Human-induced land use/cover change (LUCC) affects the climatic and ecological process at global and regional scale. It is an important driving force of global environmental change and has become a central issue of the international community. Historical land use and land cover change is a key issue of LUCC research. The reconstruction the historical land use spatial data can help to replenish modern remote sensing data and acutely identify long-term LUCC process. It will also provide reference and basis for future land use and climate modeling, policy development and regional sustainable development. Considering some existing research have features as limited land use type, less rigorous literature research and reasonable amendment process, too large spatial grid establishment and difficulty of reflecting the actual characteristics of the land use, universal theoretical assumptions and design rules and less consideration of regional differences, reconstructing historical land use and land cover of Jiangsu Province has its theoretical and practical significance.This study followed the ideas of inversion on the foundation of modern land use pattern. Forever, the research thoroughly considered the characteristics of regional natural resources and historical reality and combined with geographic boundaries limit. The time section was 1820 for its detailed land use data, demographic data and other proxy data and the study area was agriculture developed Jiangsu province. The data used were remote sensing images, DEM data, historical geography relevant outcomes, and other statistical data. This study proposed theoretical assumptions and further emended prefectural cropland, urban land and rural residential land areas. In addition, the research had multiple indicators analysis and quantification from the perspective of the relationship between people and land. Then, after using entropy-weight method to construct comprehensive evaluation model, land use pattern in Jiangsu Province in 1820 was gridding reconstructed. Ultimately, the comparison validation proved the results were reliable.The main conclusions of this study are as follows:(1) By undertaking merging adjustments, the classifications of land type are divided into 4 first-class land use types as cropland, settlement, water and other lands (forest, grassland and unused land). Among them, settlement divides into 2 second-class land use types as urban land and rural residential land.(2) This study Amends the urban population in 1820, further calculates the non-agricultural population by total population in 1820 and compares with the non-agricultural population in 1984 in the same administrative boundaries. We obtain the prefectural rural residential land area based on a fixed per capita rural residential land area. Sort the reconstructed rural residential land area in descending order, and the results are 86,979 hm2,77,086 hm2,68,303 hm2,61,338 hm2,42,774 hm2,37, 359 hm2,28,662 hm2,19,650 hm2,15,951 hm2,15,217 hm2,5,641 hm2 and 1,952 hm2, corresponding to Jiangning Prefecture, Huaian Prefecture, Xuzhou Prefecture, Yangzhou Prefecture, Suzhou Prefecture, Haizhou, Changzhou Prefecture, Zhenjiang Prefecture, Sizhou, Tongzhou, Haimen Prefecture and Taicang Prefecture.(3) Previously studied as a reference, according to the urban population proportion (including with Fuguo County and the general county), we reconstruct the urban land area in 1820. The results are:Jiangning Prefecture is 6,000 hm2, Yangzhou Prefecture is 1,602 hm2, Suzhou Prefecture is 1,457 hm2, Huaian Prefecture is 874 hm2, Zhenjiang Prefecture is 437 hm2, Changzhou Prefecture and Xuzhou Prefecture, Tongzhou, Haimen Prefecture, haizhou and Taicang Prefecture is 146 hm2, each Fuguo County is 125 hm2, each General County in Jiangsu Province is 100 hm2 and Xuyi County in Anhui Provinve is 83 hm2.(4) Taking into account the prefectural cropland change in the two time sections are relatively consistent, the equal proportional method is used to reconstruct of the prefectural cropland, and the inconsistent regional administrative boundaries are corrected. Sort the prefectural reconstructed cropland area in descending order, and the results are 818,085 hm2,767,443 hm2,762,175 hm2,613,641 hm2,589,544 hm2,386,316 hm2,340,015 hm2,253,662 hm2,248,541 hm2,151,671 hm2 and 55, 173 hm2, corresponding to Huaian Prefecture, Xuzhou Prefecture, Yangzhou Prefecture, Tongzhou and Haimen Prefecture combined, Haizhou, Changzhou Prefecture, Suzhou Prefecture, Zhenjiang Prefecture, Jiangning Prefecture, Sizhou, and Taicang Prefecture.(5) Based on natural, social and economic factors, selected quantitative indicators, we build suitability evaluation models, used entropy-weight method, undertake normalization work and obtain the results. In residential suitability evaluation, the weights of rural residential level, slope, distance from the nearest villages and small towns, distance from the nearest river, and distance from the nearest county seat each are 0.340,0.256,0.114,0.112,0.100 and 0.077. In cropland suitability evaluation, the weights of elevation, slope, distance from the nearest villages and small towns, distance from the nearest river, soil texture, soil organic matter, total nitrogen, total phosphorus, cropland contiguous properties, pH, and total potassium each are 0.408,0.168,0.151,0.133,0.031,0.029,0.024,0.019,0.017, 0.015 and 0.006. We obtain the water raster data from CHGIS data conversion and data resampling. The other lands raster data is done by decucting the settlement, cropland and water grids from the total grids. After overlaying, we ultimately obtain the 100m×100m spatial pattern of land use of the study area in 1820.(6) For lacking of corresponding data of historical land use spaital pattern, this study use downscaling analysis to test the reconstruction results. After Regional count the grids of 1820 and 1985 in the units of county and city of 1985, it shows that the proportions of rural residential land and cropland areas in each county occupies the corresponding city in the two years all have significant linear relationships. Thus, the reconstruction results of land use in Jiangsu Province in 1820 based on this study’s methods are reliable to a certain extent. |
PDF Full Text Request