| Ecological and climate change at the global and regional scales has long been affected by land use/cover changes.The Land Use/Cover Change(LUCC)study carried out in the mid-1980s proposed that various scientific and technological means should be applied to reconstruct the history of land use change.Reconstructing historical LUCC spatial data with high precision and accuracy can further identify the LUCC process on the basis of supplementing the results of modern remote sensing interpretation,can also provide a reference for land use and climate simulation,and solve global resources,environment,and ecological problems.Under the extensive attention of IGBP's BIOME300,LUCC,GCTE,GLP,iLEAPS and other international research programs and global scholars,land use/cover research based on quantitative and spatial pattern reconstruction have made positive progress,including data sets as SAGE,HYDE,CHCD.Such data sets have important influences,but these research results are mostly based on cultivated land with a certain spatial extent and spatial precision in a long historical period.Historically,China's agricultural civilization was developed.Before the founding of the People's Republic of China,the main source of livelihood for farmers was agricultural production attached to cultivated land.Under the combined effect of internal and external factors such as population growth,agricultural production expansion,economic and social development,and regional linkages,the use ofhistorical rural residential land shows a continuous increase in quantity and spatial expansion,while affecting and restricting social,economic and agricultural development.Rural residential areas are one of the important types of rural land use,and their spatial pattern and change characteristics are important content of the LUCC research.Limited by the self-sufficient agricultural economic form in ancient China,the rural residential land reflects and controls the land use activities in specific areas,but it is characterized by only a few documentary records.Research on the estimation of the area of residential land and the reconstruction of spatial patterns is still rareBased on the analysis of traditional residential culture and development model,combined with quantitative control and spatial allocation criteria,select between 1820-1864,the five typical time sections(1820,1911,1936,1946,and 1964)with rich historical data reconstructed the spatial pattern of rural residential land use under the 100m×100m spatial grid.Select various factors from the aspects of nature,region,and social economy,analyze the influence of various factors on the spatial layout of rural residential areas and evaluate the adaptability of all rural residential land in the four provinces of East China.On this basis,put forward an appropriate optimization mode.Through research draw conclusions as following:(1)The area of rural residential land under each time section is estimated to be 3890.97km2(1820),4821.32km2(1911),6115.44km2(1936),6628.19km2(1946),7384.40km2(1964)respectively.From the perspective of the overall scale and quantity evolution of rural residential land,the area of rural residential land in East China has basically maintained a steady growth trend.The traditional residential land expansion mode is influenced by traditional residential culture,social economy,natural endowment and resource conditions(2)In terms of spatial pattern,the spatial distribution of rural residential land in East China is relatively average,showing a gradual aggregation trend,which is centered on water networks such as the Yangtze River,Huaihe River,Qiantang River,Taihu Lake,Hongze Lake,Chaohu Lake,and West Lake.It is concentrated in the flat zone along with the lake water system;in the spatial expansion,it shows the continuous spread from the plain area to the hilly low mountain area.Its concentration and evolution trend are mainly related to the impact of road traffic,urban construction,and social-economic conditions.Therefore,the distribution and evolution trends of specific regions vary according to the conditions of the region.(3)In the current situation of insufficient historical data,the research results of historical land use space reconstruction are often difficult to directly verify.In order to explain the rationality of the reconstruction results,this study compares the reconstruction results with the 1820 and 1911 data results in the Chinese historical geographic information system database,and the 1930s and 1950s mapping topographic maps through spatial quantity and pattern verification methods.The verification results show that the reconstruction results are consistent with the social changes and historical facts of the study area,and the overall trend is basically the same;the accuracy of reconstruction results in 1820 and 1911 is 61.46%and 68.96%,respectively;the average accuracy of reconstruction results of the six verification areas selected in 1936 is 73.5%;the average accuracy of reconstruction results of the three verification areas selected in 1946 is 69.03%.Overall,the reconstruction accuracy is ideal,the reconstruction accuracy is ideal. |
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