Reconstruction of cropland spatial patterns in 733 AD in the Yellow River-Huangshui River Valley
Reconstruction of high-resolution land use/land cover changes in typical region in the historical periods is of great significance to the study of past global environmental changes and global climate.It was a time node that cropland in the Tang Dynasty was the largest and the most efficient on record.Here,we collected and organized data on cropland area from historical documents during the Tang Dynasty to reconstruct the historical cropland spatial distribution of the Yellow River-Huangshui River valley (YHV)on the Qinghai-Tibetan Plateau.We combined this with the actual distribution situation of cropland in the historical period and adjusted the distribution of settlement for a second time to reproduce the spatial distribution pattern of farmland resources in the Tang Dynasty.The results showed that cropland in the YHV in the Tang Dynasty were dominated by military Mita,it was a total of 123 Tun and the total area was 321.13km2.From analysis of cropland distribution,the spread of arable land mainly took the settlement as the center,and took the main river as the center line,and was distributed intensively in the basin of the Huangshui River and Yellow River valley area.Limited by altitude,mountainous terrain factors and a low population meant that only 11.7％ of regional grids were cropland.The reclamation index was very low and influenced by natural environment factors and social productivity.It was in the early stages of agricultural development.The average reclamation rate of cropland was 9.2％,and the highest rate was 18.9％.For 31.4％ of all grids the reclamation rate was less than 9％;67.6％ of all grids had a reclamation index from 9％～15％ and only 1％ of all grids had a reclamation index which was from 15％～20％.The distribution of reclamation intensity was different among administrative units:the reclamation index was highest in Shanzhou where the average reclamation index was nearly 13％;the reclamation index in Kuozhou was far lower;and the reclamation index was lowest in Xishi region which was located in the south of the YHV.
croplandspatial patternsreconstructionYellow River-Huangshui River valleyA.D.733
NETL
NSTL
万方数据
维普
