Acta Geographica Sinica ›› 2012, Vol. 67 ›› Issue (9): 1190-1200.doi: 10.11821/xb201209004

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Comparisons of Reconstructed Cropland Area from Multiple Datasets for the Traditional Cultivated Region of China in the Last 300 Years

HE Fanneng1, LI Shicheng1,2, ZHANG Xuezhen1, GE Quansheng1, DAI Junhu1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2012-06-18 Revised:2012-07-22 Online:2012-09-20 Published:2012-09-20
  • Supported by:

    China Global Change Research Program, No.2010CB950901; National Natural Science Foundation of China, No.40971061; No.41001122

Abstract: Land cover change is an important boundary condition in climate and ecological simulations. Although they have been widely used in researches, SAGE and HYDE, the two global scale historical land use datasets, have been rarely discussed about their rationality and accuracy in regional scale. On the basis of CHCD, the historical cropland dataset of traditional cultivated region of China (TCRC, hereafter) which was established by Chinese scholars, we analyzed the rationality and accuracy of TCRC part of SAGE (2010) and HYDE3.1 by comparing them with CHCD in the whole study area scale, provincial scale and 60 km × 60 km grid cell scale. The results indicated that (1) TCRC part of SAGE (2010) dataset was established by linear interpolation and the average annual growth rate was 0.51% from 1700 to 1950 and -0.34% after 1950. The normalized trend could not reflect TCRC's history of cultivation, and the estimation of cropland area was obviously high compared with CHCD dataset. (2) In comparison of more regional research results, HYDE3.1 dataset was very close to CHCD dataset in the whole study area scale. However, there were significant differences between HYDE3.1 and CHCD in provincial and 60 km×60 km grid cell scales. The percentages of grid cells whose relative differences are greater than 70% (<-70% or > 70%) and 90% (<-90% or >90%) were 56%~63% and 40%~45% respectively while those whose relative difference ranges from -10% to 10% and from -30% to 30% were only 5%~ 6% and about 17%, respectively. (3) Making full use of abundant historical archives in China and establishing historical land use dataset of China with high accuracy are significant ways of improving the quality of climate and ecological simulation results.

Key words: cropland datasets, comparisons, traditional cultivated region of China, past 300 years