
Reconstruction of Lu-level cropland areas in the Northern Song Dynasty (AD976-1078)
Fanneng HE, Meijiao Li, Shicheng Li
Journal of Geographical Sciences ›› 2017, Vol. 27 ›› Issue (5) : 606-618.
Reconstruction of Lu-level cropland areas in the Northern Song Dynasty (AD976-1078)
Based on data on taxed-cropland area and on the number of households in historical documents, a probabilistic model of cropland distribution and a cropland area allocation model were designed and validated. Cropland areas for the years AD976, 997, 1066, and 1078 were estimated at the level of Lu (an administrative region of the Northern Song Dynasty). The results indicated that (1) the cropland area of the whole study region for AD976, 997, 1066, and 1078 was about 468.27 million mu (a Chinese unit of area, with1 mu=666.7m2), 495.53 million mu, 697.65 million mu, and 731.94 million mu, respectively. The fractional cropland area (FCA) increased from 10.7% to 16.8%, and the per capita cropland area decreased from 15.7 mu to 8.4 mu. (2) With regard to the cropland spatial pattern, the FCA of the southeast, north, and southwest regions of the Northern Song territory increased by 12.0%, 5.2%, and 1.2%, respectively. The FCA of some regions in the Yangtze River Plain increased to greater than 40%, and the FCA of the North China Plain increased to greater than 20%. However, the FCA of the southwest region (except for the Chengdu Plain) in the Northern Song territory was less than 6%. (3) There were 84.2% Lus whose absolute relative error was smaller than 20% in the mid Northern Song Dynasty. The validation results indicate that our models are reasonable and that the results of reconstruction are credible.
land use/cover change / cropland area / Lu-level reconstruction / spatial-temporal characteristics / Northern Song Dynasty {{custom_keyword}} /
Table 1 National-level taxed-cropland area and the number of households in the Northern Song Dynasty |
Year | Number of households (104) | Taxed-cropland area (106 Song-mu) |
---|---|---|
AD976 | 309.1 | 295.33 |
AD997 | 413.3 | 312.53 |
AD1021 | 867.8 | 524.76 |
AD1051 | — | 228.00 |
AD1066 | 1291.7 | 440.00 |
AD1083 | 1721.2 | 461.66 |
Song-mu: area unit of the Northern Song Dynasty, 1 Song-mu=584.0 m2 (Wu, 2006). |
Figure 2 Scheme for reconstruction of cropland area at the Lu level in the Northern Song Dynasty |
Figure 3 Preliminary revised results for cropland area per household in each Lu in the mid Northern Song Dynasty |
Table 2 Estimates of cropland area in five Lus in the mid Northern Song Dynasty |
Lu | Pre-revision results (106 Song-mu) | Number of families (104) | Re-estimated results (106 Song-mu) |
---|---|---|---|
Zizhou | 2.84 | 47.8 | 9.56 |
Lizhou | 2.49 | 37.2 | 7.45 |
Kuizhou | 0.43 | 25.4 | 7.63 |
Guangnandong | 6.07 | 57.9 | 11.59 |
Guangnanxi | 0.11 | 23.8 | 7.15 |
Figure 4 Fitting curve between cropland proportion and population proportion in the mid Northern Song Dynasty |
Figure 5 Absolute relative error of our reconstruction results in the mid Northern Song Dynasty |
Table 3 Reconstruction results of cropland area and population for the Northern Song Dynasty |
Year | Cropland area (106mu) | Fractional cropland area (%) | Population (104) | Per capita cropland area (mu) | |
---|---|---|---|---|---|
AD976 | 468.27 | 10.8 | 2982.7 | 15.7 | |
AD997 | 495.53 | 11.4 | 3988.5 | 12.4 | |
AD1066 | 697.65 | 16.1 | 6791.9 | 10.3 | |
AD1078 | 731.94 | 16.9 | 8730.4 | 8.4 |
Figure 6 Fractional cropland area for AD976, 997, 1066, and 1078 in the Northern Song Dynasty |
Figure 7 FCA changes in each region of the Northern Song Dynasty during AD976-1078 |
Figure 8 Comparison of reconstructed cropland areas in the mid Northern Song Dynasty at the Lu level |
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The authors have declared that no competing interests exist.
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