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| Rozelle, Scott; Deng, Xiangzheng; Huang, Jikun; Uchida, Emi. |
| In China, there is a growing debate on the role of cultivated land conversion on food security. This paper examines the changes of the area of cultivated land and its potential agricultural productivity in China using satellite images. We find that between 1986 and 2000, China recorded a net increase of cultivated land (+1.9%), which almost offset the decrease in average potential productivity, or bioproductivity (-2.2%). Therefore, we conclude that conversion of cultivated land did not hurt China's national food security. We also show that more recent change in cultivated area also should have little adverse effect on food security. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Land Economics/Use. |
| Ano: 2005 |
URL: http://purl.umn.edu/19323 |
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| Olivia, Susan; Gibson, John; Smith, Aaron D.; Rozelle, Scott; Deng, Xiangzheng. |
| Poverty maps provide information on the spatial distribution of welfare and can predict poverty levels for small geographic units like counties and townships. Typically regression methods are used to estimate coefficients from the detailed information in household surveys, which are then applied to the more extensive coverage of a census. One problem with standard regression techniques is that they do not take into account the ‗spatial dependencies‘ that often exist in the data. Ignoring spatial autocorrelation in the regression providing the coefficient estimates could lead to misleading predictions of poverty, and estimates of standard errors. Household survey data usually lack exact measures of location so it is not possible to fully account for this... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: China; Poverty; Small Area Estimation; Survey Methods; Spatial Models. |
| Ano: 2009 |
URL: http://purl.umn.edu/47651 |
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