Estimation of land production and its response to cultivated land conversion in North China Plain |
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| Authors: | Qun’ou Jiang Xiangzheng Deng Jinyan Zhan Shujin He |
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| Institution: | (1) University of Alaska, Fairbanks, AK, USA |
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| Abstract: | Food safety and its related influencing factors in China are the hot research topics currently, and cultivated land conversion
is one of the significant factors influencing food safety in China. Taking the North China Plain as the study area, this paper
examines the changes of cultivated land area using satellite images, estimates land productivity from 1985 to 2005 using the
model of Estimation System for Land Productivity (ESLP), and analyzes the impact of cultivated land conversion on the land
production. Compared with the grain yield data from statistical yearbooks, the results indicate that ESLP model is an effective
tool for estimating land productivity. Land productivity in the North China Plain showed a slight decreasing trend from 1985
to 2005, spatially, increased from the north to the south gradually, and the net changes varied in different areas. Cultivated
land area recorded a marginal decrease of 8.0 × 105 ha, mainly converted to other land uses. Cultivated land conversion had more significant negative impacts on land production
than land productivity did. Land production decreased by about 6.48 × 106 t caused by cultivated land conversion between 1985 and 2005, accounting for 91.9% of the total land production reduction.
Although the land productivity increased in Anhui and Jiangsu provinces, it can not offset the overall adverse effects caused
by cultivated land conversion. Therefore, there are significant meanings to control the cultivated land conversion and improve
the land productivity for ensuring the land production in the North China Plain. |
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