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Arable land use intensity change in China from 1985 to 2005: evidence from integrated cropping systems and agro economic analysis

Published online by Cambridge University Press:  03 June 2011

D. ZHOU ,
P. AN ,
Z. PAN  and
F. ZHANG
D. ZHOU
Affiliation:
College of Resources and Environment Science, China Agricultural University, Yuanmingyuan West Road, Haidian District, Beijing 100193, P.R. China
P. AN*
Affiliation:
College of Resources and Environment Science, China Agricultural University, Yuanmingyuan West Road, Haidian District, Beijing 100193, P.R. China
Z. PAN
Affiliation:
College of Resources and Environment Science, China Agricultural University, Yuanmingyuan West Road, Haidian District, Beijing 100193, P.R. China
F. ZHANG
Affiliation:
College of Resources and Environment Science, China Agricultural University, Yuanmingyuan West Road, Haidian District, Beijing 100193, P.R. China
*
†To whom all correspondence should be addressed. Email: anpl@cau.edu.cn
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Summary

A cropping system is the consequence of environmental and socio-economic conditions that determine the intensity of agricultural land use. Accurate information on regional land use intensity and changes in land use intensity is important for food security and sustainable resource management in China. Therefore, a better understanding of the spatial and temporal changes in arable land use intensity (ALUI) based on the cropping system used is essential to comprehend the changes in land use and the sustainability of the food system. The purpose of the present study was to investigate the spatial difference in ALUI and how it has changed in China by comparing data on cropping systems from 1985 and 2005. The basic cropping system data were acquired from the 1985 reference book and the 2005 national land use investigation. The ALUI was defined by the application of inputs (irrigation water and fertilizer) to arable land and the duration of disturbances (the duration of cultivation and the frequency of cropping), and it was calculated using the information entropy approach at the cropping region scale (cropping region being defined by the geographical and climatic conditions at the beginning of the 1980s). Spatial and temporal changes in the ALUI in China over the past two decades were observed and analysed. The results indicated a clear pattern in ALUI, increasing from the north to the south in 2005. Furthermore, the ALUI significantly increased after the 1980s, but the rate of increase was lower in the south than in the north. The most intensive land use in 1985 was in the area of the lower reach of the Yangtze and Huai Rivers, and it expanded northwards towards the Huang-Huai-Hai plain in 2005. The large increase in intensity in the northern single-cropping regions was strongly associated with a rapid increase in inputs and longer duration of cultivation. Decreases in duration of cultivation and planting area helped slow the ALUI increase in multiple cropping regions, which were concentrated in coastal and economically developed regions where more fertile soil and suitable climates existed, allowing the growth of multiple crops. These results suggested that a decrease in the planting area and a slow increase in the ALUI in the lower reaches of the Yangtze River, South China, Southeast China and Northeast China should be of concern, but land use in some western regions should maintain the land production capacity to build sustainable cropping. In the future, it will be necessary to produce more food in a more sustainable way.

Type
Climate Change and Agriculture
Information
The Journal of Agricultural Science , Volume 150 , Issue 2 , April 2012 , pp. 179 - 190
Copyright
Copyright © Cambridge University Press 2011

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