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Index decomposition analysis of urban crop water footprint

Author

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  • Zhao, X.
  • Tillotson, M.R.
  • Liu, Y.W.
  • Guo, W.
  • Yang, A.H.
  • Li, Y.F.

Abstract

Rapid urbanization has resulted in often unplanned increases in population, and food demand in cities. Historically, hinterlands to these cities have acted as breadbaskets producing food to the urban residents. Accordingly, a large amount of available freshwater has been needed to support these croplands. However, the rapid expansion of cities in developing countries has significantly changed both the croplands around cities and the water demand. It is thus important to quantitatively investigate the water-food nexus of cities related to the changing hinterland agriculture. Water footprint is an indicator reflecting the human impact on water. In this study, we quantified both the blue and green water footprint of major crop products in Suzhou city, China using a bottom-up accounting method. A novel decomposition analysis was carried out with a Logarithmic Mean Divisia Index (LMDI) method to study the driving forces that changed the water footprint during the period 2001–2010. The drivers were designed to reflect the factors related to farmland, such as yield and crop area. This is different from previous decomposition analyses, which focused on economic factors such as GDP. The results show that the crop water footprint of Suzhou city has seen a general decreasing trend between 2001 and 2010. The decomposition analysis showed that the decline of crop area was the main driver that decreased the crop water footprint, followed by the virtual water content (water consumption per unit of production). In contrast the changes of crop combination and yield contributed to an increase in the crop water footprint. Although the shrink of urban croplands decreased the water footprint of crop products. Cities’ increasing demand for food will increase the crop water footprint of consumption. This will increase the dependence of cities on external water footprint of crop products (water embodied in imported crops), which may impact upon food security in cities in the long term.

Suggested Citation

  • Zhao, X. & Tillotson, M.R. & Liu, Y.W. & Guo, W. & Yang, A.H. & Li, Y.F., 2017. "Index decomposition analysis of urban crop water footprint," Ecological Modelling, Elsevier, vol. 348(C), pages 25-32.
    • Handle: RePEc:eee:ecomod:v:348:y:2017:i:c:p:25-32
    DOI: 10.1016/j.ecolmodel.2017.01.006
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    References listed on IDEAS

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    Cited by:

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    2. Zuxuan Song & Fangmei Liu & Wenbo Lv & Jianwu Yan, 2023. "Classification of Urban Agricultural Functional Regions and Their Carbon Effects at the County Level in the Pearl River Delta, China," Agriculture, MDPI, vol. 13(9), pages 1-29, September.
    3. Lei Liu & Tong Wu & Zhihang Xu & Xiaofeng Pan, 2018. "The Water-Economy Nexus and Sustainable Transition of the Pearl River Delta, China (1999–2015)," Sustainability, MDPI, vol. 10(8), pages 1-15, July.
    4. Yuanhong Tian & Matthias Ruth & Dajian Zhu & Jinfeng Ding & Nicholas Morris, 2019. "A Sustainability Assessment of Five Major Food Crops’ Water Footprints in China from 1978 to 2010," Sustainability, MDPI, vol. 11(21), pages 1-20, November.
    5. Zhang, Chenjun & Wu, Yusi & Yu, Yu, 2020. "Spatial decomposition analysis of water intensity in China," Socio-Economic Planning Sciences, Elsevier, vol. 69(C).
    6. Magdalena Karwacka & Agnieszka Ciurzyńska & Andrzej Lenart & Monika Janowicz, 2020. "Sustainable Development in the Agri-Food Sector in Terms of the Carbon Footprint: A Review," Sustainability, MDPI, vol. 12(16), pages 1-17, August.
    7. Guojing Li & Xinru Han & Qiyou Luo & Wenbo Zhu & Jing Zhao, 2021. "A Study on the Relationship between Income Change and the Water Footprint of Food Consumption in Urban China," Sustainability, MDPI, vol. 13(13), pages 1-16, June.
    8. Meng, Fanxin & Liu, Gengyuan & Chang, Yuan & Su, Meirong & Hu, Yuanchao & Yang, Zhifeng, 2019. "Quantification of urban water-carbon nexus using disaggregated input-output model: A case study in Beijing (China)," Energy, Elsevier, vol. 171(C), pages 403-418.
    9. Changfeng Shi & Hang Yuan & Qinghua Pang & Yangyang Zhang, 2020. "Research on the Decoupling of Water Resources Utilization and Agricultural Economic Development in Gansu Province from the Perspective of Water Footprint," IJERPH, MDPI, vol. 17(16), pages 1-16, August.

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