| This article has been：Browse 472Times Download 423Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2022320 |
|
| Change in Irrigation Water Usage in Jiangsu Province and the Underlying Reason |
|
WANG Hao, YI Peng
|
|
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
|
| Abstract: |
| 【Objective】Agriculture is the greatest water consumer. Reducing irrigation water usage is hence a priority in developing sustainable agriculture for many countries. While developing water-saving irrigation technologies is essential to achieving this goal, changing social activity and national and international trade can also play an important role. Taking Jiangsu province as an example, this paper analyzes the impact of non-technological factors on reducing irrigation water usage over the past 20 years. 【Method】The CropWat model was used to calculate the change in water used for irrigation from 2002 to 2017 first. The results were then combined with a structural decomposition model to analyze the driving forces behind the change in irrigation water usage, from which we calculated the contribution of different factors to the changes. Based on an input-output table, we also analyzed the role of industrial and trade economies in reducing irrigation water.【Result】Change in agricultural production structures and food consumption was the key factors holding the increase in irrigation water usage over the past two decades, with the former reducing irrigation water usage by 19.29 billion m3 and the latter by 10.62 billion m3, during the studied period. The development of food industry combined with international trading by importing water-consuming cash crops over the past two decades also helped reduce the irrigation water usage.【Conclusion】The key to achieving water saving through changing economic policies is to restructure agricultural production chains and reducing cultivation of high-water-consuming crops. |
| Key words: structural decomposition model; irrigation; water saving; input-output model |
|
|
