| Autor: |
ZHANG Huiru, XU Hang, SONG Jianfeng |
| Jazyk: |
čínština |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Guan'gai paishui xuebao, Vol 40, Iss 8, Pp 129-135 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
1672-3317 |
| DOI: |
10.13522/j.cnki.ggps.2020416 |
| Popis: |
【Background】 Agriculture is the largest water-use sector in China and reducing agricultural water use is hence critical to ameliorating the impact induced by water shortage and sustaining its economic development. One problem facing implementation of water-saving irrigation and other agronomic practices is that these technologies might fail to meet the designed targets, resulting in what is called “irrigation water use rebound”. 【Objective】 This paper aims to examine the factors behind the irrigation water use rebound with a view to providing guidance to help optimize water resource allocation and sustain water utilization in implementing water-saving policies. 【Method】 The analysis was based on an agricultural production function by integrating irrigation water use with other factors including agricultural production technologies and labor input. We then build a benchmark platform comprising pooled regression model, determinant effect model, random effect model, and binary choice model to analyze the factors which were most likely to have led to the irrigation water use rebound at metropolitan scale in the five provinces in northwestern China. 【Result】 Crop yield and irrigation water productivity affected irrigation water use rebound the most. The increase in crop yield had a positive effect on irrigation water use rebound, while increasing irrigation water productivity dampens this rebound. About 65% of cities in northwestern China have seen irrigation water use rebound, meaning that the increase in irrigation water use is common in this region. The results calculated from the benchmark platform indicated that irrigation water use rebound increased by 0.094 3%~0.611 3% for every 1% increase in crop yield; when other conditions were the same, irrigation water use rebound was reduced by 0.927 3%~0.990 1% for every 1% increase in irrigation water productivity. The results calculated by the binary choice model were consistent with that from the benchmark platform, indicating that the above results were robust. 【Conclusion】 Irrigation water use rebound in northwestern China was induced by the increase in crop yield after implementation of other improved agricultural practices. Water-saving policies in the future should focus on disseminating water-saving technologies, improving irrigation water productivity, and helping farmers to appreciate the importance and benefits of reducing agricultural water use. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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