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| DOI：10.13522/j.cnki.ggps.2022102 |
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| Annual Variation in Effective Utilization Coefficient of Irrigation Water and Its Determinants in Jiangsu Province |
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JU Yan, YANG Xing, BI Kejie, WANG Huaichuan, ZHANG Wenye
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1. Jiangsu Hydraulic Research Institute, Nanjing 210017, China;
2. Rural Water and Soil Conservation Department of Wuxi Water Conservancy Bureau, Wuxi 214031, China
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| Abstract: |
| 【Objective】 Improving utilization efficacy of irrigation water ((IWEUC)) is part of sustainable agriculture development. Understanding its determinations and variation is essential to achieving this goal and improving water resources management. In this paper, we analyze the annual variation in IWEUC in Jiangsu province as well as its determinants.【Method】 The analysis considers natural factors, planting structure, management level, and water-saving engineering projects. The factors that impact IWEUC most are investigated using partial correlation analysis and principal component analysis.【Result】 ① IWEUC in Jiangsu province is higher than the rest of the country and does not show insignificant increase from 2014 to 2021. IWEUC and its change is negatively correlated to the size of irrigation districts. ② In terms of irrigation water sources, the IWEUC in gravity-driven irrigation districts has increased more than in other irrigation districts. ③The areas of water-saving engineering projects in an irrigation district impacts IWEUC significantly (P<0.01). The contribution of water-saving engineering projects and natural factors is more than that from others. 【Conclusion】Establishing and improving water conservation system and management and reforming water pricing plays an essential role in optimizing management of irrigation districts, strengthening construction of water-saving engineering projects, and improving IWEUC in Jiangsu province. |
| Key words: irrigation water; effective utilization coefficient; principal component analysis; integrated agricultural water pricing reform; water-saving irrigation; irrigation district |
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