Inter-annual variation and influencing factors of irrigation water use efficiency in the hilly and mountainous regions in Southwest China

• Published in: Guanʻgai paishui xuebao Vol. 44; no. 8; pp. 104 - 113
• Main Authors: HUANG Wenlin, SHAO Jing’an, WANG Chi, SHI Liwei, DAI Xiuying, LI Wei
• Format: Journal Article
• Language: Chinese
• Published: Science Press 01.08.2025
• Subjects: agricultural irrigation; irrigation water effective utilization coefficient; irrigation districts; principal component analysis; water-saving irrigation; the hilly and mountainous region of southwest china
• ISSN: 1672-3317
• DOI: 10.13522/j.cnki.ggps.2024398

【Objective】In the hilly and mountainous regions of Southwest China, improving irrigation efficiency is critical due to their complex terrains. This paper studies the inter-annual variation in irrigation water effective utilization coefficient (IWEUC) in these regions and identifies its main influencing factors.【Method】Taking Chongqing in the region as the study area, inter-annual changes in IWEUC were analyzed using data measured across 79 irrigation districts. Nine influencing factors categorized into four groups: natural conditions, resource availability, management practices and engineering infrastructure were selected in the analysis. Principal component analysis (PCA) was used to identify the dominant factors that influence IWEUC. 【Result】 ① IWEUC in Chongqing is lower than the national average due to the difficulty of implementing efficient irrigation in its mountainous terrains. While IWEUC has been growing over time, the growing rate has slowed in recent years. Spatially, IWEUC ranked from highest to