Spatiotemporal Variation Characteristics of Green Water Resource Consumption and Utilization Efficiency in Jiangxi Province
[Objective] This study aims to conduct an in-depth analysis of the spatiotemporal variation characteristics of green water resource consumption and utilization efficiency in Jiangxi Province over the past two decades (2001-2020) to provide scientific support for regional water resource management an...
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Journal of Changjiang River Scientific Research Institute
2025-08-01
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| Series: | 长江科学院院报 |
| Subjects: | |
| Online Access: | http://ckyyb.crsri.cn/fileup/1001-5485/PDF/1735798879648-1091969661.pdf |
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| Summary: | [Objective] This study aims to conduct an in-depth analysis of the spatiotemporal variation characteristics of green water resource consumption and utilization efficiency in Jiangxi Province over the past two decades (2001-2020) to provide scientific support for regional water resource management and agricultural policy making. [Methods] We calculated green water utilization efficiency using two key datasets: (1) the transpiration-to-evapotranspiration ratio dataset (2001-2020) from China’s National Ecological Science Data Center, and (2) annual net primary productivity estimates derived from the MYD17A3H.006 remote sensing product. The Mann-Kendall trend analysis method was then applied to quantitatively evaluate the spatiotemporal trends in green water consumption and utilization efficiency across Jiangxi Province. [Results] From 2001 to 2020, total green water consumption in Jiangxi Province ranged from 796 to 965 mm, with an average of 887.75 mm, showing a significant downward trend at a rate of 5.26 mm/a. Productive green water consumption ranged from 519.12 to 692.53 mm, averaging 614.95 mm, and also showed a clear decreasing trend at 1.73 mm/a. Non-productive green water consumption ranged from 230.64 to 356.30 mm, with an average of 272.79 mm, showing a relatively significant downward trend at 3.53 mm/a. The annual green water utilization efficiency ranged from 0.67 to 0.81 g C/(kg H2O), with a multi-year average of 0.74 g C/(kg H2O), demonstrating a significant increasing trend at 0.006 7 g C/((kg H2O)·a). Spatially, both total green water consumption and productive green water consumption exhibited a distribution pattern of higher values in the south and lower values in the north, with the highest observed in Ganzhou. Productive green water consumption showed an increasing trend around the Poyang Lake area, while most other regions exhibited decreasing trends. Total green water consumption showed an extremely significant decreasing trend across all regions, except in parts of Jiujiang and Jingdezhen. Across 92.70% of the province, green water utilization efficiency exhibited varying degrees of increase, with Ji’an and Yichun showing extremely significant improvements. [Conclusion] The decline in total green water consumption and the improvement in its utilization efficiency demonstrate notable achievements in water resources management and water-saving practices in Jiangxi Province. Future efforts should focus on optimizing water allocation, promoting water-saving irrigation technologies, and adopting high-efficiency cultivation practices to further enhance green water utilization efficiency in response to challenges posed by climate change and human activities. |
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| ISSN: | 1001-5485 |