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Research ArticleResearch Section

Trade-off analysis of water conservation and water consumption of typical ecosystems at different climatic scales in the Dongjiang River basin, China

Y. Luo, K. Zhu, X. Qiu, C. Zang, X. Lu, M. Dai, W. Zhang and X. Gan
Journal of Soil and Water Conservation March 2023, 00106; DOI: https://doi.org/10.2489/jswc.2023.00106
Y. Luo
are students
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K. Zhu
are students
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X. Qiu
are students
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C. Zang
(corresponding author) is an associate professor, School of Geography, South China Normal University, Guangzhou, China
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X. Lu
are students, School of Geography, South China Normal University, Guangzhou, China.
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M. Dai
are students, School of Geography, South China Normal University, Guangzhou, China.
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W. Zhang
is a researcher Guangdong Academy of Forestry, Guangzhou, China, and Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization.
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X. Gan
(corresponding author) is a researcher, Guangdong Academy of Forestry, Guangzhou, China, and Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization.
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Abstract

Water conservation is one of the most crucial ecosystem service functions and key to evaluating watershed protection and development. Water consumption is an important part of the water cycle and maintains ecosystem stability. The trade-off relationship between water conservation and water consumption in ecosystems at different climatic scales is a significant scientific issue in hydrological studies. The Dongjiang River basin has a very important strategic position and supplies water to the eastern part of Guangdong Province and Hong Kong. This study conducted a trade–off analysis of the water conservation and water consumption of typical ecosystems in the Dongjiang River basin at different climatic scales using the Soil and Water Assessment Tool (SWAT) model. The results revealed that first, the amount of water conserved in the Dongjiang River basin was far less than that consumed over the past 50 years. Regarding typical meteorological years, water consumption followed the order of wet year > normal year > dry year. Second, the average amounts of annual, wet season, and dry season water consumption were 22.611, 17.943, and 4.668 Bm3, respectively, whereas the average amounts of water conservation were 1.198, 1.609, and −0.411 Bm3, respectively. The water conservation and water consumption of different ecosystems fluctuated significantly between the dry and wet seasons, with stronger fluctuation in the dry season. Third, in terms of ecosystem types, water conservation followed the order of arbor forest > paddy field > other forest > grassland > dry cropland, and water consumption followed the order of arbor forest > other forest > paddy field > grassland > dry cropland. Lastly, the meteorological factor driving changes in water conservation was precipitation, and the factors influencing changes in water consumption were temperature and precipitation. This study can provide theoretical reference for ecosystem protection and sustainable management of water resources, and the results and conclusions have great significance to developments in hydrological research.

Key words:
  • Dongjiang River basin
  • typical ecosystems
  • typical meteorological year
  • water conservation
  • water consumption
  • © 2023 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 78 (3)
Journal of Soil and Water Conservation
Vol. 78, Issue 3
May/June 2023
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Trade-off analysis of water conservation and water consumption of typical ecosystems at different climatic scales in the Dongjiang River basin, China
Y. Luo, K. Zhu, X. Qiu, C. Zang, X. Lu, M. Dai, W. Zhang, X. Gan
Journal of Soil and Water Conservation Mar 2023, 00106; DOI: 10.2489/jswc.2023.00106

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Trade-off analysis of water conservation and water consumption of typical ecosystems at different climatic scales in the Dongjiang River basin, China
Y. Luo, K. Zhu, X. Qiu, C. Zang, X. Lu, M. Dai, W. Zhang, X. Gan
Journal of Soil and Water Conservation Mar 2023, 00106; DOI: 10.2489/jswc.2023.00106
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Keywords

  • Dongjiang River basin
  • typical ecosystems
  • typical meteorological year
  • water conservation
  • water consumption

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