Streamflow regimes of the Yanhe River under climate and land use change, Loess Plateau, China

  • Gao P
  • Jiang G
  • Wei Y
 et al. 
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Soil and water conservation measures including terracing, afforestation, construction of sediment-trapping dams, and the ‘Grain for Green Program’ have been extensively implemented in the Yanhe River watershed, of the Loess Plateau, China, over the last six decades, and have resulted in large-scale land use and land cover changes. This study examined the trends and shifts in streamflow regime over the period of 1953–2010 and relates them to changes in land use and soil and water conservation and to the climatic factors of precipitation and air temperature. The non-parametric Mann–Kendall test and the Pettitt test were used to identify trends and shifts in streamflow and base flow. A method based on precipitation and potential evaporation was used to evaluate the impacts of climate variability and changes in non-climate factors changes on annual streamflow. A significant decrease (p=0.01) in annual streamflow was observed related to a significant change point in 1996, mostly because of significant decreases in streamflow (p=0.01) in the July to September periods in subsequent years. The annual base flow showed no significant trend from1953 to 2010 and no change point year,mostly because there were no significant seasonal trends, except for significant decreases (p=0.05) in the July to September periods. Therewas no significant trend for precipitation over the studied time period, and no change pointwas detected. The air temperature showed a significant increasing trend ( p

Author-supplied keywords

  • Change point
  • Soil and water conservation
  • Streamflow regime
  • The Loess Plateau
  • Trend

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