Vol14 No.10: 2028-2041
【Title】Impacts of precipitation variation and soil and water conservation measures on runoff and sediment yield in the Loess Plateau Gully Region, China
【Author】XIA Lu1; SONG Xiao-yu1*; FU Na1; MENG Chun-fang1, 2; LI Huai-you3; LI Yao-lin3
【Addresses】1 State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an 710048, China; 2 Xinxiang Hydrology and Water Resources Survey Bureau, Xinxiang 453000, China; 3 Xifeng Scientific Experiment Station of soil and water conservation, Yellow River conservancy committee, Xifeng 745000, China
【Citation】Xia L, Song XY, Fu N, et al. (2017) Impacts of precipitation variation and soil and water conservation measures on runoff and sediment yield in the Loess Plateau Gully Region, China. Journal of Mountain Science 14(10). https://doi.org/10.1007/s11629-016-4173-2
【Abstract】The Loess Plateau of China has experienced a lengthy drought and severe soil erosion. Changes in precipitation and land use largely determine the dynamics of runoff and sediment yield in this region. Trend and mutation analyses were performed on hydrological data (1981–2012) from the Yanwachuan watershed in the Loess Plateau Gully Region to study the evolution characteristics of runoff and sediment yield. A time-series contrasting method also was used to evaluate the effects of precipitation and soil and water conservation (SWC) on runoff and sediment yield. Annual sediment yield declined markedlyfrom 1981 to 2012 although there was no significant change in annual precipitation and annual runoff. Change points of annual runoff and annual sediment yield occurred in 1996 and 1997, respectively. Compared with that in the baseline period (1981–1996), annual runoff and annual sediment yield in the change period (1997–2012) decreased by 17.0% and 76.0%, respectively, but annual precipitation increased by 6.3%. Runoff decreased in the flood season and normal season, but increased in the dry season, while sediment yield significantly declined in the whole study period. The SWC measures contributed significantly to the reduction of annual runoff (137.9%) and annual sediment yield (135%) and were more important than precipitation. Biological measures (forestland and grassland) accounted for 61.04% of total runoff reduction, while engineering measures (terraces and dams) accounted for 102.84% of total sediment yield reduction. Furthermore, SWCmeasures had positive ecological effects. Thisstudy provides a scientific basis for soil erosion control on the Loess Plateau.
【Keywords】Quantitative impact; Trend analysis;Evolution characteristics;Runoffand sediment yield; Rainfall; Land use change