Spatial-temporal succession characteristics of soil and water loss in the central Loess Plateau during the last 50 years

The Loess Plateau is one of the most serious regions of soil and water loss in China.Soil and water loss has changed extremely with the global climate change and rebuilding of LUCC in the last 50 years.Depth of annual runoff and annual erosion modulus were chosen as the indicators of soil and water loss, and the succession of soil and water loss in four typical morphogenetic zones in the central Loess Plateau during last 50 years was analyzed by Fourier transform.Based on this, period models were created to predict soil and water loss by spectrum analysis.The results showed that soil and water loss did not change significantly in the loess hilly zone and it decreased in the loess gully zone and loess-rock mountain zone, while it increased in the loess mountain zone.Periods of 20-21 years, 6-7 years and 2-4 years in the change of soil and water loss existed in all morphogenetic zones of the Loess Plateau.It is a good way to predict the succession trend of soil and water loss by mixed model of period change and multi-regression, and this is very useful in monitoring soil and water loss on the central Loess Plateau.