PROGRESS IN GEOGRAPHY ›› 2010, Vol. 29 ›› Issue (5): 530-534.doi: 10.11820/dlkxjz.2010.05.003

• Original Articles • Previous Articles     Next Articles

Topographic Differentiation Simulation of Alfalfa Yield and Soil and Water Loss in the Loess Plateau

YANG Bo1,2, XU Yong1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2010-01-01 Revised:2010-03-01 Online:2010-05-25 Published:2010-05-25

Abstract:

De-farming slope farmland has been an effective measure in recent years for the improvement of the eco-environment and the mitigation of soil and water loss in the Loess Plateau. This paper, taking the Yangou Basin as a case study and using the day-by-day meteorological data from Yan’an station in 2006, simulated and analyzed the quantitative relation between alfalfa straw yield, soil and water loss and topographic condition with the aid of WIN-YIELD software. The results show that: a) Topographic gradient has important influences on straw yield and sediment loss in the Loess Plateau. The bigger the gradient is, the lower the straw yield and the more sediment loss will be. b) The straw yield, when the alfalfa is planted below an elevation of 1000 m, is significantly higher than that over 1000 m. Changes of soil and water losses with topographic height on slope farmland are not significant. c) Topographic slope aspect has little effect on the straw yield and soil and water loss.

Key words: alfalfa, simulation of topographic differentiation, slope farmland, soil and water loss, the Loess Plateau