grassland establishment pattern and comprehensive profit in ecotone of pastures and farm lands in North ChinaA case study of Maerzhuang of Yanchi County in Ningxia Hui Autonomous Region

In order to choose proper grassland establishment patterns in ecotone of pastures and farm lands in North China with quality forage planting watersaving irrigation demonstration project area at Maerzhuang of Yanchi County as the research object， the costbenefit comparison of four types of grasslands, including natural grasslands (NG), Medicago sativa grassland (ML), Glycyrrhiza uralensis grassland (GL) and M.sativaG.uralensis mixed grassland (M+G), on soil moisture, nutrient status and dynamics were studied by using grey correlation analysis methods. The results showed that the order of water contents in different land types was M+GMLGLNG; the pros and cons of the trend of water was GLM+GNGML; the order of soil nutrient status was GLMLNGM+G; and the trend of soil nutrient status was GLMLNGM+G. The soil nutrient trend of M+G became worse gradually, but that of other three treatments was similar, and the pattern of the change was following with increasing-decreasing-increasing. The order of economicbenefit of four kinds of grasslands was GLMLM+GNG. It could be concluded that GL was the best pattern in the four grassland establishment patterns from the comprehensive profit point view.