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The article discusses a study on the measurement of soil nitrogen (N) under sandy Mongolian pine plantations of different ages and management practices using the ion exchange resin bag method. It cites the study area situated in the southeast Keerqin sandy lands and the study plots chosen in Zhanggutai Twon of Zhangwu County, Liaoning Province. It notes grassland as the best option for ecological restoration and suggests more study on the influence of grazing on soil N availability after afforestation.