Effect of Unrestricted Nitrogen and Irrigation Application on Soil Carbon and Nitrogen Pools in Greenhouse Vegetable Systems

摘要

In the north China plain, the amount of N fertilizer and irrigation application in greenhouse vegetable systems is about three to five times that in conventional cereal systems. Over a decade of shifting from the conventional cereal systems to greenhouse vegetables, the capacity for nutrient cycling within these greenhouse systems has fallen. Additionally, the content of inorganic C in the soil profile under greenhouse systems has shown a dramatic decline.