Impacts　of　Drying　on　the　Agricultural　Structure　of　North　China

It is one of subprojects of the National Basic Theoretical Research Project "The Living Environment Evolution and the Prediction Research on Drying Trend in North China." The project includes three parts:(1) the regionalization of ecological functional zones and discussions;(2) changes of water resources and their impacts on the agricultural production;(3) impacts of drying on the agricultural structure of arid or semiarid areas in North China and the corresponding countermeasures.