The Songnen plain, rich in water and grass a century ago, is one of the biggest plains in China. Since the middle of the 20th century,agriculture and stock raising have been increased rapidly, and it had been built important industry base of energy sources. The land desertification, salinization, and grass degradation had been serious problems as the population increasing and economy developing, and many areas even had changed into slick spot of exposed salina. Based on the evolution of the geological histo...
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