Types and Changes of Ecological Control Policies in 1983－2017 in Yanchi，Ningxia，China: A Perspective from Policy Instruments

Jie Liao, CAREERI/CAS Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, China and Xia Cuizhen, northwest institute of Eco-environment and resources, desert and desertification division, Lanzhou, China
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