The Three-North Shelter Forest is located in northern China. Construction began in 1979, and it has been 40 years since it has played a significant role in improving the ecology. However, due to the long construction period of the Three-North Shelter Forest, the initial stage was trapped by the wrong choice of tree species for economic benefits, etc., the shelter forest in many places has experienced an obvious decrease, which makes the function of the shelter forest decline. We demonstrated this through data collection and graphing and found that the most degraded area of The Three-North Shelter Forests is located in Heilongjiang Province, China, including Qiqihar, Daqing and
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