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This monograph is based on the results of the national water pollution control and management technology major special projects “Research on Primary and Secondary Zoning of Songhua River Basin Aqua-Ecological Functions” (Project No: 2008ZX07526-002-01) and “Research on Third and Fourth Zoning of Songhua River Basin Aqua-Ecological Functions ” ( Project No: 2012ZX07501002-01). The outcomes of this