The Sanjiang Plain is the largest and most concentrated wetland region in China, the total area is about1. 088×107ha with rich marsh resources and biodiver
Hydrologic features, load of main pollutants and current condition of water quality in Lingdingyang Estuary are discussed by references and monitoring data. Aff
Based on development level of regional societye and economy, the paper attempts oto analyze the present situation, types and change of regional environment in China through the definition of four con