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{'由于人口增加和工农业生产的发展,人类赖以生存的淡水生态系统日益退化,特别是富营养化问题,已严重威胁社会经济的持续发展和人类健康.如何在强污染负荷下修复水生态系统具有重大理论和现实意义.本文总结了自1990年以来在淡水湖泊中进行的物理生态工程(Physico': [0], 'EcologicalEngineering,PEEN)实验研究实践.主要结论为:(1)地表水环境治理的主要目标是修复为稳定健康的水生态系统;(2)主要方法是与污染源治理相结合实践物理生态工程(PEEN)和生物环保产业(Bio': [1], 'EnvironmentalEnterprise,BEE);(3)实现目标的主要途径是星火燎原,从局部到大范围乃至全流域;(4)实现目标的主要关键是抓住四个环节(4M):高等水生植物(Macrophyte),宏观仿生学(Macro': [2], 'bioimitation),微生物(Microorganism),及管理(Management);(5)山清水秀,人杰地灵,社会经济生态协调发展的美好未来有可能在不远的将来实现.;Being': [3], 'the': [4, 21, 69, 98, 125, 139, 162, 167, 177, 202, 215, 222, 231, 238, 252, 259], 'basis': [5], 'of': [6, 14, 20, 100, 104, 120, 141, 153, 166, 188], 'human': [7], 'society,': [8], 'freshwater': [9], 'aqua-ecosy': [10], 'stem': [11, 169], 'is': [12, 138, 150, 205, 240], 'suffering': [13], 'gradual': [15], 'degradation': [16], 'in': [17, 29, 34, 68, 76, 84, 113, 172, 185, 287], 'many': [18, 63], 'regions': [19], 'world.Most': [22], 'fresh': [23, 186], 'water': [24, 60, 108, 147], 'lakes': [25], 'and': [26, 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