珠江三角洲鱼塘养殖区域生态环境恶化珠江三角洲鱼塘养殖区面积达６万公顷，约占耕地面积的７５％。自１９８５年以来，该鱼塘养殖区生态环境逐步恶化，塘水多偏酸性，总氮、磷和有机悬浮物含量普遍超标，塘水呈富营养化。塘泥内也含有较多的有机质、营养盐以及硫化物等有... Ecological environment deterioration in fish pond culture area in the Pearl River Delta The fish pond aquaculture area in the Pearl River Delta has an area of ​​60,000 hectares, accounting for about 75% of the cultivated area. Since 1985, the ecological environment of the fish pond farming area has gradually deteriorated. The pond water is more acidic, the total nitrogen, phosphorus and organic suspended matter content are generally exceeded, and the pond water is eutrophic. Pond mud also contains more organic matter, nutrients and sulfides and so on ...